#357. If you need a reference high than 2.5 V, amplify with a nice single supply (+5) OP amp. i.e. 5V, so you don't risk blowing up the arduino.
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Some years back my wife wanted to see the snow so we drove for many hours to where it snows here, it was that bloody cold she took a picture with the camera & said lets get out of here before we freeze to death. I like the snow on postcards & television & that's about it?
The PID constants won't work at every setpoint and step changes near the intended setpoint get you really close,