Build an Energy-Saving Occupancy Lighting System with Arduino Uno, PIR Sensor, and LDR

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 a room light that only turns on when you enter a dark space—and stays off when it’s bright or empty. This kit teaches you to build exactly that, combining a PIR motion sensor with light-dependent resistors (LDRs) to create an intelligent, energy-saving lighting controller. Ideal for home automation projects, it mimics the logic used in real-world corridor and office lighting systems.

What You'll Build

You’ll assemble a working circuit that reads motion from the HC-SR501 PIR and ambient light level from a pair of LDRs. A 5V relay module switches a bulb only when both conditions are met: person detected AND darkness. A 16x2 I2C LCD displays real-time sensor statuses, giving you visual feedback as you fine-tune the dual-condition logic.

What You'll Learn

• Interface PIR and LDR sensors with Arduino, reading digital and analog inputs
• Program a logical AND condition to trigger a relay based on multiple sensor states
• Drive an I2C LCD to display motion alerts and live LDR readings
• Design a fail-safe circuit with a flyback diode for relay protection

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

This intermediate kit fits CBSE Class 11-12 students building sensor-integrated physics or computer science projects, B.Tech ECE/EEE undergraduates prototyping automation systems, and teams in Smart India Hackathon or ATL Tinkering Labs. It’s equally relevant for hands-on learning at IIT, NIT, VIT, and BITS Pilani, offering a direct application of embedded C and circuit design.

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.