Build a Smart Bathroom Occupied Indicator with Arduino Uno – Accurate PIR & Reed Switch Detection with LED Status

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

No more knocking on locked doors or guessing if the bathroom is occupied. This kit lets you build a wall-mounted LED indicator that shows red when the bathroom is in use and green when free, using a PIR motion sensor to detect presence and a reed switch on the door to confirm occupancy. It’s a practical project for smart homes, shared spaces, or even school STEM demonstrations.

What You'll Build

You’ll assemble a complete bathroom occupied indicator that mounts on the door or wall. When someone enters, the PIR sensor detects motion and the reed switch registers if the door is closed, turning on a red LED outside to show ‘occupied’. When they leave, it switches to green. It’s a real-world gadget that solves a genuine problem.

What You'll Learn

• How PIR motion sensors detect human presence and trigger digital signals
• Reading a reed switch (door magnetic contact) with Arduino for state detection
• Programming conditional logic in Arduino to combine two sensor inputs for accurate indication
• Wiring LEDs with current-limiting resistors and controlling them via digital pins

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Ideal for CBSE Class 9-12 students learning Arduino basics, ATL Tinkering Lab projects, or hobbyists building smart home gadgets. It’s also a great quick build for B.Tech first-year students exploring sensor integration.

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.