Overview
The PCA9685 PWM servo motor driver is a 16-channel module designed for projects that require precise, multi-channel PWM control. Ideal for robotics, automation, animatronics, RC models, and LED control, this board provides high-frequency, stable PWM so servos move smoothly without jitter.
Key Features
- 16 Independent PWM Channels – Drive 16 servos or LED channels with individual timing and no conflicts.
- 12-bit Resolution – 4,096 steps per channel for fine-grained control and ultra-smooth motion.
- I2C Interface – Easy connection to Arduino, Raspberry Pi, and most microcontrollers; supports up to 1 MHz bus speed.
- Chainable Design – Connect up to 62 modules on one I2C bus for large-scale projects up to 992 outputs.
- Adjustable Frequency – PWM frequency adjustable up to about 1.6 kHz to match different servo or LED requirements.
- Built-in Oscillator – No external clock required, plug and start controlling quickly.
- Logic Level Compatible – Works with both 3.3V and 5V logic systems.
Product Specifications
- Model: PCA9685
- Channels: 16 independent PWM outputs
- Resolution: 12-bit (4,096 steps)
- Interface: I2C, up to 1 MHz
- Voltage Range: 3.3V to 5V logic compatible
- Operating Frequency: Adjustable up to ~1.6 kHz
- Chainable: Up to 62 modules on one bus
- Mounting Holes: Yes
- Dimensions: 6.3 x 2.5 cm
Why Choose This PCA9685 Servo Motor Driver
- Reduces jitter compared to standard microcontroller PWM outputs for reliable actuation.
- Fully documented with PCA9685 datasheet and abundant community libraries and examples.
- Perfect for multi-servo rigs, robotic arms, animatronics, drones, and complex LED installations.
- Compact form factor with mounting holes makes integration into projects simple and neat.
Applications
- Robotics and automation systems
- Animatronics and props
- Multi-servo control for robotic arms and legged robots
- LED dimming and lighting effects with PWM control
- Prototyping with Arduino and Raspberry Pi
Compatibility and Libraries
The module is compatible with Arduino and Raspberry Pi. Popular libraries include the Adafruit PWM Servo Driver library for Arduino and Python libraries for Raspberry Pi. Using these libraries simplifies setup and provides example code for servo sweep, precise angle control, and multi-channel sequencing.
Power and Wiring Tips
- Provide a separate power supply for servos when driving multiple motors to avoid brownouts on your microcontroller. Choose a supply that matches your servo voltage and current needs.
- Connect the module VCC to your logic voltage (3.3V or 5V) and the servo power supply to the module’s V+ terminal if available.
- Common ground between the microcontroller, module, and servo power supply is required for reliable signals.
- Adjust the PWM frequency to match the servo type for optimal performance; typical hobby servos work well near 50 to 60 Hz, but the PCA9685 allows higher frequencies for other devices.
Getting Started
- Install the recommended library on your Arduino or Raspberry Pi.
- Wire SDA, SCL, VCC, and GND between the module and your controller.
- Power servos from an appropriate external supply and share ground with the controller.
- Load an example sketch to test servo sweep and verify channel mapping and calibration.
What You Get
- 1 x PCA9685 16-channel PWM servo motor driver module
- Documentation and links to datasheet and example libraries
Final Notes
The PCA9685 PWM servo motor driver is a flexible, high-precision solution for expanding servo and PWM control beyond the limited pins on standard microcontrollers. Whether you are building a multi-servo robot or creating advanced lighting effects, this module makes complex PWM projects easier to manage and more reliable.
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