2327&nbsp;-&nbsp;Raspberry Pi PWM Servo Hat Development Board The Adafruit 16-Channel 12-bit PWM/Servo HAT will drive up to 16 servos or PWM outputs over I2C with only 2 pins. The on-board PWM controller will drive all 16 channels simultaneously with no additional Raspberry Pi processing overhead. What's more, you can stack up to 62 of them to control up to 992 servos - all with the same 2 pins! It can also do PWM up to 1.6 KHz with 12 bit precision, all completely free-running. For use with Raspberry Pi Model A+ or B+, can be used with the Model A or B if you use a tall 2x13 header instead of the included 2x20. Please note! This kit does not come with Raspberry Pi, servos, or required 5V power supply.