Servo motors are often driven using the PWM outputs available on most embedded MCUs. But while the Pi does have native HW support for PWM, there is only one PWM channel available to users at GPIO18. That kind of limits your options if you need to drive more than one servo or if you also want to dim an LED or do some sort of other PWM goodness as well. Thankfully … the PI does have HW I2C available, which we can use to communicate with a PWM driver like the PCA9685, used on Adafruit’s 16-channel 12-bit PWM/Servo Driver!
Using this breakout, you can easily drive up to 16 servo motors on your Raspberry Pi using our painless Python library and this tutorial.
Note this cannot be used for driving anything other than analog (1-2 millisecond pulse drive) servos. DC motors, AC motors and digital servos are not going to work.
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Adafruit 16-Channel 12-bit PWM/Servo Driver – I2C interface – PCA9685 – You want to make a cool robot, maybe a hexapod walker, or maybe just a piece of art with a lot of moving parts. Or maybe you want to drive a lot of LEDs with precise PWM output. Then you realize that your microcontroller has a limited number of PWM outputs! What now? You could give up OR you could just get this handy PWM and Servo driver breakout. (read more)
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