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The Adafruit 16-Channel PWM/Servo Shield brings PCA9685-based servo and PWM control to any Arduino in a convenient shield format. Using only I2C (SCL and SDA...

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The Adafruit 16-Channel PWM/Servo Shield brings PCA9685-based servo and PWM control to any Arduino in a convenient shield format. Using only I2C (SCL and SDA), the shield provides 16 channels of 12-bit PWM output with a built-in clock — no continuous signal from your microcontroller needed.

Up to 62 shields can be stacked on a single I2C bus for a total of 992 PWM outputs. The shield also features a 5×20 prototyping area for additional wiring, and is 5V compliant for driving outputs up to 6V from a 3.3V Arduino.

Key Features

  • 16 PWM Channels12-bit resolution (4,096 steps) per output
  • PCA9685 Driver – Free-running I2C-controlled PWM with built-in clock (address 0x40)
  • Stackable – Up to 62 shields on one I2C bus (12 of 16 outputs accessible when stacked)
  • 5V Compliant – Control from 3.3V logic, drive up to 6V outputs
  • Adjustable Frequency – PWM up to ~1.6 kHz
  • Configurable Output – Push-pull or open-drain
  • 220Ω Series Resistors – Output protection and easy LED driving
  • Reverse Polarity Protection – On terminal block power input
  • 5×20 Proto Area – Extra space for custom wiring
  • Servo Connectors – 3-pin headers in groups of 4 for up to 16 servos

Also Available

Ideal For

  • Arduino-based robotics with multiple servos
  • Precise LED dimming and colour mixing
  • Kinetic art and animatronics
  • Large-scale PWM output expansion

Package Contents

  • 1× Adafruit PCA9685 16-channel PWM/Servo shield (assembled and tested)
  • 4× 3×4 male straight headers (for servo plugs)
  • 1× 2-pin terminal block (for power input)
  • 1× 0.1" header strip
Note: Servos and Arduino not included. Light soldering required to attach headers. Terminal block colour may vary (blue or black). Compatible with Arduino UNO, Leonardo, Mega, Zero, Metro M0/M4, and similar R3-format boards.

Specifications

  • Driver Chip – PCA9685
  • Channels – 16
  • PWM Resolution – 12-bit (4,096 steps)
  • Servo Resolution – ~4µs at 60Hz update rate
  • Max PWM Frequency – ~1.6 kHz
  • Output Voltage – Up to 6V
  • Interface – I2C (6 address select pins)
  • Form Factor – Arduino R3 shield

Jargon buster

Plain-language definitions for the technical terms used above.

12-bit resolution
12-bit resolution means the sensor’s measurement is divided into 4096 possible digital values. Higher resolution can make small changes in motion or tilt easier to detect, as long as the sensor range and noise are suitable for the project.
breakout
A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
Headers
Rows of metal pins used to plug a module into a breadboard or connect it with jumper wires. Pre-soldered headers make the module easier to use straight away without needing to solder the pins yourself.
I2C
I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
LED
A light-emitting diode is a small electronic component that lights up when current flows through it in the correct direction. In this kit, LEDs create the flashing effect, so polarity and correct soldering matter for the project to work.
microcontroller
A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
PWM
Pulse Width Modulation is a way for a digital pin to simulate variable output power by switching on and off very quickly. It matters for controlling things like LED brightness, motor speed, or servo-style signals from a microcontroller pin.
reverse polarity protection
A circuit feature that helps protect the board if power is connected the wrong way around. It matters because it can reduce the chance of damaging the breakout during wiring mistakes, especially in classroom or prototyping use.
servo
A servo is a motor with built-in position control, usually told to move to a specific angle by a control signal. It matters when you need repeatable movement, such as steering, arms, flaps, or linkages, rather than continuous spinning.
Shield
An add-on board that plugs into a main controller board to give it extra features such as sensing, motor control or communication. Knowing a product supports shields helps you judge whether it can connect neatly into an existing maker-board setup.
Terminal block
A connector used to join wires together in a neat, removable, or serviceable way. For this product, it helps split one power input into several outputs without soldering.
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