The Adafruit 16-Channel PWM/Servo Hat added to the Raspberry Pi adds the capability to control 16 Servos and also do PWM up to 1.6 KHz with 12 bit precision. It 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!
For use with Raspberry Pi Model A+, B+, or Pi 2 can be used with the Model A or B if you use a tall 2x13 header instead of the included 2x20.
2-pin terminal block
(4) 3x4 headers
(1) 2x20 socket header
Note: light soldering may be required