Post by thread:[PICLIST] weather station

I remember somebody mentioning they had built a weather station, but I don't know who. If you are out there please contact me as I am thinking of building one myself. ASH - UK -

I have received some private e-mail about meteorological calculations and other info so I updated my `pathetic' little web site with a variety of links which include: - Common Meteorological Calculations - The Weather Calculator - Calculate Weather On-Line - Federal Meteorological Handbook No. 1 - Surface Weather Observations and Reports - National Oceanic and Atmospheric Administration (NOAA) - National Weather Service (NWS) - American Meteorological Society (AMS) - World Meteorological Organization (WMO) - AccuWeather - Weather Forecasts, RADAR Data, and Satellite Imagery from Around the World - The Weather Underground - Forecasts, Maps, RADAR, Satellite, Weather Cams, and Software - UM Weather - Forecasts, Maps, RADAR, Satellite, Weather Cams, and Software - Davis Instruments Weather Stations - Peet Bros. Weather Stations - Fascinating Electronics Weather Stations and Kits - Build Dallas Semiconductor's Weather Station based on their 1-Wire Interface - Build a Weather Station using the PIC or BASIC Stamp. By Peter Anderson - Build The WeatherStamp Meteorological Station Kit - Build an Anemometer For more info: http://www.teleport.com/~thandley/Wilbure.htm - Tom ------------------------------------------------------------------------ Tom Handley New Age Communications Since '75 before "New Age" and no one around here is waiting for UFOs ;-)

ok, how the &Û%&Û% does it tell what direction the wind is comming from ? >From the rotation of the 'wind-wheel' it can only determine windspeed, not direction ?!? (north/west/south/east and so on) > - Build a Weather Station using the PIC or BASIC Stamp. By Peter Anderson > - Build The WeatherStamp Meteorological Station Kit > - Build an Anemometer > > For more info: > > http://www.teleport.com/~thandley/Wilbure.htm > > Tom Handley

Yes, you can. In real, the rotating sensor is made of 3 or 4 arms and cups. If the rotator generates one pulse per arm, and if one of the cups is bigger than the others, you can measure a small time difference between pulses, the time from certain pulse to another will be short, this happens when the bigger cup is being pushed by the wind. If you install another sensor (one pulse per revolution) in the rotator that identify a know position (home position), it would be easy to identify in percentage (from 0 to 100% of a complete rotor revolution), so the direction of the wind with great accuracy. The only problem is that the rotator would vibrate, as out of balance, extra adjustments with weights could be necessary. Patrick J wrote: > > ok, how the &Û%&Û% does it tell what direction the wind is comming from ? > >From the rotation of the 'wind-wheel' it can only determine windspeed, > not direction ?!? (north/west/south/east and so on)

hmm, yes w some modification it should be possible to do as u describe. (pretty smart actually!) But i was looking at that construction on that site and could not figure out how the wind-direction was measured... It seems to have a simple rotary sensor and no other stuff to detect it with. ------ Yes, you can. In real, the rotating sensor is made of 3 or 4 arms and cups. If the rotator generates one pulse per arm, and if one of the cups is bigger than the others, you can measure a small time difference between pulses, the time from certain pulse to another will be short, this happens when the bigger cup is being pushed by the wind. If you install another sensor (one pulse per revolution) in the rotator that identify a know position (home position), it would be easy to identify in percentage (from 0 to 100% of a complete rotor revolution), so the direction of the wind with great accuracy. The only problem is that the rotator would vibrate, as out of balance, extra adjustments with weights could be necessary. > ok, how the &Û%&Û% does it tell what direction the wind is comming from ? > >From the rotation of the 'wind-wheel' it can only determine windspeed, > not direction ?!? (north/west/south/east and so on)

Wagner Lipnharski wrote: > If you install another sensor (one pulse per revolution) in the > rotator that identify a know position (home position), No, you only need one sensor. The "chopper" blade is longer for one of the cups so the processor can figure out which cup is which. -- Cheers, Paul B.

Yup, you mean one slot aperture is wider, so the processor would know when the larger cup is crossing the sensor... works. The longer pulse means home position, the shorter period between pulses would say when the big cup is facing the wind. The angular position between them would tell the wind angle related to the sensor physical position. "Paul B. Webster VK2BZC" wrote: {Quote hidden}> > Wagner Lipnharski wrote: > > > If you install another sensor (one pulse per revolution) in the > > rotator that identify a know position (home position), > > No, you only need one sensor. The "chopper" blade is longer for one > of the cups so the processor can figure out which cup is which. > -- > Cheers, > Paul B.

