It exists in different format 4,12, 18 and 24 channels. The one we used in this example is a Maestro board proposed by Pololu. In that case, it is necessary to use a servo driver (which can control up to 32 servomotors) that communicate with Arduino using a serial port and transmit the PWM to servomotors. When several motors are used in a project, usually the number of outputs needed exceed the capacity of the Arduino board. Overview of the serial controller Maestro
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