Post by thread:[SX] Measuring Voltage

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:Hi Guys Im trying to measure voltage using analogin on an SX48 protoboard. Now I have the 2 10k resistors a 0.01uf cap (ceramic disc type) and have wired it as the example in the help file. I have changed the pin to TLL as the max voltage I want to read on the test is 2v, now I am using the below code, and then runing debug and if I click run, stuff just goes red and the "a" variable in the watch list stays at 0. Any ideas? Here is the code:

' Example program using ANALOGIN command DEVICE SX48, OSC4MHZ FREQ 4_000_000 InPin PIN RA.0 INPUT TTL OutPin PIN RA.1 OUTPUT a VAR Byte voltage var byte PROGRAM Start NOSTARTUP Start: voltage = a ANALOGIN InPin, OutPin, a, 1 WATCH a watch voltage BREAK GOTO Start END DJH (not part of code :P) ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=244365 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:DJH, Make sure you have everything connected correctly. Do you get anything besides zero using CMOS on the input pin ? Using TTL cause some side effect. Mainly that zero volts results in a positive value. And it requires a negative voltage being measured to get a zero result. Bean.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:Still the same on cmos, sometines a=1 and sometimes a=0 but is random, sometimes a=189 on startup in debug mode. double checked the coonnections, all seems ok, but RA1 does not seem to be putting out any voltage at all.

Im using a 9v supply to run the protoboard, and a regtualted psu to simulate voltage between 1-5V on cmos setting DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=244365#m244488 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:DJH, What is the voltage that you are trying measure coming from ? What values to you get if you connect to ground and Vdd ? Try different SX Pins and see if you get the same problem. Bean.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:Hi bean, the voltage at the moment is coming from a regulated variable psu.

I will try other pins DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=244365#m244664 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:do I need the break command, as in is it needed for analogin to function? or is it just part of that code?

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:ok, stupid question, when it says ground, am I right in presuming that it means just the ground of the voltage to be measured, or should that also be connected to the ground on the protoboard.

Im beginning to think the latter, as otherwise when RA1 puts out voltage, it has no ground to work with so is useless Please confirm, I feel really stupid now, this is what happens when i take a break from stuff for too long. :( DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=244365#m244667 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:DJH, Yes to need to connect the ground together. Bean.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:thank you, tried another pin, same problem.

here is my code, led is red (else statement led1) DEVICE SX48, OSC4MHZ FREQ 4_000_000 InPin PIN RA.0 INPUT CMOS OutPin PIN RA.1 OUTPUT Led1 PIN RA.2 Output Led2 PIN RA.3 Output Led3 PIN RA.4 Output a VAR Byte voltage var byte PROGRAM Start NOSTARTUP Start: led2=0 voltage = a ANALOGIN InPin, OutPin, a, 1 'WATCH a 'watch voltage if a > 102 then led3=1 else led1=1 endif 'BREAK GOTO Start END just cannot figure it out ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=244365#m244672 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:Ok using debug, it seems the output pin works, when outputing I get 4.85V from it (voltage I am trying to test is only 3.7 atm), however it seems the input is not picking anything up at all, which would means I would get a 0 result? If I put a multimetere prob at RA.0 it is always a ground, so how can it ever pick anything up? I have RA.0 connect straight to inbetween the two resistors, which is also where one of the cap legs is connected (other cap leg goes to both grounds. That sounds wrong but matches the diagram?

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:Also the voltage is not getting past the first 10k resistor I presume that the + symbols on the diagram do not mean anything other than to show the lines are connected, and not that possitive voltage should be connected to it?