Hi there I'm trying to build a weather station for my design project could you please help me out in terms of what kind of PIC microcontrollers should I use for the project. This is for my senior design project so your quick response will be appreciated. thanks Mothusi -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use spam_OUTlistservTakeThisOuTmitvma.mit.edu?body=SET%20PICList%20DIGEST>

How many sensors do you want to have? Do you require 8-bit or 12-bit accuracy? will it use mains power or battery? what resources for programming the chip are available? do you want it fast, cheap, or simple? The Microchip Embedded Design seminar (2000) had a weather station for one example, maybe this would give you some ideas. alice {Quote hidden}> Hi there I'm trying to build a weather station for my design project could > you please help me out in terms of what kind of PIC microcontrollers should I > use for the project. This is for my senior design project so your quick > response will be appreciated. > thanks > > Mothusi > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > use .....listservKILLspam@spam@mitvma.mit.edu?body=SET%20PICList%20DIGEST -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use listservKILLspammitvma.mit.edu?body=SET%20PICList%20DIGEST>

Hi, High school or college? What are you planning on monitoring with your weather station? What kind of display, recording, reporting features are you planning? How will you power your station (line or battery)? Regards, Dave Alina Mothusi wrote: {Quote hidden}> > Hi there I'm trying to build a weather station for my design project could > you please help me out in terms of what kind of PIC microcontrollers should I > use for the project. This is for my senior design project so your quick > response will be appreciated. > thanks > > Mothusi > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > use .....listservKILLspam.....mitvma.mit.edu?body=SET%20PICList%20DIGEST -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use EraseMElistservspam_OUTTakeThisOuTmitvma.mit.edu?body=SET%20PICList%20DIGEST>

If you use pre-built data collecting heads your project can concentrate on the processing and display of the data. Over 20 years ago the National Marine Electronics Association (of America) devised and published a (voluntary) standard for navigational instrumentation communication on boats called NMEA 0180. Pre-built masthead units that continually output wind speed and direction and pre-built temperature, pressure and humidity units for NMEA 0180 are commonly available. The data is sent (one way) as plain ASCII in comma delineated lists with a source and data type identifying header and a trailing check sum in RS422 format at 4800 (or on newer units, 9600) baud. Concentrator units typically combine data from 3 or 4 sending units into a single stream for processing/display. As no message is allowed to be bigger than 80 bytes and check sums are used then any overlapping data (collision) can easily be rejected. One half of the RS422 and the power ground can be used to read the data stream as RS232 if noise on the data lines is not a problem. For a school project it will probably be better to reduce the scope of the project to just the bottom end (processing and display), leaving the data gathering hardware engineering to people with more than 20 year's experience. Second hand NMEA 0180 weather collectors could be cheaper than buying the parts to *TRY* to build them yourself. Just some thoughts. Bye. {Original Message removed}

This link has sensors for weather stations. http://www.columbia-center.org/fascinating/obs/observer.html You can also find some info on setting up PIC and STAMP weather stations @ http://www.phanderson.com/stamp/wx_index.html ----- Original Message ----- From: "Gennette, Bruce" <bruce.gennettespam_OUTTAFE.NSW.EDU.AU> To: <@spam@PICLISTKILLspamMITVMA.MIT.EDU> Sent: Tuesday, September 12, 2000 3:27 PM Subject: Re: weather station > If you use pre-built data collecting heads your project can concentrate on > the processing and display of the data. -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use KILLspamlistservKILLspammitvma.mit.edu?body=SET%20PICList%20DIGEST>

Hi Dave its for a college project. I was thinking of having humidity, pressure, temperature and possibly wind speed sensors and have them store and output data through a microcontroller. The Kind of display could be on an LCD or just regular computer. I want it to be a standalone station so I'd use a battery to provide the power. I have never programmed any PIC chip before but I have programmed an EPROM AMD chip before using data I/O unisite machine, with some software called synario. Thats all I know for now. Regards, Mothusi In a message dated Tue, 12 Sep 2000 6:11:49 PM Eastern Daylight Time, David Minkler <RemoveMEMinkTakeThisOuTLUXTRON.COM> writes: << Hi, High school or college? What are you planning on monitoring with your weather station? What kind of display, recording, reporting features are you planning? How will you power your station (line or battery)? Regards, Dave Alina Mothusi wrote: {Quote hidden}> > Hi there I'm trying to build a weather station for my design project could > you please help me out in terms of what kind of PIC microcontrollers should I > use for the project. This is for my senior design project so your quick > response will be appreciated. > thanks > > Mothusi > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > use spamBeGonelistservspamBeGonemitvma.mit.edu?body=SET%20PICList%20DIGEST -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use TakeThisOuTlistservEraseMEspam_OUTmitvma.mit.edu?body=SET%20PICList%20DIGEST> >> -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use RemoveMElistservTakeThisOuTmitvma.mit.edu?body=SET%20PICList%20DIGEST>

