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

SKU: ADA815

$25.00 AUD, inc GST
$22.73 AUD, exc GST

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

SKU: ADA815

$25.00 AUD, inc GST
$22.73 AUD, exc GST
3 reviews 0 5 5
In stock, ships today if ordered before 2PM
Delivered by Thu, 24th of Aug

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 Adafruit saw this chip, Adafruit 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 Adafruit 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

Adafruit 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 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 Adafruit's tutorial with Arduino and you can get Adafruit's documented Arduino library which has both PWM and Servo examples from github!

Technical Details

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 Adafruit now use a much beefier polarity-protection transistor. Functionality is otherwise the same

This product is listed in:

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Product Comments


Customer Reviews

  1. Review by Antonino verified purchaser
    Rating
    100

    looks great but havent used it yet will start soon though (Posted on 4/04/2017)

  2. Review by Roy verified purchaser
    Rating
    100

    Have tested this one on a couple of different Arduinos and the Raspberry Pi 3. This is a popular board, so finding a reliable library and examples was very easy. I2C is simplicity itself with 2 wires/pins used regardless of how many servos - this board can take care of powering them (if necessary it can use an external power supply) and does the PWM. If you are thinking of using two or more servos, this is a great board. (Posted on 11/09/2016)

  3. Review by paul - Very good, works as advertised
    Rating
    100

    Succesfully using these with an Arduino to drive micro servos and some LEDs. Quite straightforward to use, well made. Requires some soldering of the header pins, but that's good since allows customisation to suit your particular project.

    (Posted on 4/12/2013)

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