HiLetgo PCA9685 16-Channel PWM Servo Driver
16 servo channels over two I²C wires, with a dedicated servo power terminal.
Best for: Any arm with 3+ servos
🎛️ Controllers
Controllers & Servo Drivers
Driving more than a couple of servos straight from an Arduino quickly runs out of timers and clean PWM. A dedicated driver such as the PCA9685 gives you 16 channels of 12-bit PWM over a two-wire I²C bus, with a separate servo power rail so voltage sags do not reset your board. It is the single most useful upgrade for any multi-joint arm.
As an Amazon Associate we earn from qualifying purchases. Prices and availability are accurate as shown on Amazon at the time of purchase.
SunFounder PCA9685 16-Channel Servo Driver
PCA9685 driver from a known education brand — works with Arduino and Raspberry Pi.
Best for: Raspberry Pi arms
HUAREW PCA9685 16-Channel PWM Driver (2-Pack)
Two PCA9685 boards — keep a spare or chain them for 32 channels.
Best for: Large or dual-arm builds
Learn how to use these
Code & electronics
Arduino Robotic Arm Code: Sketches, Library & Examples
Copy-paste Arduino robotic arm code: Servo library setup, sweep tests, potentiometer and serial control, record/playback, smooth motion, and PCA9685.
Builds by platformArduino Robotic Arm: Build a 4-DOF Servo Arm (Wiring + Code)
Build a 4-DOF Arduino robotic arm with hobby servos. Full parts list, wiring diagram, power tips and copy-paste Arduino code to control it with potentiometers or serial commands.
Parts & hardwareHow to Power a Robotic Arm (Without Frying Your Board)
Pick the right robotic arm power supply, size current from servo stall draw, wire a common ground, and stop brownouts that reset your Arduino or Pi.