Hi, My senior project was a radiation based random number generator. A fair portion of my background is in high voltage power supplies (x-ray to 200kV) so the 900 volt supply for the Geiger tube was easy. I used two PIC16C77s. One handled data logging/management and the other handled user interface. My advisor was a specialist in multi-processor architectures so I thought I'd get extra consideration for attacking a multi-processor project. Probably helped a little. I didn't want to fight with programming hardware so I used a Picstart Plus. I also used the CCS compiler. Had a few problems there but nothing I couldn't work around. The price/performance ratio was almost exactly what I needed. They have built in libraries for driving the simple LCD's we typically use in these projects that probably saved me a couple of weeks of development time. Several of the list members offer very inexpensive or free compilers and programming hardware. If you have a highly limited budget you might try them. For a senior project you are going to get *lots* of extra points for an on schedule completion and for a clean/solid presentation. Get it done! Don't fight with limited hardware capabilities on a onesie project. Pick a controller with substantially more capabilities than you really need. I liked the 16C77s and wound up using a lot of the built in features. I would recommend something at that level. It's well supported, readily available and very inexpensive. In order of difficulty your sensors will likely be temperature, pressure, wind speed and humidity. Temperature and pressure are straight A/D interfaces with off the shelf sensors and a minimum of signal conditioning. Wind speed can be done in a variety of ways some of which are projects in themselves. I don't know much about the current state of the art in humidity sensors but I remember humidity being tougher to do than it looks. Incidentally, my project blew the doors off of everything else that was concurrently presented and they use it as an example of *how it's done* now. Good luck with your project and don't be shy about asking the list for help. That's what it's here for. Best regards, Dave Minkler Alina Mothusi wrote: {Quote hidden}> > Hi there I'm trying to build a weather station for my design project could > you please help me out in terms of what kind of PIC microcontrollers should I > use for the project. This is for my senior design project so your quick > response will be appreciated. > thanks > > Mothusi > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > use listservEraseME.....mitvma.mit.edu?body=SET%20PICList%20DIGEST -- http://www.piclist.com hint: To leave the PICList EraseMEpiclist-unsubscribe-requestmitvma.mit.edu>

Hello David, Wednesday, September 13, 2000, 18:21:49, you wrote: DM> Wind speed can be done in a variety of ways some DM> of which are projects in themselves. The best way to measure wind speed (I think) is to use a small DC motor with the manometer attached to the axle. The faster the motor turns the higher the voltage generated. So effectively you've turned a motor into a reasonably linear generator. A simple 8bit ADC should be fast enough, although it might be worth getting one which supports sample and hold as the value will change rapidly. So use a cheap ADC for temperature and pressure and probably a FLASH ADC for wind speed. Sorry I can't help with humidity. -- From Jamie Dainton Thursday, September 14, 2000 08:35:05 The Bat! 1.46 Beta/5 Windows 98 4.10 2222 RemoveMEpgpEraseMEEraseMEdainton.org.uk?subject=sendKey -- http://www.piclist.com hint: PICList Posts must start with ONE topic: "[PIC]:" PIC only "[EE]:" engineering "[OT]:" off topic "[AD]:" ad's

Were I in your shoes I would choose one of the 16f8xx chips. Which one to you depends on several factors: How many and what type of input How many and what type of output Amount of processing needing to be performed on the processor Inputs to my weatherstation would be: Humidity (analog, or maybe one digital pin timing how long it takes to charge a capacitive element in the sensor) Pressure (analog) Temperature (one or two digital lines with a network of digital sensors) Wind direction (analog(1) or digital(4)) Wind speed (digital) Rain guage (digital) 4-8 buttons for user interface (4-6 digital) Perhaps a small radio tune to an emergency weather broadcast channel, decoded digitally (1 digital) Outputs from my weatherstation would be: LCD (6 to 12 digital lines) RS-232 (2 digital, also use this for firmware updates) Sound for alarm conditions (1 digital) one or two LEDs (2 digital, more if multi-color) I would rather cable one two or three wire cable from the base to the instrument tower, so I would need one PIC in each location, with one digital pin on each pic dedicated to communicating with each other. The tower requires: Analog in: 1-3 Digital in/out: 4-10 Minimal processing The base station requires: Digital in/out: 16-24 Medium processing Of course I would start out with only one processor, get everything going, then split it up. But at this point the PIC16F870 would fulfill all of the above conditions. I hope this helps! -Adam Alina Mothusi wrote: {Quote hidden}> > Hi there I'm trying to build a weather station for my design project could > you please help me out in terms of what kind of PIC microcontrollers should I > use for the project. This is for my senior design project so your quick > response will be appreciated. > thanks > > Mothusi > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > use RemoveMElistservspam_OUTKILLspammitvma.mit.edu?body=SET%20PICList%20DIGEST -- http://www.piclist.com hint: PICList Posts must start with ONE topic: "[PIC]:" PIC only "[EE]:" engineering "[OT]:" off topic "[AD]:" ad's

Alina Mothusi wrote: >> >> Hi there I'm trying to build a weather station for my design project could >> you please help me out in terms of what kind of PIC microcontrollers should I >> use for the project. This is for my senior design project so your quick >> response will be appreciated. >> Adam Davis wrote: >Were I in your shoes I would choose one of the 16f8xx chips. Which one to you >depends on several factors: ........... > >Of course I would start out with only one processor, get everything going, then >split it up. But at this point the PIC16F870 would fulfill all of the above >conditions. > Hello Alina, Adam gave some good advice here. However, I think I would add one additional thought. If you are new to microcontrollers and especially to PICs, I would strongly recommend starting out with the 18-pin PIC16F84 chip. It is easy and quick to program and re-program, will introduce you to the basic PIC architecture and instruction set, and, most importantly, does not have all of the complex peripherals to worry about - SPI, I2C, A/D converters, PWM, etc. There seem to be a lot of people entering piclist, who say things like "I have never programmed a micrcontroller before, but I want to use the 16F877 to do [such and so] a project". I think it is a bad mistake to start off in PICs at this level. A beginner should not have to even be in the same playing field as multiple code pages and data banks, complex memory maps, and problems that crop up with programming peripheral subsystems [and which, incidentally, occupy a large percentage of piclist discussion bandwidth]. It is much better to start with the simpler chips, learn the basics well, and then move to the more complex chips when the time is right. Graded progression. This, of course, is exactly the same strategy you have just been thru over four years of schooling. Algebra -> calculus -> diffeq -> complex numbers -> multi-dimensional field theory. hope this helps, - Dan Michaels Oricom Technologies http://www.sni.net/~oricom ========================== -- http://www.piclist.com hint: PICList Posts must start with ONE topic: "[PIC]:" PIC only "[EE]:" engineering "[OT]:" off topic "[AD]:" ad's

