Yahboom 8-Channel PWM Servo Control Debugging Board, 5-8.4V Knob Tester for DIY Robotics

Overview

Yahboom 8-channel PWM servo control debugging board is a plug-and-play servo controller for DIY smart robotics. It provides 8-channel independent servo interfaces for debugging/testing servos powered from 5V–8.4V, with on-board knobs and buttons for control (no code required). The board uses an STC8G2K64S4 chip and high-precision potentiometers, and supports both manual adjustment and servo centering.

Key Features

• 8-channel independent servo interface with 8 high-precision potentiometers (one-to-one synchronous control).
• No programming required; control servos using the adjustable knobs and function keys.
• 2 control modes: Manual mode and Centering mode (one-key centering to 90°).
• On-board 8-bit MCU generates high-resolution PWM signals for precise control.
• Servo control accuracy: 0.09 degrees (PWM limit small change value 1 us).
• Control cycle: 20 ms; pulse width: 0.5 ms–2.5 ms.
• KF301-2P / KF301 terminal block power input (5V–8.4V), suitable for lithium batteries or power modules.
• Protection: anti-reverse connection protection and overcurrent protection (S1–S4 protection group, S5–S8 protection group; over 2A protection).
• 4 brick holes reserved; fixing hole diameter is marked as 4.8 mm.

Specifications

How to Use

1. Supply power to the controller. Input voltage can be 5V–8.4V (use a voltage suitable for the servo’s rated voltage).
2. After power-on, the LED at the MCU position lights up and flashes twice in 5 seconds (blue LED).
3. Plug the servo into the 3-pin servo interface: “+” is positive, “-” is negative, and “S” is the signal terminal.
4. Turn the knob; the servo rotates synchronously.
5. Use the button below the knob to switch modes:
   • Centering Mode: returns to the center position; red LED off; blue LED on.
   • Manual mode: knob control; blue LED off; red LED on.

Power Supply Notes

• Lithium battery powered: suitable for conventional 6V–8.4V high-voltage servos.
• Lithium battery power supply module: suitable for conventional 5V standard servos.
• Because servos can draw high current, ensure the power supply current is sufficient. If the power indicator light flashes during rotation, the servo rotates uncontrollably, or the error is obviously too large, the power supply current may be insufficient.

Applications

• Robotic arm test / control
• Mechanical claw test
• Servo testing and centering
• Model control and creative DIY projects

Manuals

Tutorials Link: 8-channel PWM servo control debugging board

This product is a hardware debugging accessory, with no software and data included. For wiring or troubleshooting help, contact support@rcdrone.top or visit https://rcdrone.top/.

Details

Plug-and-play 8-channel servo debugging board with independent knob control and 5–8.4V power input for quick bench testing.

Switch between manual knob control and one-key centering to return connected servos to a 90° position without writing code.

Power the board from a 5–8.4V source, including lithium packs or a regulated supply module matched to your servo voltage.

Ideal for robotics prototyping, letting you verify servo direction and range before integrating with a main controller.

Clear labeled layout for fast wiring: servo headers, power input, status LEDs, and grouped protection for channels S1–S4 and S5–S8.