Adafruit 16-Channel 12-bit PWM/Servo Shield - I2C interface

Key Features:

• I2C-controlled PWM driver with a built in clock. No need to continuously send it signal tying up your microcontroller, its completely free running!
• It is 5V compliant, which means you can control it from a 3.3V Arduino and still safely drive up to 6V outputs
• 6 address select pins so you can stack up to 62 of these on a single i2c bus, a total of 992 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

When we saw this chip, we quickly realized what an excellent add-on this would be. Using only two I2C pins, control 16 free-running PWM outputs! You can even stack up 62 shields to control up to 992 PWM outputs (which we would really like to see since it would be glorious and like 4 feet tall) Because I2C is a shared bus you can also connect other I2C devices and sensors to the SCL/SDA pins as long as their addresses don' t conflict (this shield has address 0x40). Plug in 16 servos at once with the 3 pin connectors stacked in groups of 4 (Servo plugs are slightly wider than 0.1" so you can only stack 4 next to each other on 0.1" header) You' ll need to pick up stacking headers and right angle 3x4 headers in order to stack on top of this shield without the servo connections getting in the way.

Item Specifics
Dimensions (no headers or terminal block): 2.1" x 2.7" x 0.1" (54mm x 70mm x 3mm)
This board/chip uses I2C 7-bit addresses between 0x60-0x80, selectable with jumpers.
Fully assembled and tested shield
4 pcs of 3x4 male straight header
2-pin terminal block
Stick of 0.1" header
Some soldering required
Servos and Arduino not included