Temperature sensor output to PIC

Arfaq · Joined: 30 Apr 2004 Posts: 1

Hi im a new CCS user and a wanted to know if it was possible to read the output voltage (mV) from a temperature sensor by the PIC, which will decode the voltage to temp?? Please could you give me a example of the code and the requirements. thank you.
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Arfaq Ahmed

Couch · Posted: Fri Apr 30, 2004 10:04 am

Search for LM34 and you will get a few ideas, and some sample code. There are a lot more examples if you use a serial or I2C device...

SherpaDoug · Joined: 07 Sep 2003 Posts: 1640 Location: Cape Cod Mass USA

If you want to see how to do it with real primitive hardware I would recommend Microchip application note AN512 which connects a thermistor to PIC digital pins with resistors and a cap and uses the timer to measure accurate temperature. AN513 uses simillar principles for general voltage measurement.
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Steve H · Guest

Here is a link to a project that I did a while back,

http://www.geocities.com/hagtronics/thermometer.html

If I was to do this today I would use a 16F873 with the 10 bit A/D and a LM50 temp sensor. If you scale the A/D reference on the 873 to 2.5 volts and use an LM50 you can do away without the OPAMP.

Steve H.

Steve H · Guest

Here is a link to a project that I did a while back,

http://www.geocities.com/hagtronics/thermometer.html

If I was to do this today I would use a 16F873 with the 10 bit A/D and a LM50 temp sensor. If you scale the A/D reference on the 873 to 2.5 volts and use an LM50 you can do away with the OPAMP.

Steve H.