I am reading the following signal from an open drain output, and trying to read the signal frequency. However, I am getting short spikes in the wave as seen below, and this is messing with the reading of my microcontroller. Any advice on how to filter this noise? Thank you 
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1 Answer
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any low-pass filtering will do. Say, your signal frequency is 1 kHz, and these spikes are less than 5 µs long: a low-pass filter with a cut-off frequency above 11 kHz will not hurt your signal significantly, but remove the spikes.
answered Jul 18, 2021 at 17:18