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Want to make a hexapod walker? Maybe you're making a piece of art with tons of moving parts, or you need to drive a ton of LEDs with precise PWM output. Your microcontroller has a limited number of PWM outputs, and you find yourself running out! Not with the Adafruit 16-Channel 12-bit PWM/Servo Driver - I2C interface. With this pwm and servo driver breakout, you can control 16 free-running PWM outputs with just two pins! Need to run more than 16 PWM outputs? No problem. Chain together up to 62 of these beauties for up to an outstanding 992 PWM outputs. Dimensions (no headers or terminal block) 2.5" x 1" x 0.1" (62.5mm x 25.4mm x 3mm) Weight (with 3x4 headers & terminal block): 9grams Terminal block for power input (or you can use the 0.1" breakouts on the side) Green power-good LED "Chain-able" design 220 ohm series resistors on all the output lines to protect them, and to make driving LEDs trivial i2c-controlled PWM driver with a built in clock. Unlike the TLC5940 family, you do not need to continuously send it signal tying up your microcontroller, its completely free running! 6 address select pins so you can wire up to 62 of these on a single i2c bus, a total of 992 outputs - that's a lot of servos or LEDs 12-bit resolution for each output - for servos, that means about 4us resolution at 60Hz update rate Output enable pin to quickly disable all the outputs (1)Drive board connected to Arduino: "Classic" Arduino pin mode: GND -> GND Analog 5 -> SCL Old Mega pin way: GND -> GND Digital 21 -> SCL Leonardo): + 5v -> VCC SDA -> SDA (2) power supply part: Most servos are connected using standard 3-wire female plugs, as long as the corresponding pin into the driver board on it. (Ground wire is generally black or brown, the signal line is generally yellow or white)