Im more and more sure that this is a physical problem with my circuit, just cannot figure out where DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=244365#m244683 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJ Allen wrote:djh82uk -- "I presume that the + symbols on the diagram do not mean anything other than to show the lines are connected." ???

pic attached ANALOGIN (??) ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=244365#m244742 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:

This is what i had to go from, sorry for any confusion http://forums.parallax.com/forums/attach.aspx?a=12087 DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=244365#m244854 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJ Allen wrote:The link is no good.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:

Works ok for me on another comp, I have taken a screenshot and attatched the picture, it's the same schematic as in the manual Thanks DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=244365#m244990 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJ Allen wrote:Gosh, maybe this'll be an education for me, too. I have SX/B 1.50 / SXKey v3.2 and I cannot find an ANALOGIN listed. Is that a part of a new Rev.? "1.50" has an 8-Bit ADC (ADC8.SXB) in its Example Projects. The circuit is like yours, except that the input comes in on a third pin.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Zoot wrote:PJ -- 1.51.03 dates to Sept. 2006 and is, in my experience, *extremely* stable. I wouldn't hesitate to install it. Another user found an error in SASM that prevents more than 10 includes, but that's unrelated to SX/B.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

The latest version 1.51.03, and all issues with it are documented here http://forums.parallax.com/forums/default.aspx?f=7&m=136824 Bean ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=244365#m245138 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

The latest version 1.51.03, and all issues with it are documented here http://forums.parallax.com/forums/default.aspx?f=7&m=136824 Bean ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=244365#m245139 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJ Allen wrote:OK, fine. However, is the circuitry used to implement ANALOGIN the same as 1.50's Example Project (using 3 pins), or is it really just done with two pins?

If it is down to two pins, then perhaps my rendering (analogin.jpg) will shed some light on the subject (really don't like those ASCII-y things.) ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=244365#m245154 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:PJ Allen, The 8-bit ADC example in the help file uses the comparitor to compare the input voltage to the voltage generated from the PWM output. The analogin is a different method. It does not use the comparitor, and can use any two pins. It looks to me like both schematics you post are correct for the method being used. Bean.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:Hi PJ Yes that is how I have it connected, RA.0 going in between the 2 resistors, and also the one leg of the cap, my cap says it's a 104 or 103, and my resistors are 10k, but this is where I see a problem, 4.8V say through a 100k resistor, shows as 0v at the other end, so regardless whether the voltage is coming from the power source or from RA.1, RA.0 never sees above 0v it seems. Any Ideas? Im sure it's something stupid on my part.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:Why are you going through a 100K resistor ? That won't work. Just hook the 4.8 volts directly to the 10K resistor. Bean.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJ Allen wrote: [Quoting: "djh82uk"] my cap says it's a 104 or 103 A 104 is 0.1uF; a 103 is 0.01uF. So, which is it? It's supposed to be a 0.01uF (103.) That could be a problem, makes a difference. [The "capacitor code" is the value in picofarads. So, a 103 is 10 followed by 3 0's pF: 10,000pF / 10nF / 0.01uF] 10K. So, they're both brown-black-orange?

If the circuit is disconnected from the SX pins you should measure the source voltage between the junction (R1, R2, C) and Ground or something is wrong (a bad contact in your breadboard, a bad cap.) ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=244365#m245202 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:

Ok thanks guys will check when i can get back in the workshop DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=244365#m245217 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:right it is deffo a 103 cap (brown ceramic type), resistors were sold as 10k and multimeter also says they are 10k, (brown, orange, black, black, Brown) orange may be red. with power disconnected to the sx, i get 5v before the resistor, and 0v after it. Has got to be my problem would you agree?

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:right, just tried it with a 2v Lead Acid battery and have the same problem, 0v at the end of the resistor, tried a new resistor same problem. Would you actually get any voltage at the end tho? As a 470ohm resistor reduces 12v enough to run an led, so would'nt 10k completley wipe it out? or is it current related?

There is defiantley no voltage getting past that 10k resistor anyway DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=244365#m245231 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJ Allen wrote:brown, orange, black, black, Brown = 1 , 3, 0, 0, x10 = 13K (If it's 'red' then the "3" is a "2"). Anyway, it's not 10K. The troubleshooting "experiment" requires that the circuit should be disconnected from the SX (note the Red Xs.) Are you using a breadboard or are you soldering to the ProtoBoard? If you are soldering to the ProtoBoard, then make sure it is to the "uncommitted" pads. If you simply solder these presumed resistors in series and place that across your voltage source, totally independent of the SX, does it "divide": 1/2 across one R and the same across the other?

