PIR Outdoor Floodlight Timer Kit with Arduino Uno & LDR – Automatic Night Security Light

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

Outdoor security lights that stay on all night waste power and create light pollution. This kit solves that by building a smart floodlight controller that activates only when motion is detected and only after dark. The HC-SR501 PIR sensor triggers a 12V relay for exactly two minutes, while a separate LDR circuit blocks all triggers in daylight, so the light never turns on during the day. It is a complete, field-ready security automation project that you can install outside a home, garage, or school entrance.

What You'll Build

A fully functional PIR-based outdoor floodlight timer that wires directly to a 12V floodlight. You will assemble the sensor board, program an Arduino Uno to manage the 2-minute timer logic, and integrate a daylight-blocking LDR to save energy. The finished build mounts easily and works reliably in real Indian outdoor conditions.

What You'll Learn

• How to interface a PIR sensor and read its digital trigger signal on Arduino
• Using a relay module to switch a high-current 12V load safely
• Reading an LDR with a voltage divider to create a day/night threshold
• Writing Arduino timer logic that ignores motion in daylight and resets on each new trigger

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

This intermediate kit is ideal for CBSE Class 11–12 students building physics or computer science projects that combine sensors and real-world loads. B.Tech ECE/EEE students working on embedded systems or security automation will also find it directly aligns with semester projects. ATL Tinkering Labs and Smart India Hackathon teams can use this as a core module for outdoor surveillance prototypes that need reliable light 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.