On all GPIO pins, the Raspberry Pi hardware board enables software pulse-width modulation (PWM). Each pin emits a square waveform with configurable frequency and duty cycle when configured for PWM. The PWM output frequency must be at least 10 Hz.
You'll need to change the /boot/config.txt file and add an overlay to activate the hardware PWM on the Raspberry Pi. The Raspberry Pi kernel documentation lists two options. Either a single channel or a dual channel is available.
A specified frequency or period is used to regulate a specific servo. A servo motor anticipates an update every 20 milliseconds with a pulse of 1 to 2 milliseconds. This is equivalent to a duty cycle of 5% to 10% at 50 Hz.
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