Hi,
I'm not sure if this should be in the Embedded section or Analog and Mixed Signal section. If it's in the wrong sections, mods please move.
I'm reading the temp using a thermistor in a voltage divider. Connect that to an Arduino ADC input and I read the room temp ~61F. All is good.
Then I put the voltage divider output through a unity gain opamp and now the room temp reads ~167F.
This was a previously working circuit that I had put aside during semester. Now semester's over I have returned to it and can't figure out the problem.
I thought maybe the opamp had received a static shock, so I soldered a new one to the breakout board, but the result was the same.
I have disassembled the circuit and reassembled it a few times, tried using a different Arduino, different breadboard, always the same problem.
I have attached a photo of the schematic being used. Where am I going wrong?
I'm not sure if this should be in the Embedded section or Analog and Mixed Signal section. If it's in the wrong sections, mods please move.
I'm reading the temp using a thermistor in a voltage divider. Connect that to an Arduino ADC input and I read the room temp ~61F. All is good.
Then I put the voltage divider output through a unity gain opamp and now the room temp reads ~167F.
This was a previously working circuit that I had put aside during semester. Now semester's over I have returned to it and can't figure out the problem.
I thought maybe the opamp had received a static shock, so I soldered a new one to the breakout board, but the result was the same.
I have disassembled the circuit and reassembled it a few times, tried using a different Arduino, different breadboard, always the same problem.
I have attached a photo of the schematic being used. Where am I going wrong?
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