16 Channel 12-bit PWM/Servo Driver I2C interface-PCA9685

Adjustable frequency PWM up to about 1.6 KHz
12-bit resolution for each output – for servos, that means about 4us resolution at a 60Hz update rate
Configurable push-pull or an open-drain output
The output enable pin to quickly disable all the outputs
Terminal block for power input
Reverse polarity protection on the terminal block input
Green power-good LED
3 pin connectors in groups of 4 so you can plug in 16 servos at once
Chainable design
A spot to place a big capacitor on the V+ line
220-ohm series resistors on all the output lines to protect them, and to make driving LEDs trivial.
This board/chip uses I2C 7-bit address between 0x60-0x80, selectable with jumpers.