Servo Driver - 16 Channel 12 bit PWM I2C Interface PCA9685

Servo Driver - 16 Channel 12-Bit PWM I2C Interface (PCA9685) is an essential expansion module designed to control up to 16 servos or PWM devices simultaneously using only 2 microcontroller I2C pins. Built around the powerful PCA9685 controller IC, it offloads all PWM signal generation from the main processor, providing 12-bit resolution (4096 steps) per output channel for smooth, jitter-free servo motion and precise LED dimming. Featuring dedicated 3-pin headers (VCC, GND, Signal) for direct servo connection, an onboard terminal block for external power, and daisy-chain capability supporting up to 62 boards on a single I2C bus, it is the industry standard choice for complex robotics, bipedal walkers, robotic arms, and hexapods.

Features

• Controls up to 16 individual servos or PWM outputs using only two I2C lines (SDA and SCL)
• 12-bit hardware resolution providing 4096 step accuracy for smooth servo positioning and LED brightness tuning
• Free-running onboard clock allows the PCA9685 chip to generate continuous PWM signals without consuming microcontroller CPU cycles
• Standard 3-pin male headers arranged in groups of 4 for direct plug-and-play servo motor hookup
• Heavy-duty terminal block for connecting high-current external servo power supplies (up to 6V DC)
• Built-in 220-ohm series resistors on all output lines to protect signal pins and drive LEDs directly
• Daisy-chain address jumpers (A0 to A5) allowing up to 62 modules to be chained together on one bus for up to 992 PWM outputs
• Wide logic voltage compatibility (3.3V to 5V DC), making it natively compatible with Arduino, ESP32, ESP8266, and Raspberry Pi

Applications

• Multi-servo robotic arms, quadruped walkers, bipedal humanoid robots, and hexapod rovers
• Pan-tilt camera gimbal platforms and multi-axis tracking systems
• High-density LED lighting control, RGB strip dimming, and custom stage lighting animation
• Animatronics, automated mechanical props, and RC aircraft surface controllers
• Polytechnic diploma, university engineering thesis, and advanced Arduino/ESP32 robotics projects

Important Notes:

• External Power Required: Servo motors draw significant current when moving under load. Always power the servos via the screw terminal block (V+ and GND) using an external 5V–6V DC high-current power supply (e.g., 5V 5A adapter or Li-ion pack) rather than attempting to power them from the microcontroller or the 3.3V/5V logic pin.
• Frequency Configuration: Standard analog and digital servos expect a 50 Hz PWM refresh rate. Ensure your software library (Adafruit_PWMServoDriver) sets the PWM frequency to 50 Hz before enabling servo outputs.
• Common Ground: The module automatically ties external power ground (V-) and logic ground (GND) together on the PCB, ensuring signal integrity across connected microcontrollers.
• Capacitor Slot: An onboard mounting location is provided for soldering a large electrolytic capacitor (e.g., 470µF–1000µF 10V) across the external power rails to smooth out voltage dips caused by sudden servo motor startup current spikes.

Package includes

• 1 x PCA9685 16-Channel 12-Bit PWM Servo Driver Module