Dan Michaels wrote: {Quote hidden}> > Alina Mothusi wrote: > >> > >> Hi there I'm trying to build a weather station for my design project could > >> you please help me out in terms of what kind of PIC microcontrollers should I > >> use for the project. This is for my senior design project so your quick > >> response will be appreciated. > >> > > Hello Alina, > > Adam gave some good advice here. However, I think I would add one > additional thought. > > If you are new to microcontrollers and especially to PICs, I would > strongly recommend starting out with the 18-pin PIC16F84 chip. > It is easy and quick to program and re-program, will introduce > you to the basic PIC architecture and instruction set, and, > most importantly, does not have all of the complex peripherals > to worry about - SPI, I2C, A/D converters, PWM, etc. > > There seem to be a lot of people entering piclist, who say things > like "I have never programmed a micrcontroller before, but I want > to use the 16F877 to do [such and so] a project". I think it is a > bad mistake to start off in PICs at this level. > > A beginner should not have to even be in the same playing field > as multiple code pages and data banks, complex memory maps, and > problems that crop up with programming peripheral subsystems > [and which, incidentally, occupy a large percentage of piclist > discussion bandwidth]. > > It is much better to start with the simpler chips, learn the > basics well, and then move to the more complex chips when the > time is right. Graded progression. This, of course, is exactly > the same strategy you have just been thru over four years of > schooling. Algebra -> calculus -> diffeq -> complex numbers > -> multi-dimensional field theory. > > hope this helps, > - Dan Michaels I absolutely agree Dan, the 877 looks very powerful and enticing to a beginner, but would be a nightmare to someone who is not very familiar with PICs, even the humble(!) 16F84 has a lot of options that stumble the beginner, always seeing beginner problems re watchdog timer left on, int handlers, osc settings, PCLATH, etc etc. Even the RISC instructions (which I like) but not always instinctive even to someone who may be familiar with assembler on say a motorola style chip. Best advice for a PIC beginner would be to start with a 16F84, code each part of the big app one by one, test it on the 84, at least they only have to wait 17 secs to program it, not 2 mins every time. Even the simpler 84 will cause some complex issues. Once they have most of the code pieces working they can transfer to the larger chip and deal with the next problems, ie, code pages and super-complex peripheral modules. Roman -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

>If you are new to microcontrollers and especially to PICs, I would >strongly recommend starting out with the 18-pin PIC16F84 chip. >It is easy and quick to program and re-program, will introduce >you to the basic PIC architecture and instruction set, and, >most importantly, does not have all of the complex peripherals >to worry about - SPI, I2C, A/D converters, PWM, etc. Starting with flash (electricaly reprogrammable) chip is definitly a plus. The 16F87x can even reprogram itself (downloaders available from several places), which counts as another plus on top of being flash. But I would disagree that SPI, I2C, A/D... make the chip more difficult to work with. You needn't use the peripherals, they are switched off on power up and the pins work as regular ports. With one exception - PORTA is all analog inputs, ADCON1 has to be set to 0x07. And the peripherals are there when you need them. More program pages - no problem. As long as you stay at page 0, you needn't care. At the time your program exceeds 2K boundary (and MPASM will tell you that), you have likely earned enough expertise to deal with PCLATH. My $0.02. Josef -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

Roman Black wrote: >Dan Michaels wrote: ............. >> If you are new to microcontrollers and especially to PICs, I would >> strongly recommend starting out with the 18-pin PIC16F84 chip. .............. > >I absolutely agree Dan, the 877 looks very powerful and enticing to >a beginner, but would be a nightmare to someone who is not very >familiar with PICs, even the humble(!) 16F84 has a lot of options >that stumble the beginner, always seeing beginner problems re >watchdog timer left on, int handlers, osc settings, PCLATH, etc etc. ................ Gosh, after almost a year on piclist, I finally got someone to agree with me on something. I am overwhelmed - [just kidding]. On my first job - at Lockheed Sunnyvale - they were waltzing us new engineers around showing us various departments and programs. Space frame, power systems, guidance systems, comm systems, "special programs", on and on. Power systems - gakk! Of course, we all wanted special programs - didn't even know what it was - he, he. best regards, - dan -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

