Waveshare 16-channel 16-bit PWM Servo Controller for Raspberry Pi Pico (model WSR-19721)

The Waveshare 16-channel 16-bit PWM Servo Controller for Raspberry Pi Pico is an expansion board that provides independent PWM outputs across 16 channels for precise servo positioning and PWM motor control. Designed to interface directly with a Raspberry Pi Pico, the controller implements 16-bit resolution PWM timing to deliver fine-grained pulse width control suitable for standard and digital servos, LED dimming, and other PWM-driven devices. The compact module is intended for robotics, RC models, automation tasks and prototype systems where multiple channels must be driven simultaneously from a Pico single-board computer.

Advantages

The controller offers 16 independent channels with 16-bit PWM resolution, enabling accurate and repeatable positioning of servos and smooth motor speed regulation. Its compatibility with Raspberry Pi Pico simplifies integration into Pico-based projects, and the separate power input option allows safe powering of high-current servos without loading the Pico. The module’s high resolution and multiple outputs reduce the need for external multiplexers or additional microcontrollers when managing many actuators.

Suitable for

• Multichannel robotic arms and legged robots
• RC models requiring multiple servos (planes, helicopters, cars)
• Automation projects needing synchronized PWM outputs
• Prototyping of PWM-driven lighting and motor control circuits

Key specifications

• PWM channels: 16 independent outputs
• PWM resolution: 16-bit timing for fine pulse-width control
• Interface: compatible with Raspberry Pi Pico GPIO control
• Power: separate servo power input supported to supply higher currents
• Form factor: compact expansion board designed for Pico integration

How to use

Connect the controller to the Raspberry Pi Pico according to the Pico’s GPIO pinout and the module’s documentation, ensuring correct orientation of headers. Provide a suitable power supply to the module’s servo power input when driving multiple or high-current servos, and connect grounds between the Pico and the controller. Use the recommended driver library or example code for the Pico to initialize the controller, set PWM frequency, and write pulse widths for each channel. Verify servo endpoints and safe ranges before full operation to prevent mechanical strain.

Usage recommendations

Use a dedicated power supply sized for the total stall current of all servos, enable common ground between the Pico and the controller, and start with conservative pulse width limits when calibrating servos. Keep wiring neat and use decoupling capacitors or recommended filtering if you observe voltage dips under load.