Optical Encoder Speed Sensor Kit: Measure Motor RPM in Real Time with Arduino Uno and OLED Graph

Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.

Imagine building your own digital tachometer that reads the exact RPM of a spinning motor shaft and plots it live on an OLED screen. This kit gives you hands-on experience with optical encoders, interrupt-driven pulse counting, and real-time data visualization — exactly the kind of project that demonstrates core concepts for CBSE physics practicals, B.Tech ECE mini-projects, or Smart India Hackathon hardware demos.

What You'll Build

You'll assemble a working speed measurement system: a DC motor with an optical encoder disc attached to its shaft, read by an LM393 sensor module. The Arduino Uno counts pulses using interrupts, calculates RPM, and displays a scrolling speed graph on a 0.96-inch OLED. A potentiometer lets you vary motor speed and watch the RPM change instantly. The final result is a compact, self-contained instrument that can be used to measure speeds of small motors or demonstrate feedback control.

What You'll Learn

• How optical encoders work and how to interface an LM393 comparator-based sensor for precise pulse detection
• Arduino interrupt programming to count encoder pulses without missing any, even at high speeds
• RPM calculation from pulse intervals and real-time graphing on an OLED using Adafruit SSD1306 libraries
• Motor driver control with an L298N and variable speed adjustment via a potentiometer (PWM)

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

This intermediate-level kit is perfect for CBSE Class 11–12 students exploring sensor-based projects, B.Tech ECE/EEE undergraduates doing their first motor feedback experiment, and participants in competitions like Smart India Hackathon who need rapid prototyping with reliable parts. ATL Tinkering Labs and hobby clubs will also find it an engaging way to teach embedded systems and data logging.

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.