Josef @Snail wrote: {Quote hidden}>>If you are new to microcontrollers and especially to PICs, I would >>strongly recommend starting out with the 18-pin PIC16F84 chip. >>It is easy and quick to program and re-program, will introduce >>you to the basic PIC architecture and instruction set, and, >>most importantly, does not have all of the complex peripherals >>to worry about - SPI, I2C, A/D converters, PWM, etc. > >Starting with flash (electricaly reprogrammable) chip is definitly a plus. >The 16F87x can even reprogram itself (downloaders available from several >places), which counts as another plus on top of being flash. > >But I would disagree that SPI, I2C, A/D... make the chip more difficult to >work with. You needn't use the peripherals, they are switched off on power >up and the pins work as regular ports. With one exception - PORTA is all >analog inputs, ADCON1 has to be set to 0x07. And the peripherals are there >when you need them. > >More program pages - no problem. As long as you stay at page 0, you needn't >care. At the time your program exceeds 2K boundary (and MPASM will tell you >that), you have likely earned enough expertise to deal with PCLATH. > >My $0.02. > Josef, were you able to jump right in to the '87x as your very first microcontroller, or did you kind of work your way up to it? If you jumped right in, did your head not spin around at least a couple of times, before you got it all figured out? -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

Thanks Adams I certainly will consider all that and I should give you an update as time goes on. In a message dated Thu, 14 Sep 2000 8:51:19 AM Eastern Daylight Time, "M. Adam Davis" <RemoveMEadavisTakeThisOuTspamUBASICS.COM> writes: << Were I in your shoes I would choose one of the 16f8xx chips. Which one to you depends on several factors: How many and what type of input How many and what type of output Amount of processing needing to be performed on the processor Inputs to my weatherstation would be: Humidity (analog, or maybe one digital pin timing how long it takes to charge a capacitive element in the sensor) Pressure (analog) Temperature (one or two digital lines with a network of digital sensors) Wind direction (analog(1) or digital(4)) Wind speed (digital) Rain guage (digital) 4-8 buttons for user interface (4-6 digital) Perhaps a small radio tune to an emergency weather broadcast channel, decoded digitally (1 digital) Outputs from my weatherstation would be: LCD (6 to 12 digital lines) RS-232 (2 digital, also use this for firmware updates) Sound for alarm conditions (1 digital) one or two LEDs (2 digital, more if multi-color) I would rather cable one two or three wire cable from the base to the instrument tower, so I would need one PIC in each location, with one digital pin on each pic dedicated to communicating with each other. The tower requires: Analog in: 1-3 Digital in/out: 4-10 Minimal processing The base station requires: Digital in/out: 16-24 Medium processing Of course I would start out with only one processor, get everything going, then split it up. But at this point the PIC16F870 would fulfill all of the above conditions. I hope this helps! -Adam Alina Mothusi wrote: {Quote hidden}> > Hi there I'm trying to build a weather station for my design project could > you please help me out in terms of what kind of PIC microcontrollers should I > use for the project. This is for my senior design project so your quick > response will be appreciated. > thanks > > Mothusi > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > use EraseMElistservspamspamBeGonemitvma.mit.edu?body=SET%20PICList%20DIGEST -- http://www.piclist.com hint: PICList Posts must start with ONE topic: "[PIC]:" PIC only "[EE]:" engineering "[OT]:" off topic "[AD]:" ad's >> -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

Thanks Dave, I sure would consider your advice. I'm actually going to buy a development board to test the functions of the microcontroller. I am still not knowledgeable enough to say this is what or not, but from what I got 16f8XX are highly recommedable for this project. I will keep you posted, this week I have to do an economic analysis and first presentation. regards, Mothusi In a message dated Wed, 13 Sep 2000 1:23:21 PM Eastern Daylight Time, David Minkler <RemoveMEMinkKILLspamLUXTRON.COM> writes: << Hi, My senior project was a radiation based random number generator. A fair portion of my background is in high voltage power supplies (x-ray to 200kV) so the 900 volt supply for the Geiger tube was easy. I used two PIC16C77s. One handled data logging/management and the other handled user interface. My advisor was a specialist in multi-processor architectures so I thought I'd get extra consideration for attacking a multi-processor project. Probably helped a little. I didn't want to fight with programming hardware so I used a Picstart Plus. I also used the CCS compiler. Had a few problems there but nothing I couldn't work around. The price/performance ratio was almost exactly what I needed. They have built in libraries for driving the simple LCD's we typically use in these projects that probably saved me a couple of weeks of development time. Several of the list members offer very inexpensive or free compilers and programming hardware. If you have a highly limited budget you might try them. For a senior project you are going to get *lots* of extra points for an on schedule completion and for a clean/solid presentation. Get it done! Don't fight with limited hardware capabilities on a onesie project. Pick a controller with substantially more capabilities than you really need. I liked the 16C77s and wound up using a lot of the built in features. I would recommend something at that level. It's well supported, readily available and very inexpensive. In order of difficulty your sensors will likely be temperature, pressure, wind speed and humidity. Temperature and pressure are straight A/D interfaces with off the shelf sensors and a minimum of signal conditioning. Wind speed can be done in a variety of ways some of which are projects in themselves. I don't know much about the current state of the art in humidity sensors but I remember humidity being tougher to do than it looks. Incidentally, my project blew the doors off of everything else that was concurrently presented and they use it as an example of *how it's done* now. Good luck with your project and don't be shy about asking the list for help. That's what it's here for. Best regards, Dave Minkler Alina Mothusi wrote: {Quote hidden}> > Hi there I'm trying to build a weather station for my design project could > you please help me out in terms of what kind of PIC microcontrollers should I > use for the project. This is for my senior design project so your quick > response will be appreciated. > thanks > > Mothusi > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > use listservSTOPspamspam_OUTmitvma.mit.edu?body=SET%20PICList%20DIGEST -- http://www.piclist.com hint: To leave the PICList spamBeGonepiclist-unsubscribe-requestSTOPspamEraseMEmitvma.mit.edu> >> -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

