Measuring netfrequency

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  • arduino, on pin 3 a 1kHz clock signal
  • the signal to measure is connected to pin A0 of the arduino


first attempt

  • when an interrupt comes in via pin 3, a uS timestamp is taken ('t0')
  • everytime the sign of the signal changes (via A0), then a timestamp is taken and the timestamp t0 is subtracted

result

  • it works somewhat but there's an enormous lapse