I have a need for measuring voltages between 4 & 6V DC. Does anyone have
any pointers so I can get started. The reason behind this is to measure
voltage and temperature inside my PC. I've been having trouble with
voltages on my PC and would like to shutdown the system when things get
way out of line.
The 16F84 will communicate with the PC via RS232, it will use a DS1802
and an LTC1298 ADC. The ADC is already on a Micromint PICSTICK I have.
Neil Cherry http://home.att.net/~ncherry worldnet.att.netncherry
this is what I would do.
instead of using 84 and ltc1298 use pic16c(71)or 711
setup reference voltage ( external connect to +6 v )
when analog input voltage = 4 your ADC adres register = 0x40 (64) I think
when analog input voltage = 6 your ADC adres register = 0xFF (255)
you can use XOR or SUB even bit test instructions to determine start and end
I also have that little board with real time clock and ADC chip on it
the thing is why use 2 chips if you can use just one. you can still use
the same board without ADC chip.
a few weeks ago I have done a project with pressure sensors which is
similar to what you are trying to do except when the pressure reaches to
50 PSI turns the timer on.Total sensors I had 6 I used 2 ( 71 )
Undetermined origin c/o LISTSERV administrator wrote:
= http://www.compufire.com =
= compufire.com = andre
= compufire.com = mcu-engineering
= Andre Abelian: Engine Electronics, Inc.=
= Tel 909-589-5485 Fax 909-598-5695 =
National Semiconductors has a new chip that will just do what you want, in
fact more than you want. It is the LM80 - serial interface microprocessor
system haardware monitor. It has a temperature sensor, fan speed controller
built-in and accepts 7 voltage inputs. One of the input can be negative
voltage, too. The chip works on i2c bus.
Hope this helps.
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