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:Hiya Ha ha, did not think i mentioned that, but yes I have an ex-MOD multimeter with nixie tubes etc, has pressure relase valves and warm up circuit, very accurate, tho in this case I am using a normal digital multimeter, although I have a 5kv HT meter here too, tho never used it and prb never will (a good thing) Right, i changed resitors, I found some that were 10k, (brown, black, red, gold) and also showed as 9.98k on multimeter, Wired them as the diagrame (the one with the red x's) on a breadboard completley away from the sx, gave it 5v, and I get 5, 4.8v and 4.9v at the 3 possible test points on the resistors, so I then used these resistors on the sx board to replace the others, the sx is giving out 5v at the pin into one end of the resistors in series, and im giving it 5v at the other end, shows as 0v in the middle tho, and so RA.0 is also getting 0v, hence the lack of a reading. Perhaps i should describe the circuit, fresh eyes and all that. RA.1 is connected to a resistor, connected to the other end of that is another resistor, on the end of that is the possitive connection of the voltage i wish to measure. RA.0 is connected to the junction between the 2 resistors, , as is one leg of the cap, the other end of the cap is connected to the ground of the voltage I was to measure, as well as the ground of the sx protoboard (VSS). I am soldering to the protoboard and not using any pads that are connected to anything else. Thanks for your patience, sorry if I sound stupid, I am useless with electronics theory, something I really need to brush up on when I have time. Yet I can troubleshoot problems on games consoles, psu's etc, down to component level, im self taught which is prob not a good thing.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:OK, if I put the multimeter leads on as follows, possitve lead to VDD, and neg lead to RA.0, I get a 5v reading, so ra.0 is effectively ground.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJ Allen wrote:brown, black, red, gold is a 1kohm, 5% tol. (1, 0, and 2 0's.) Is it reading "0.998"? I think that "we" need to get these values nailed. You need to get some 10K resistors, brown-black-orange, or bust. I'm thinking about installing the 1.51 SX-Key/SXB to find out what's what here. But at this rate I've > 1/2-a-mind to just whump up a board for you to plug into. If anybody wants to jump in, it's OK by me.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:PJ, You can look at either the CHM or the PDF of the help file for the ANALOGIN documentation from this thread:

http://forums.parallax.com/forums/default.aspx?f=7&m=136824 Bean ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=244365#m245276 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:

Ok, im fairly sure it's 10k, the red could well be orange, it was ordered from rapid electronics and says 10k on the bag, and is deffo 9.98 on the multimeter, looking at the resistors there is very little difference between red and orange, or im colour blind :P Sorry for the confusion Thing is, if the one end of the resistor is positive, then surely the end (middle of the two) that connects to RA.0 is always going to be negative as it currently is. DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=244365#m245284 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:

Thanks for all your help btw, it's very much appreciated DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=244365#m245286 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJ Allen wrote:OK, thanks, Bean. There we read: The PROGRAM directive sets the execution start point (at a label.) When the NOSTARTUP option is used the SXB compiler will NOT insert the normal start-up code that pre-initializes all RAM addrs to zero; in this case the programmer is responsible for appropriate initialization... Note that when the NOSTARTUP option is used the TRIS registers are NOT initialized, so you MUST set up the ports as INPUTs or OUTPUTs. djh82uk's program has the NOSTARTUP option. So, even though somebody uses: InPin PIN RA.0 INPUT CMOS OutPin PIN RA.1 OUTPUT Does it matter where it is placed? If so, How? Should it be after the PROGRAM directive? Is a TRIS_A %0001 (A pin0 = in, pin1 = out) required still? I've always put everything after the PROGRAM directive. I've never used NOSTARTUP.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:

but if I always get 0v at the ra.0 pin, does that not point to a problem with the circuit itself? just trying to understand DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=244365#m245298 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJ Allen wrote:It isn't clear to me that RA.0 is made an INPUT and/or RA.1 is made an OUTPUT if they get declared as such before the PROGRAM directive (or if that matters, but I think it must.) Will this Compile and Run -- DEVICE SX48, OSC4MHZ FREQ 4_000_000 PROGRAM Start Start: 'TRIS_A = %00000001 a VAR Byte InPin PIN RA.0 INPUT CMOS OutPin PIN RA.1 OUTPUT Led1 PIN RA.2 OUTPUT 'Result Indicator Led2 PIN RA.3 OUTPUT 'Acquisition annunciator Testing: Led1 = 0 Led2 = 0 ANALOGIN InPin, OutPin, a, 1 IF a > 150 THEN LED1 = 1 'Threshold appx 2.9V Led2 = 1 'indicates acquisition PAUSE 2000 GOTO Testing ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=244365#m245313 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:I will give it a go tommorrow as it's 3am atm, I think RA.1 is deffo working as an output as it appears so in debug, and gives out 5V when it says it is, but I see what you mean by the input.

