PCA9685 16 Channel 12-bit PWM/Servo Driver-I2C interface shield module It\'s an i2c-controlled PWM driver with a built in clock. That means that, unlike theTLC5940 family, you do not need to continuously send it signal tying up yourmicrocontroller, its completely free running!• It is 5V compliant, which means you can control it from a 3.3V microcontroller and stillsafely drive up to 6V outputs (this is good for when you want to control white or blueLEDs 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 of992 outputs - that\'s a lot of servos or LEDs• Adjustable frequency PWM up to about 1.6 KHz• 12-bit resolution for each output - for servos, that means about 4us resolution at 60Hz update rate• Configurable push-pull or open-drain output• Output enable pin to quickly disable all the outputsWe wrapped up this lovely chip into a breakout board with a couple nice extras• Terminal block for power input (or you can use the 0.1" breakouts on the side)• 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 (Servo plugs areslightly wider than 0.1" so you can only stack 4 next to each other on 0.1" header• "Chain-able" design• A spot to place a big capacitor on the V+ line (in case you need it)• 330 ohm series resistors on all the output lines to protect them, and to make driving LEDs trivial• Solder jumpers for the 6 address select pins