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Adafruit 16-Channel 12-bit PWM/Servo Driver - I²C Interface - PCA9685
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Adafruit 16-Channel 12-bit PWM/Servo Driver - I²C Features
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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, it's completely free running!
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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)
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Reverse polarity protection on the terminal block input
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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
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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. You may also use right-angle 3x4 headers
About Adafruit 16-Channel 12-bit PWM/Servo Driver - I²C
Adafruit 16-Channel 12-bit PWM/Servo Driver I²C Interface - PCA9685 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 perhaps you want to drive a lot of LEDs with precise PWM output. You realize your microcontroller has a limited number of PWM outputs, what now? Get this handy PWM and Servo driver breakout. 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) 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
