FrequencyIn – Read a frequency signal¶
FrequencyIn is used to measure the frequency, in hertz, of a digital signal on an incoming pin. Accuracy has shown to be within 10%, if not better. It is recommended to utilize an average of multiple samples to smooth out readings.
Frequencies below 1KHz are not currently detectable.
FrequencyIn will not determine pulse width (use
Create a FrequencyIn object associated with the given pin.
Read the incoming frequency from a pin:
import frequencyio import board frequency = frequencyio.FrequencyIn(board.D11) # Loop while printing the detected frequency while True: print(frequency.value) # Optional clear() will reset the value # to zero. Without this, if the incoming # signal stops, the last reading will remain # as the value. frequency.clear()
Deinitialises the FrequencyIn and releases any hardware resources for reuse.
No-op used by Context Managers.
Automatically deinitializes the hardware when exiting a context. See Lifetime and ContextManagers for more info.
Pause frequency capture.
Resumes frequency capture.
Clears the last detected frequency capture value.
The capture measurement period. Lower incoming frequencies will be measured more accurately with longer capture periods. Higher frequencies are more accurate with shorter capture periods.
When setting a new
capture_period, all previous capture information is cleared with a call to
Returns the value of the last frequency captured.