PWM Fan Controller with RPM
Arduino PWM Fan Controller with RPM – Adjust Speed, Read RPM on LCD
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Twist a knob and watch a 12V PC fan spin faster or slower, while a 16x2 LCD shows the exact revolutions per minute—measured in real time by a magnetic Hall sensor. This kit turns Arduino into a closed-loop motor controller, giving you a working tachometer and a tangible introduction to sensor-driven automation.
What You'll Build
You’ll wire the fan, potentiometer, and Hall sensor on a breadboard, upload PWM control code to the Arduino Uno, and mount the sensor to detect blades passing by. The RPM updates live on the LCD, letting you verify how pot twist directly changes fan velocity. It’s a complete motor speed measurement system from scratch.
What You'll Learn
- Write Arduino code that generates PWM signals and varies fan speed.
- Interface a Hall effect sensor to detect magnetic pulses from fan blades.
- Display real-time data on a 16x2 LCD using I2C communication.
- Convert Hall sensor pulses into accurate revolutions per minute (RPM).
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| 12V PC Fan | 1 |
| A3144 Hall Sensor | 1 |
| 10kΩ Potentiometer | 1 |
| 16x2 LCD | 1 |
| I2C Backpack | 1 |
| 10kΩ Resistors | 5 |
| 100nF Caps | 5 |
| 400-pt Breadboard | 1 |
| M-M Wires | 20 |
| 12V Adapter | 1 |
Why Buy This Kit Instead of Sourcing Parts Separately
| Factor | Sourcing Separately | Compoden Kit |
|---|---|---|
| Compatibility checks | You verify every part | Pre-tested as a system |
| Build support | Forums and scattered tutorials | AI companion trained on this exact project |
| Time to first working build | Days of debugging | Hours, with step-by-step guidance |
| Shipping coordination | Multiple sellers, multiple delays | One shipment from Bengaluru in 3-5 days |
Who This Kit Is For
This kit fits CBSE Class 5–10 students exploring STEM, ATL Tinkering Lab members, and young makers attending robotics hobby clubs across India. It’s also an ideal first project for anyone curious about how PWM and sensors work together in real-world motor control.
Built and Backed by Compoden
Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.
What if I get stuck during the build?
Scan the QR code to launch the AI companion, which guides you step by step with text and diagrams. You can also reach us on WhatsApp for human assistance within working hours.
Do I need to solder anything?
No soldering required. All connections are made on the breadboard using jumper wires; components plug in directly.
Can I run the fan without a computer once programmed?
Yes. After uploading the code via USB, the Arduino can run standalone using the included 12V adapter. The LCD will keep showing RPM.
Why is my RPM reading sometimes off by a few counts?
The Hall sensor needs stable alignment with the fan blades. The AI companion includes placement tips and a simple calibration routine to eliminate false pulses.
PC fan speed via PWM potentiometer. Hall tachometer reads actual RPM displayed on LCD.
What's in this kit
Other projects you can build
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items