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On sale! Arduino Uno R3 (Made in Italy) Quick view

Arduino Uno R3

Arduino UNO in Bangladesh The Arduino Uno is a microcontroller board based on the ATmega328 (datasheet). It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller.

Price BDT 399
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16 Channel 12 bit PWM / Servo Driver I2C interface PCA9685
  • 16 Channel 12 bit PWM / Servo Driver I2C interface PCA9685
  • 16 Channel 12 bit PWM / Servo Driver I2C interface PCA9685
  • 16 Channel 12 bit PWM / Servo Driver I2C interface PCA9685

16 Channel 12 bit PWM / Servo Driver I2C interface PCA9685

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 maybe you want to drive a lot of LEDs 
with precise PWM output.

BDT 499
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Description
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
  • 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 Arduino and you can get our 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 0x60-0x80, selectable with jumpers

Downloads: PCA9685 datasheet

Revision History:

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