Adjustable PWM DC Motor Speed Controller Module – 4.5V to 35V User’s Guide
Product Overview
This module allows precise control of DC motor speed using Pulse Width Modulation (PWM). By adjusting the duty cycle with the onboard potentiometer, you can smoothly vary motor speed without sacrificing torque.
- Input Voltage: 4.5V – 35V DC
- Max Current: Typically 5A (continuous), up to 10A peak (depending on heatsinking)
- Control Method: Rotary potentiometer (knob)
- Output: PWM signal to motor load
- Applications: DIY electronics, robotics, RC vehicles, LED dimming, educational kits
Features
- Wide operating voltage range (4.5V–35V DC).
- High efficiency PWM control for smooth speed adjustment.
- Screw terminal connectors for easy wiring.
- Large electrolytic capacitor for stable operation.
- Compact PCB design with protective circuitry.
Installation & Wiring
Terminals:
- IN+ / IN- → Connect to DC power supply (battery or adapter).
- M+ / M- → Connect to DC motor leads.
Steps:
- Ensure power supply matches the motor’s rated voltage (within 4.5V–35V).
- Connect power supply wires to IN+ (positive) and IN- (negative).
- Connect motor wires to M+ and M-.
- Double‑check polarity before powering on.
- Turn the knob clockwise to increase speed, counter‑clockwise to decrease.
Safety Notes
- Do not exceed 35V DC input.
- Ensure motor current does not exceed module rating (use heatsink if needed).
- Always disconnect power before wiring.
- Avoid short circuits between terminals.
- Use proper gauge wires for high current loads.
Troubleshooting
| Issue | Possible Cause | Solution |
|---|---|---|
| Motor not running | Incorrect wiring / no power | Check connections and supply voltage |
| Motor runs only at full speed | Potentiometer damaged | Inspect/replace knob |
| Module overheats | Current too high | Add heatsink or use lower‑power motor |
| Motor speed unstable | Loose wiring or poor power supply | Tighten terminals, use regulated supply |
Package Includes
- 1 × Adjustable PWM DC Motor Speed Controller Module (4.5V–35V)
- 1 × Rotary knob (attached)