Interfacing a thermopile to an AVR

Thread Starter


Joined Aug 30, 2009
Can someone tell me if the thermopile can directly input to the Arduino ADC port? My thermopile output is typical at about 0.2mv. I assumed I would need a lot of amplification, such as around 10K times, to output around 2V. Am I wrong?

I've been fighting with Op Amp circuits trying to boost the thermopile output but it's been a long, confusing road. It's difficult to get component values right and I can't seem to find a good basic circuit to adapt on the Net.
BTW, my Arduino runs on a 5V USB voltage supply.


Joined Jan 28, 2005
Perhaps you can provide us with your thermopile's part number so that one of our members can research the specific device you are using.



Joined Nov 6, 2005
Have a look at the AD594 and AD595 devices, these are specifically made for converting thermocouple signals to more realistic voltages.