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Arduino reading highly floating pins

Arduino reading highly floating pins

‎06-28-2021 04:38 AM

I am trying to measure resistance by reading the voltage change using a Wheatstone bridge and an opamp to amplify the voltage. I have read about the pins "floating", but the voltage I am reading with the arduino is floating from 0 to 5 V when connected to the output of the opamp. When not connected the voltage settles to a constant value, but becomes extremely noisy when connected to absolutely anything. 

 

How would you go about of smoothing this noise? 

 

 

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