Thanks Josef for your help. In a message dated Fri, 15 Sep 2000 8:26:09 AM Eastern Daylight Time, Snail Instruments <KILLspamsnailspamBeGoneIOL.CZ> writes: << >If you are new to microcontrollers and especially to PICs, I would >strongly recommend starting out with the 18-pin PIC16F84 chip. >It is easy and quick to program and re-program, will introduce >you to the basic PIC architecture and instruction set, and, >most importantly, does not have all of the complex peripherals >to worry about - SPI, I2C, A/D converters, PWM, etc. Starting with flash (electricaly reprogrammable) chip is definitly a plus. The 16F87x can even reprogram itself (downloaders available from several places), which counts as another plus on top of being flash. But I would disagree that SPI, I2C, A/D... make the chip more difficult to work with. You needn't use the peripherals, they are switched off on power up and the pins work as regular ports. With one exception - PORTA is all analog inputs, ADCON1 has to be set to 0x07. And the peripherals are there when you need them. More program pages - no problem. As long as you stay at page 0, you needn't care. At the time your program exceeds 2K boundary (and MPASM will tell you that), you have likely earned enough expertise to deal with PCLATH. My $0.02. Josef -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics >> -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

Yep, I think I will bump into problems but somehow I'll manage. In a message dated Fri, 15 Sep 2000 2:02:00 PM Eastern Daylight Time, Dan Michaels <EraseMEoricomEraseMELYNX.SNI.NET> writes: << Josef @Snail wrote: {Quote hidden}>>If you are new to microcontrollers and especially to PICs, I would >>strongly recommend starting out with the 18-pin PIC16F84 chip. >>It is easy and quick to program and re-program, will introduce >>you to the basic PIC architecture and instruction set, and, >>most importantly, does not have all of the complex peripherals >>to worry about - SPI, I2C, A/D converters, PWM, etc. > >Starting with flash (electricaly reprogrammable) chip is definitly a plus. >The 16F87x can even reprogram itself (downloaders available from several >places), which counts as another plus on top of being flash. > >But I would disagree that SPI, I2C, A/D... make the chip more difficult to >work with. You needn't use the peripherals, they are switched off on power >up and the pins work as regular ports. With one exception - PORTA is all >analog inputs, ADCON1 has to be set to 0x07. And the peripherals are there >when you need them. > >More program pages - no problem. As long as you stay at page 0, you needn't >care. At the time your program exceeds 2K boundary (and MPASM will tell you >that), you have likely earned enough expertise to deal with PCLATH. > >My $0.02. > Josef, were you able to jump right in to the '87x as your very first microcontroller, or did you kind of work your way up to it? If you jumped right in, did your head not spin around at least a couple of times, before you got it all figured out? -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics >> -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

Alina, I have a lot of experience at this. I designed a PIC-based weather station that has been running for six years. It's an overkill as I also added security, alarm, and energy-management functions. If I had to do it all over again, I would do a modified version of the Dallas 1-wire weather station. For more information on that, other kits, and a wealth of meteorological links, check my web site: http://www.teleport.com/~thandley/Wilbure.htm - Tom Alina Mothusi wrote: > > Hi there I'm trying to build a weather station for my design project could > you please help me out in terms of what kind of PIC microcontrollers should I > use for the project. This is for my senior design project so your quick > response will be appreciated. > thanks > > Mothusi ------------------------------------------------------------------------ Tom Handley New Age Communications Since '75 before "New Age" and no one around here is waiting for UFOs ;-) -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

Hi! [Sorry if this is a duplicate, but it seems the first one didn4t go out] I own a Davis Perception II weather station. It can be connected to a RS232 port, not directly but using a box called DataLogger. I found in Davis web page a reference for the RS232 side, but I would like to connect a PIC directly to the station. Does anyone knows the protocol that this weather station speaks? Thanks, Diego. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

I dug up some info on the Davis WeatherMonitor protocol that someone else gave me almost ten years ago, maybe it will help. I've never tried it myself so I have no idea if it works. ======================================================================= The instrument does not use RS-232 signal levels they are TTL level. To get current readings send "LOOP + 0xFF + 0xFF + 0x0D" (7 bytes) @ 2400baud, no parity, 8 data bits, 1 stop bit. The WxMonitor responds with 19 bytes of data that are: Byte(s) Value 1 always 6 2 always 1 3 + 4 indoor temperature * 10 5 + 6 outdoor temperature * 10 7 wind speed 8 wind direction 10 + 11 barometric pressure * 10 12 indoor %RH 13 outdoor %RH 14 rainfall in hundredths 15 unknown 16 unknown 17 unknown 18 unknown 19 unknown ======================================================================= The info I have gave no clue as to what units of measurement it spits out. Hope this helps, Paul > > I own a Davis Perception II weather station. It can be connected > to a RS232 > port, not directly but using a box called DataLogger. > > I found in Davis web page a reference for the RS232 side, but I would like > to connect a PIC directly to the station. > > Does anyone knows the protocol that this weather station speaks? -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

