PCA9685 16-Channel 12-Bit PWM Servo Driver

The PCA9685 16-Channel 12-Bit PWM Servo Driver provides 16 independently programmable PWM outputs through an I²C interface. It is suitable for multi-servo control in robotic arms, robotics, automation and microcontroller projects using Arduino, ESP32, Raspberry Pi and other compatible controllers.

Description

The PCA9685 controller provides 16 individual 12-bit PWM channels with 4096-step resolution. Communication is handled through SDA and SCL I²C lines, reducing the number of controller I/O pins required for multi-channel PWM control.

For servo applications, the board provides dedicated three-pin channel headers marked PWM, V+ and GND, along with a separate screw-terminal connection for the external servo supply. Six hardware address inputs allow multiple PCA9685 devices to share the same I²C bus.

Key Features

• PCA9685 controller IC
• 16 independently programmable PWM outputs
• 12-bit PWM resolution — 4096 steps
• I²C communication through SDA and SCL
• Dedicated PWM, V+ and GND connections for each channel
• External servo power terminal
• Hardware-configurable I²C address
• Output Enable (OE) connection
• Suitable for controlling multiple servos
• Compatible with common I²C-capable microcontrollers and SBCs

Technical Specifications

• Controller: PCA9685
• PWM Channels: 16
• PWM Resolution: 12-bit / 4096 steps
• Interface: I²C
• Communication Pins: SDA, SCL
• IC Supply Voltage: 2.3–5.5 V
• PCB Logic Marking: 3–5 V
• PWM Frequency — PCA9685 IC: approximately 24–1526 Hz typical
• PWM Frequency — PCB Marking: 40–1000 Hz
• Servo Supply Marking: V+ up to 6 V
• Output Enable: OE
• Address Selection: 6 hardware address positions
• Default I²C Address: 0x40 when address bits are LOW
• Servo Outputs: 16 × PWM / V+ / GND

Compatibility

Suitable for projects using Arduino, ESP32, Raspberry Pi and other controllers with a compatible I²C interface. Appropriate wiring, software configuration and external servo power should be selected for the controller and servos being used.

Applications

Robotic arms, multi-servo robots, animatronics, pan-and-tilt mechanisms, robotics projects, automation prototypes and other multi-channel PWM-control applications.

Package Includes

1 × PCA9685 16-Channel 12-Bit PWM Servo Driver Module

FAQs

What is the PCA9685 servo driver used for?
The PCA9685 module provides 16 programmable PWM channels through an I²C interface and is commonly used for controlling multiple servos in robotics, robotic arms, automation and embedded projects.

How many servos can the PCA9685 module control?
The board provides 16 PWM output channels, allowing up to 16 compatible servos to be connected individually.

What is the PWM resolution of PCA9685?
The PCA9685 provides 12-bit PWM resolution, giving 4096 steps per PWM cycle.

Can I use PCA9685 with Arduino?
Yes. The module can be used with Arduino boards that support I²C communication when wired and configured correctly.

Is PCA9685 compatible with ESP32?
Yes. It can communicate with an ESP32 through its I²C interface when the electrical connections and software are configured correctly.

Can I use PCA9685 with Raspberry Pi?
Yes. Raspberry Pi boards with an available I²C interface can communicate with the PCA9685 when logic and servo power requirements are respected.

Does the PCA9685 require separate servo power?
The module provides a dedicated V+ servo-power rail and screw terminal. An appropriate external supply is recommended for connected servo loads.

What is the default I²C address of PCA9685?
With its hardware address bits LOW, the default PCA9685 address is 0x40.

Can multiple PCA9685 boards be used together?
Yes. The PCA9685 provides hardware address selection, allowing multiple appropriately addressed devices to operate on the same I²C bus.

Is this module suitable for robotic arms?
Yes. Its 16 PWM channels make it suitable for multi-servo robotic arm projects when the servos and external power supply are appropriately selected.