2-Channel Servo Motor Tester with Voltage Display – PWM Knob Controller 5–8.4V
The 2-Channel Servo Motor Tester with Voltage Display is a compact, standalone PWM servo controller designed for precise manual control and testing of compatible RC servo motors.
Featuring a high-precision rotary potentiometer, dual servo outputs, and a built-in digital voltage display, this controller allows users to adjust servo positions without programming or using an Arduino.
Operating from 5V to 8.4V DC, the board is suitable for robotics, robot arms, grippers, servo calibration, and electronic prototyping.
Key Features
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2-Channel Servo Control: Connect and control two compatible PWM servo motors simultaneously.
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Precision Rotary Knob: Manually adjust servo position using the built-in potentiometer.
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Digital Voltage Display: Monitor the connected power supply voltage in real time.
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Wide Operating Voltage: Supports 5V to 8.4V DC.
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High-Resolution PWM Control: Provides fine adjustments to servo positioning.
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Built-in Microcontroller: Uses an onboard 8-bit MCU for PWM signal generation.
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Servo Reset Function: Supports servo position reset through the onboard controls.
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Standalone Operation: No Arduino, ESP32, or external programming required.
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Compact Design: Suitable for robotics workshops and portable testing applications.
Technical Specifications
| Parameter |
Specification |
| Product Type |
Servo Motor Tester / PWM Controller |
| Number of Channels |
2 |
| Operating Voltage |
5–8.4V DC |
| Control Method |
Rotary Potentiometer |
| Output Signal |
PWM Servo Control Signal |
| Display Type |
Digital Voltage Display |
| Microcontroller |
Onboard 8-bit MCU |
| PWM Adjustment Resolution |
1µs (manufacturer-listed) |
| Positioning Accuracy |
Up to 0.09° (claimed; servo-dependent) |
| Servo Reset |
Supported |
| Dimensions |
Approx. 50 × 35mm |
| Weight |
Approx. 13.5g |
| Programming Required |
No |
Pin Configuration and Connections
| Connection |
Function |
| Power Input (+) |
Positive DC Supply (5–8.4V) |
| Power Input (-) |
Ground |
| Servo Channel 1 |
PWM Servo Motor Connection |
| Servo Channel 2 |
PWM Servo Motor Connection |
| Rotary Knob |
Manual Servo Position Adjustment |
| Digital Display |
Power Supply Voltage Monitoring |
How to Use
- Connect a compatible PWM servo motor to Channel 1 or Channel 2.
- Check the signal, positive, and ground pin orientation.
- Connect a regulated 5–8.4V DC power supply to the board.
- The digital display shows the supply voltage.
- Rotate the control knob to adjust the servo position.
- Connect a second servo to test both channels simultaneously.
- Use the onboard reset function when required.
Note: Both servo channels are controlled by the same adjustment knob. They are not independently programmable outputs.
Applications
- Servo Motor Testing
- Robotic Arm Development
- Robot Gripper Control
- Servo Calibration and Positioning
- RC Model Testing
- Robotics Prototyping
- Educational Electronics
- Mechanical Movement Testing
- DIY Automation Projects
Important Notes
- The controller is designed for compatible standard PWM servo motors.
- Servo motors are not included.
- The operating voltage range of the controller is 5–8.4V DC; always respect the voltage rating of the connected servo motors.
- For example, a 4.8–6V servo should not be supplied with 8.4V.
- Use a power supply capable of delivering sufficient current for the connected servos.
- Check power supply polarity before connecting.
- The voltage display monitors the supply voltage; it does not measure servo torque or current.
- Actual positioning accuracy depends on the connected servo motor and mechanical load.
- The board does not support independent control of the two servo channels.
- Not suitable for serial bus servos or stepper motors.
Package Includes
