Hall Effect Magnetic Sensor Starter Kit Kit with Arduino Uno + Sensor
Spin It, Count It – Hall Effect Magnetic Sensor Starter Kit with Arduino Uno
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Want to measure rotation speed without touching a spinning wheel? This kit transforms a simple magnet and sensor into a live RPM display. Attach a magnet to a fan blade, motor shaft, or even a fidget spinner, hold the A3144 Hall sensor nearby, and the LCD instantly shows revolutions per minute. It’s a hands‑on introduction to contactless sensing — the same technology used in car ABS systems and factory conveyor belts.
What You'll Build
A standalone RPM counter that detects each magnet pass and updates the LCD in real time. You’ll calibrate the sensor distance, write the counting logic, and see RPM rise as you spin faster. Once assembled on the breadboard, you can take it anywhere — a portable tachometer for mini motors, windmills, or any rotating object with a small magnet.
What You'll Learn
- How a Hall effect sensor switches state when a magnetic field crosses its face
- Reading digital pulses on Arduino’s pin using interrupt or polling approaches
- Interfacing a 16x2 LCD via I2C backpack to show live numerical readings
- Debouncing techniques and RPM calculation from pulse intervals
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| A3144 Hall Sensor | 1 |
| 16x2 LCD | 1 |
| I2C Backpack | 1 |
| 10kΩ Resistors | 5 |
| 400-pt Breadboard | 1 |
| M-M Wires | 20 |
| 9V Battery Snap | 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
Young makers curious about sensors and magnetism will love seeing numbers change with motion. It fits perfectly into ATL Tinkering Labs for ages 10‑15 and CBSE Class 11‑12 physics lab projects on Hall effect. B.Tech ECE/EEE students can use it as a quick prototype before scaling to higher‑speed encoders. Even hobbyists and IIT/NIT/VIT/BITS teams building a Smart India Hackathon prototype will find this a fast way to add non‑contact rotation feedback.
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?
Our AI companion guides you step‑by‑step, and you can message us on WhatsApp for real‑time troubleshooting — no more hunting through forums.
How does the sensor detect a magnet?
The A3144 contains a Hall element that toggles its output when a magnetic field exceeds a threshold. A neodymium disc magnet works best; the kit’s 10kΩ pull‑up ensures clean digital pulses to the Arduino.
Can I measure RPM of a high‑speed motor?
Yes, but keep magnet passes below ~20,000 pulses per minute for reliable counting. For high‑RPM applications, you can later swap in a Hall latch with faster response, using the same breadboard wiring.
Will this work without an external magnet?
You need a small magnet; the kit does not include one. Any fridge magnet or inexpensive neodymium magnet works — attach it to the rotating object with tape, then position the sensor 2‑5 mm away.
A3144 Hall sensor detects magnetic field and counts magnet passes. Shows RPM of spinning magnet 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