noise removal

Hello all, I have 2 almost similar PCBs for voltage and current measurement. I have used 230VAC from the outlet to test them both. The circuit in both boards is similar which is just a voltage divider to reduce the input voltage (see attached image). but I got some noise in one of them even...

Hello everyone. I have a sensor that I am continuously reading data from, at a constant rate, using python. Looking at the data there is obviously noise in it (bounces around when it should be zero or a constant value). After googling for 2 days I've not been able to find a way to remove the...