Hand Washing Timer Variant 13 Kit — Build a Melody-Playing 20-Second Timer with Arduino Nano and IR Sensor

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

Proper hand washing requires a full 20 seconds—but kids (and adults) often rush. This kit lets you build a compact timer that starts when a soap dispenser's IR sensor detects a hand, playing a cheerful melody for exactly 20 seconds until hands are clean. Perfect for homes, schools, and health-awareness projects that teach hygiene through hands-on electronics.

What You'll Build

A battery-powered timer module that can be placed next to any standard soap dispenser. The IR proximity sensor detects a hand reaching for soap and triggers the Arduino Nano to light two green LEDs and play a melody through a passive buzzer for 20 seconds. You will wire the circuit on a breadboard, upload the provided code, and mount the sensor near the dispenser nozzle. The build fits easily into a small cardboard or 3D-printed enclosure you can customize.

What You'll Learn

• Wiring an IR proximity sensor and reading its digital output
• Programming an Arduino Nano to run a timed sequence and generate tones
• Using a passive buzzer to play musical notes and melodies
• Prototyping on a breadboard and powering a circuit with a 9V battery

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

This kit is ideal for students of CBSE Class 5–10 working on hygiene and health projects, ATL Tinkering Lab members exploring sensor-based automation, and B.Tech ECE/EEE first-year students looking for a quick Arduino project. Parents homeschooling their children will also find it a fun way to combine electronics and life skills.

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.