Motor Tachometer with LCD
Arduino Motor Tachometer with LCD Kit – See Your Motor’s RPM in Real-Time
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Spin a DC motor and watch its exact RPM appear on a bright 16x2 LCD. With the LM393 speed sensor counting pulses from the motor shaft, you’ll build a tachometer that introduces the fundamentals of motion sensing and microcontroller feedback—best of all, everything just works together. This kit turns a simple idea into a device you can attach to any motor and understand how speed is measured in real engineering tools.
What You'll Build
A standalone RPM meter that reads the speed of a 5V DC motor and displays it on an LCD screen. You’ll wire the LM393 sensor to detect the motor’s rotation, feed pulse data to the Arduino, and code the logic to calculate RPM from time intervals. The result is a neat, portable gadget you can adapt to any motor project.
What You'll Learn
- How an optical speed sensor (LM393) detects rotation using an encoder disc
- Wiring and controlling a DC motor safely with an L298N motor driver
- Reading pulse signals and converting them to RPM in Arduino code
- Displaying dynamic numbers on a 16x2 LCD via I2C backpack
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| LM393 Speed Sensor | 1 |
| DC Motor 5V | 1 |
| L298N Driver | 1 |
| 16x2 LCD | 1 |
| I2C Backpack | 1 |
| 10kΩ Resistors | 5 |
| 400-pt Breadboard | 1 |
| M-M Wires | 25 |
| 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
This kit is perfect for students from Class 5 to 10 who want a hands-on physics or computer science project. ATL Tinkering Labs across India will find it an engaging tool to teach sensors and automation. Parents looking for a screen-free learning activity that actually works will appreciate the guided experience.
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?
Open the QR code on the box to start the AI build companion—it knows every wire and line of code for this exact kit. You can also message us on WhatsApp for a direct hint.
How do I power the kit? Do I need a separate power supply?
The included 9V battery snap powers the Arduino and motor driver; just plug in a 9V battery (not included). No separate adapter is required.
Can I measure RPM of my own motor?
Yes, the LM393 sensor can be attached to any motor with an encoder disc or reflective marker. Once you understand the setup, you can adapt it easily.
Is soldering required?
No soldering. All connections use the breadboard and jumper wires, making it completely reusable and safe for young builders.
LM393 encoder on motor shaft counts pulses. LCD shows RPM calculated from pulse intervals.
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