Does anyone make a weather station that you can access via a wifi network? -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email @spam@listserv@spam@spam_OUTmitvma.mit.edu with SET PICList DIGEST in the body

Not yet... :-) Unfortunately, Wi-Fi is pretty power hungry, so you'd have to have more than the usual small solar panel/rechargable battery setup. -Adam rad0 wrote: {Quote hidden}>Does anyone make a weather station that you can access >via a wifi network? > >-- >http://www.piclist.com#nomail Going offline? Don't AutoReply us! >email spamBeGonelistservKILLspammitvma.mit.edu with SET PICList DIGEST in the body > > > > > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email .....listservspam_OUTmitvma.mit.edu with SET PICList DIGEST in the body

You could always get one of the 433Mhz or 915Mhz wireless stations and connect the base station to a PC that does Wi-Fi. You can also get better range with a 915Mhz system. Now there's a project for that overpowered AVR Circuit Cellar contest. Can someone familiar with AVR's point me at one that 'self programs' like the PIC 16F8xx series, using the serial line? e.g. 3 wire async interface not 6 wire like the AVR kit (or 5 that PIC ICSP) uses. Robert "M. Adam Davis" wrote: {Quote hidden}> > Not yet... :-) > > Unfortunately, Wi-Fi is pretty power hungry, so you'd have to have more > than the usual small solar panel/rechargable battery setup. > > -Adam > > rad0 wrote: > > >Does anyone make a weather station that you can access > >via a wifi network? -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

What about the AtMega series - can program via bootloader - is that what you're after? RP project for that overpowered AVR Circuit Cellar contest. Can someone familiar with AVR's point me at one that 'self programs' like the PIC 16F8xx series, using the serial line? e.g. 3 wire async interface not 6 wire like the AVR kit (or 5 that PIC ICSP) uses. Robert -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

>Can someone familiar with AVR's point me at one that 'self programs' >like the PIC 16F8xx series, using the serial line? >e.g. 3 wire async interface not 6 wire like the AVR kit (or 5 that PIC >ICSP) >uses. > >Robert Check out this: http://www.atmel.com/dyn/products/param_table.asp?family_id=607&OrderBy=part_no&Direction=ASC Note that the URL needs to be un-word-wrapped. It's Atmel's parametric product search for the AVR, and the second-to-last column (towards the right side of the screen) is "Self-Program Memory". Handy little chart. Mike H. _________________________________________________________________ Lose those love handles! MSN Fitness shows you two moves to slim your waist. http://fitness.msn.com/articles/feeds/article.aspx?dept=exercise&article=et_pv_030104_lovehandles -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

I've got a 12F675 sitting here, a 2 digit 7 segment display, some optical encoder pairs (from a mouse), and DS18S120 and other misc parts. My father-in-law is always watching the weather forecasts and has thermometers outside every window. I'd like to build him a simple weather station for Christmas. Given the short time-frame, I was hoping someone could point me to plans/code to build such a beast. I figure inside and outside temp, wind-speed, and or direction possibly. Maybe even wind-chill. I dunno. Any suggestions are appreciated.

Practical electronics published one about a year ago http://www.epemag.wimborne.co.uk/downloads.html Pic met office (2003)it should be a start on the code if I remember the dallas code is in it (beware its written in tasm some weird assembler but the converters are available there also. Steve {Original Message removed}

Tachyon schrieb: > I've got a 12F675 sitting here, a 2 digit 7 segment display, some > optical encoder pairs (from a mouse), and DS18S120 and other misc parts. > > My father-in-law is always watching the weather forecasts and has > thermometers outside every window. I'd like to build him a simple > weather station for Christmas. > Given the short time-frame, I was hoping someone could point me to > plans/code to build such a beast. I figure inside and outside temp, > wind-speed, and or direction possibly. Maybe even wind-chill. > I dunno. Any suggestions are appreciated. > hey! i might help you! it sound like a funny project. i make with pics serveral years.-but not a real project.because the finnishing of it is my most problem (pcb to film an etching) let´s trie it. tobi from germany

Tachyon wrote: > I've got a 12F675 sitting here, a 2 digit 7 segment display, some > optical encoder pairs (from a mouse), and DS18S120 and other misc parts. > > My father-in-law is always watching the weather forecasts and has > thermometers outside every window. I'd like to build him a simple > weather station for Christmas. > Given the short time-frame, I was hoping someone could point me to > plans/code to build such a beast. I figure inside and outside temp, > wind-speed, and or direction possibly. Maybe even wind-chill. > I dunno. Any suggestions are appreciated. I have some BoostC source for the DS18B120 - a bit idiosyncratic as I started it before Boost contained its own 1-Wire and Dallas libraries, but I could package it up and post it if you want it. It's been used in four projects now, so I guess it's stable. -- Timothy J. Weber http://timothyweber.org

