In the temperature sensing circuit below, I am getting some 60 Hz in the output. I would like to place a capacitor to help block that but I have questions Bout capacitor size and location. This sensing circuit is for an Arduino that will use a PID controller to adjust a 3D printer bed heater. The more noise free the temp sensor the better the PID control will work.
1: Should the capacitor be across the output to ground or should it be across the temp sensor which is likely where the noise is being picked up?
2: If it's too small it won't filter adequately and if it is too large it will slow the temperature response. How can I figure out what the capacitance should be?
1: Should the capacitor be across the output to ground or should it be across the temp sensor which is likely where the noise is being picked up?
2: If it's too small it won't filter adequately and if it is too large it will slow the temperature response. How can I figure out what the capacitance should be?