PCA9685 16 Channel 12-Bit PWM Servo Motor Driver IIC Module for Arduino Robot It is 5V compliant, which means you can control it from a 3.3V microcontroller and still safely drive up to 6V outputs (this is good for when you want to control white or blue LEDs with 3.4+ forward voltages). 6 address select pins so you can wire up to 62 of these on a single i2c bus, a total of 992 outputs. 12-bit resolution for each output - for servos, that means about 4us resolution at 60Hz update rate 16 Channel PWM/Servo Driver IIC interface-PCA9685 for arduino or Raspberry pi shield module servo shield