Steve Smith wrote: > Practical electronics published one about a year ago > http://www.epemag.wimborne.co.uk/downloads.html Pic met office (2003)it > should be a start on the code if I remember the dallas code is in it (beware > its written in tasm some weird assembler but the converters are available > there also. > > Steve > > {Original Message removed}

Radio shack has a cute weather station, looks like a 1-wire thing, $99. Has video and PC (USB) output

Here's some information "straight from the horse's mouth". It's an article from Sensor Magazine which was written (I believe) by techs at Maxim/Dallas Semi. http://www.maxim-ic.com/products/ibutton/weather/1wire_weather_stn.pdf It doesn't contain any code, but you can find it elsewhere on the net. There's even a book about about building/hacking a 1-Wire Weather Station. http://search.barnesandnoble.com/booksearch/isbninquiry.asp?ISBN=0470040467&pdf=y&z=y Good luck. And please keep the list updated on your progress. Andrew ________________________________________________ Get your own "800" number Voicemail, fax, email, and a lot more http://www.ureach.com/reg/tag ---- On Sat, 16 Dec 2006, Tachyon (TakeThisOuTtherealtachyon.....TakeThisOuTgmail.com) wrote: > I've got a 12F675 sitting here, a 2 digit 7 segment display, some > optical encoder pairs (from a mouse), and DS18S120 and other misc parts. > > My father-in-law is always watching the weather forecasts and has > thermometers outside every window. I'd like to build him a simple > weather station for Christmas. > Given the short time-frame, I was hoping someone could point me to > plans/code to build such a beast. I figure inside and outside temp, > wind-speed, and or direction possibly. Maybe even wind-chill. > I dunno. Any suggestions are appreciated. > --

On Sat, Dec 16, 2006 at 10:58:37PM -0600, Tachyon wrote: > I've got a 12F675 sitting here, a 2 digit 7 segment display, some > optical encoder pairs (from a mouse), and DS18S120 and other misc parts. > > My father-in-law is always watching the weather forecasts and has > thermometers outside every window. I'd like to build him a simple > weather station for Christmas. > Given the short time-frame, I was hoping someone could point me to > plans/code to build such a beast. I figure inside and outside temp, > wind-speed, and or direction possibly. Maybe even wind-chill. > I dunno. Any suggestions are appreciated. Circuit Cellar had one in the July 2006 issue.it used different hardware but had a nice discussion of the problems and may be good for ideas. Ray Warren

part 1 16335 bytes content-type:multipart/related; type="text/plain"; (decoded 7bit) This is a multi-part message in MIME format. ------=_NextPart_000_00C6_01C77D59.E5C039D0 Content-Type: text/plain; format=flowed; charset="Windows-1252"; reply-type=original Content-Transfer-Encoding: 7bit http://www.weather-display.com/index.php $US70 lifetime registration Free trial version available. Handles data from large range of waether stations plus webcams. Processes webcam data for last hour, last day etc data. Happens to be written in NZ by a Waiukuk farmer who now supports the program full time. (I found it while looking for a webcam showing Onehunga cloud conditions). ___________ Weather Display is the software to get the most from your weather station. Not only does it support a huge range of stations from all the major manufacturers but it's also stacked with features and options. 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And it's only $70US for a lifetime registration! _______________ Brian Hamilton, 2 Marshall Road, RD4, Waiuku, New Zealand Phone: +64 (0)9 2351377 Email: TakeThisOuTinfoKILLspamspamweather-display.com ------=_NextPart_000_00C6_01C77D59.E5C039D0 Content-Type: image/jpeg; name="wxbanner.jpg" Content-Transfer-Encoding: base64 Content-Location: http://www.weather-display.com/wxbanner.jpg /9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAQDAwQDAwQEBAQFBQQFBwsHBwYGBw4KCggLEA4RERAO EA8SFBoWEhMYEw8QFh8XGBsbHR0dERYgIh8cIhocHRz/2wBDAQUFBQcGBw0HBw0cEhASHBwcHBwc HBwcHBwcHBwcHBwcHBwcHBwcHBwcHBwcHBwcHBwcHBwcHBwcHBwcHBwcHBz/wAARCAA9AQMDAREA AhEBAxEB/8QAHwAAAQUBAQEBAQEAAAAAAAAAAAECAwQFBgcICQoL/8QAtRAAAgEDAwIEAwUFBAQA AAF9AQIDAAQRBRIhMUEGE1FhByJxFDKBkaEII0KxwRVS0fAkM2JyggkKFhcYGRolJicoKSo0NTY3 ODk6Q0RFRkdISUpTVFVWV1hZWmNkZWZnaGlqc3R1dnd4eXqDhIWGh4iJipKTlJWWl5iZmqKjpKWm p6ipqrKztLW2t7i5usLDxMXGx8jJytLT1NXW19jZ2uHi4+Tl5ufo6erx8vP09fb3+Pn6/8QAHwEA 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