So after a couple of trials and errors, I found using 0.1uF and 1K a good pair of RC values to filter the 50Hz line frequency nose. (The blue channel is input, yellow trace output of high pass filter.) I also found that a 200VAC LED lamp creates a lot of high frequency noise.
Anyway, the simple RC based high pass filter is more or less working. Now I think I need to make a high low pass filter to filter the high frequency noise, and hopefully get the ECG signal I want.
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