pt-100 input, 4-20ma output

harry_s

Hello everybody

I am new to stamps...

I had a simple pid module and I would like to experiment a little with the stamp2...

how can i connect a pt-100 thermometer to the stamp and how can I get 4-20mA output..??

I am a control systems student and I want to experiment with the algorithms but I do not know much about electronics...

any help will be appreciated...

Harry

stamptrol

You can experiment with PID (the calculation part) by using a pot and the RCTIME command for input and use PWM as the output. That way you don't need to buy too much extra equipment.

If you're needing real industrial signals, you'll need an A/D converter ( LTC1298) for the inputs and a D/A (LTC1451, I think) for the output. Then, get a pt-100 signal conditioner for the sensor to feed the input a/d and a voltage-to-current converter module to read the d/a and convert it to 4-20 mA.
Parallax or Digikey have the a/d and d/a. A good source of industrial equipment like the signal conditioners is Automation Direct; they're online.

Cheers,

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Tom Sisk

http://www.siskconsult.com
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