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

Adafruit 16-Channel 12-bit PWM/Servo Driver - I2C interface - PCA9685
6 186 Ft

You want to make a cool robot, maybe a hexapod walker, or maybe just a piece of art with a lot of moving parts. Or maybe you want to drive a lot of LEDs with precise PWM output. Then you realize that your microcontroller has a limited number of PWM outputs! What now? You could give up OR you could just get this handy PWM and Servo driver breakout.

    • When we saw this chip, we quickly realized what an excellent add-on this would be. Using only two pins, control 16 free-running PWM outputs! You can even chain up 62 breakouts to control up to 992 PWM outputs (which we would really like to see since it would be glorious)

      • It's an i2c-controlled PWM driver with a built in clock. That means that, unlike the TLC5940 family, you do not 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 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 - 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 outputs

      We 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. The terminal block included with your product may be blue or black.
      • Green power-good LED
      • 3 pin connectors in groups of 4 so you can plug in 16 servos at once (Servo plugs are slightly 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)
      • 220 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

      This product comes with a fully tested and assembled breakout as well as 4 pieces of 3x4 male straight header (for servo/LED plugs), a 2-pin terminal block (for power) and a piece of 6-pin 0.1" header (to plug into a breadboard). A little light soldering will be required to assemble and customize the board by attaching the desired headers but it is a 15 minute task that even a beginner can do. If you want to use right-angle 3x4 headers, we also carry a 4 pack in the shop.

      Check out our tutorial with CircuitPython & Arduino libraries/examples, wiring diagrams, schematics, Fritzing and more!

    • Specifications:

      • Dimensions (no headers or terminal block) 2.5" x 1" x 0.1" (62.5mm x 25.4mm x 3mm)
      • Weight (no headers or terminal block): 5.5grams
      • Weight (with 3x4 headers & terminal block): 9grams
      • This board/chip uses I2C 7-bit address between 0x40-0x7F, selectable with jumpers

      Datasheets, EagleCAD PCB files, Fritzing object and more in the tutorial!

      Revision History:

      • As of Feb 16, 2015 we now use a much beefier polarity-protection transistor. Functionality is otherwise the same
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