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You can only control two servos independently with the Pi's hardware PWM. GPIO 12/18 share a channel. GPIO 13/19 share a channel. The same settings apply to GPIO which share a channel. E.g. If servo1 is on GPIO12 and servo2 on GPIO18 they will get the same signal (same frequency, same pulsewidth). pigpio supports the hardware PWM features of the Pi. So you ...

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