Office Occupancy Tracker Kit with Arduino Nano & LDR — Build a Motion-Activated Under-Rim Night Light for Smart Bathrooms

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

Office bathrooms need subtle, automatic lighting that doesn't blast you awake during late-night visits. This kit lets you build a motion-sensitive LED ring that fits discreetly under the toilet rim. As soon as someone walks in, the PIR sensor detects movement, the LDR checks that it's dark, and the 12-LED WS2812B ring glows softly for 60 seconds — no switches, no glare, just smart, hands-free illumination.

What You'll Build

A fully functional motion-activated night light ready to install under a toilet rim. The moment someone enters the room at night, the ring lights up in a preset colour or pattern, providing just enough light to navigate without disturbing the original ambience. It automatically turns off after 60 seconds, saving power and extending LED life.

What You'll Learn

• Calibrate an HC-SR501 PIR sensor for precise motion detection range and timing
• Read an LDR (light-dependent resistor) to differentiate day from night using Arduino analog input
• Control a WS2812B addressable LED ring — setting colours, brightness, and patterns via code
• Assemble a sensor circuit on a breadboard and manage power with a regulated 5V supply

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Designed for ATL Tinkering Lab students (Class 6–10) exploring sensor‑based automation, CBSE Class 11–12 students building a physics or computer science practical project, and B.Tech ECE/EEE first‑years who need a ready‑to‑assemble mini‑project for Smart India Hackathon or college submissions. Even hobbyists at IIT, NIT, VIT, and BITS will appreciate the plug‑and‑play simplicity of this smart‑living gadget.

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.