I will give your code a try Thanks :) DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=244365#m245323 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:ok, code would not work without an endif statement, however it seems that it ignores the input/output directives if under the "start:" as the led does not work, put them above the start and the led shows red, but still not getting any voltage.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJ Allen wrote:OK. Well, I copied over the 1.51.03 stuff (but now I don't have Help anymore, except the PDF, the .chm doesn't work.) I re-wrote, a bit, the previous, and this Compiles: DEVICE sx28, oschs3, TURBO, STACKX, OPTIONX IRC_CAL IRC_SLOW FREQ 10_000_000 PROGRAM Start a VAR Byte start: TRIS_A = %00000001 'RA.0 analogin's input 'RA.1 analogin's output 'RA.2 Result Indicator 'RA.3 Acquisition annunciator Inpin PIN RA.0 INPUT CMOS Testing: RA.2 = 0 RA.3 = 0 ANALOGIN Inpin, RA.1, a, 2 IF a > 150 THEN Good 'Threshold appx 2.9V RA.3 = 1 'indicates acquisition PAUSE 2000 GOTO Testing Good: RA.2 = 1 RETURN No ENDIF needed. I guess the THEN can't be to a "RA.x = _" like I had, so I made a "Good" subroutine to turn the "> 150" LED on with. I don't have any SX48s, only SX28s. So, it'll be a bit till I can get the circuit together and all, but that's what I'll be doing. ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=244365#m245562 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:Thanks PJ, driving me nuts, I still don't understand how it's going to work by the diagram, I just don't see how ra.0 can ever sense a possitive voltage.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:

Above code does not work either, same problem in that RA.0 is just not getting to se any voltage, i still think it may be a circuit problem, but as I said, i cannot see how it can ever be anything other than ground Thanks for all your help btw, I do really appreciate it DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=244365#m245865 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJ Allen wrote: OK -- It works: DEVICE sx28, oschs3, TURBO, STACKX, OPTIONX IRC_CAL IRC_SLOW FREQ 10_000_000 PROGRAM Start a VAR Byte blink VAR Byte start: TRIS_A = %00000001 'RA.0 analogin's input 'RA.1 analogin's output 'RA.2 Result Indicator YEL 'RA.3 Acquisition annunciator GRN LVL_A = %00000001 Testing: a = 0 RA.2 = 0 RA.3 = 0 ANALOGIN RA.0, RA.1, a, 1 IF a > 150 THEN Good 'Threshold appx 2.9V ? Back: RA.3 = 1 'indicates acquisition PAUSE 2000 FOR Blink = 0 TO 9 'Blink ACQ before re-testing RA.3 = 0 PAUSE 100 RA.3 = 1 PAUSE 100 NEXT Blink GOTO Testing Good: RA.2 = 1 GOTO Back Looks like I cannot IF...THEN...GOSUB (?), so I made the "Back" subroutine. The threshold looks to be approx. 1.2V. I think that's because with my 10MHz clock I should probably have used a smaller value CAP. The "manual" states that the optimal value will be found with experimentation (so, experiment.) I made a video, but youtube is slag cow today. If I can get it U/L'd later (>15 min. and it never finalized) I'll P-M you and post here same. I've broken practically every "style" rule, but it's documented well, in my opinion, and it's so short that one should be able to follow along anyway. If you leave the input floating then the result LED will be unreliable. ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=244365#m245970 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:ok, Still no luck this end I had to change the pins for the led as im using a tri-colour led, so just swapped ra.3 for ra.4 and set ra.3 to always be 0 took out the reference to the chip type and crystal, then used the device dialog box to set the chip to sx48 and crystal to internal 4MHz, problem is nothing happens, no leds or anything, and no voltage to the led pins, if I run it in debug nothing happens there either, it just sits at _progstart. I really appreciate all you have done PJ, I feel like im letting things down from my end, it's been ages since ive touched an SX which just isn;t helping, ive been over the circuit a hundred times, im wondering if there is something I should be doing different due to the fact it's an SX48?

