Hello, for an investigation I am using an Arduino Uno WIFI r4 to log the voltage of a 10-20kV circuit. This is for an investigation into EHD thrusters. I am using a voltage divider with an R1 that is equal to 40,880,000 ohms and the R2 is equal to 10,000 ohms. The A1 input is between R1 and R2 and ground is connected after R2. I am using along pins and the value read which is then put trough the formula voltage = value * (5.0/1024)*((R1 + R2)/R2). I am running into the problem that using the Arduino Uno the voltage that it is logging is in the range of 350V. This should not happen because the circuit is discharged and when I add a contact across R2 the voltage goes to zero. I had not ran into this issue when I was using an Arduino Micro. However the Micro is unable to log to the cloud which is why I am using the Uno. Is there any way to solve this issue.
Thanks.
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