So I placed the electrodes on my left arm, right arm, and left foot. The output at A0 is very noisy. I am not sure if the recurring spikes are the R waves. I found the period about 750ms which corresponds to 84 beats per minute. I hand measure my heart rate and found it only 72 bpm.
I think there are many things I can find out.
1. The switching power supply I am using might be noisy. What picked up might be the switching frequency at the final low pass filter output.
2. I might need to assembly a well shielded electrode cable, to check if the unshielded cable is noisy.
.END
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