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:

OK, may be getting somweher, PIN RA.4 just will not work, won't put out any voltage is it a Special/dual function pin on the sx48? trying to find the datasheet now ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=244365#m246020 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:HA HA HA Im so stupid, there isn't an RA.4, it's labelled on the board, has tracks going to it etc, but I presume it was for the SX52 or something, datasheet just confirmed, I would have thought it was RE that had only 4 pins and not RA, oh well, time to re-solder.

let you know how it goes DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=244365#m246021 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJ Allen wrote:With regard to the program as I wrote it, RA.3 should always be blinking or solid on (except during the very brief time that ANALOGIN is doing its thing.) That's your gut-check right there. Are you sure you have the LED polarities right? Upload your program so that we can all have at you.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:

Hmm, led probs fixed, but still not getting any reading at RA.0, checked the circuit again, and it is the same as yours, ra.0 gets -4.8v constantly DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=244365#m246028 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:Ok, Finally all working :) All thanks to PJ Allen of course, basically the problem was that it just would not work with RA.0, changed it to RC.0 and it worked with the code that PJ had written for it. I did try a different pin earlier on in this quest, but I think it still did not work due to the code not being right, but once PJ had a go at it it all got sorted :) The readings are a little funny, but consistent, I am using it in a cold shed, cheapo capacitors and the internal crystal at 4MHz, but it's doing it's jon and im happy.

Thanks a lot PJ and anyone else that added input :) Reminds me why i should stick to parallax micro's, for the forum support as I definatley need it DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=244365#m246044 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:Ok new question, can the SX48 check voltage with analogin on different pins one after the other? Or can it only be used on one pin per program?

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJ Allen wrote:I suspect you could have as many as you need, so long as each pair has its own ANALOGIN circuit.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:HMM, ive got it testing 2 voltages and it works, but if I drop the coltage on the RB test it's fine, re-apply power and it goes back to testing, but if I drop the voltage on the RC test then it does not update the value and stays in the lower voltage mode, although the relay does click on and off. Any ideas? DEVICE SX48, OSC4MHZ FREQ 4_000_000 PROGRAM Start 'NOSTARTUP a VAR Byte b VAR Byte blink VAR Byte start: TRIS_A = %00000000 TRIS_B = %00000001 TRIS_C = %00000001 'RC.0 analogin's input 'RC.1 analogin's output 'RA.2 Result Indicator YEL 'RA.3 Acquisition annunciator GRN LVL_C = %00000001 LVL_C = %00000001 Testing: 'a = 0 RA.1 = 0 RA.2 = 0 RA.3 = 0 RB.3 = 0 RB.4 = 0 ANALOGIN RC.0, RC.1, a, 2 'pause 1000 ANALOGIN RB.5, RB.6, b, 2 watch a watch b IF a < 190 THEN Charge1 IF b < 190 THEN Charge2 'Threshold appx 2.9V ?

Back: RA.1 = 0 RA.3 = 1 RB.3 = 1 'indicates acquisition PAUSE 2000 FOR Blink = 0 TO 9 'Blink ACQ before re-testing RA.3 = 0 RB.3 = 0 PAUSE 100 RA.3 = 1 RB.3 = 1 PAUSE 100 NEXT Blink GOTO Testing Charge1: RA.2 = 1 RA.1 = 1 RB.3 = 1 pause 5000 IF b < 190 THEN Charge2 GOTO Testing Charge2: RA.3 = 1 RB.4 = 1 Pause 5000 GOTO Testing ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=244365#m246340 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:STill struggling with this, just cannot get it to retest RC.0, first test works fine, seconds just does not happen, while RB.5 wil test and retest ok. the code is very similar between charge 1 and charge2, but even if I make them identical it still does not work Any ideas?

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, djh82uk wrote:

Ok the problem was that is needed a Pause after the command to turn the relay off, thanks to PJ Allen for figuring this out :) DJH ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=3&m=244365#m250278 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)