op amp Amplifying signal from CO2 Sensor


Posted on Feb 7, 2014

Amplify a MG811 CO2 sensor to a range readable by an ATMEGA2560 (0-5v). I have other analog sensors, so do not want to change ref voltage on Atmega. I have found a module that scales the signal and want to replicate the circuit from the documentation, but want to make sure that the schematic I have is correct. It seems from the module documentation that the sensor operates


op amp Amplifying signal from CO2 Sensor
Click here to download the full size of the above Circuit.

in a range of 100-600mV (though this is different from the datasheet which shows a range between about 260-350mv). The module uses a LMC662 dual op amp.




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