Build a Litter Bin Fill Detector with Micro:bit — Know Exactly When It’s Full

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

How often do you open the dustbin just to check if it’s time to empty it? This kit turns that everyday curiosity into a real working gadget. You’ll mount an HC-SR04 ultrasonic sensor above or inside a bin, wire it to a BBC micro:bit v2, and write a simple MakeCode program that shows the fill level on the LED grid. When trash reaches the top, the micro:bit flashes a warning and scrolls “Bin Full!” — a satisfying, practical build that solves a small home problem.

What You'll Build

You’ll create a compact detector that sits on a half breadboard near any bin. The ultrasonic sensor pings sound waves downward; the micro:bit measures the echo time and converts it to a distance. That distance is displayed as a bar-graph — more LEDs light up as the bin fills. When the bin is nearly full, the display clears and a scrolling message appears, so even young siblings or grandparents know it’s time to take out the trash.

What You'll Learn

• How ultrasonic distance sensors work — sending and receiving sound pulses
• Reading sensor data using makecode blocks and variables
• Mapping real-world distances to an LED display
• Setting up conditional alerts (if bin height < 10 cm, sound alarm)

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

This kit is designed for curious young makers aged 8–10 who enjoy seeing their code come to life. It’s a favorite in ATL Tinkering Labs, CBSE school maker spaces, and home-schooling setups because it blends environmental awareness with sensor basics. Parents looking for a screen-time activity that builds logic and creativity will find the clear instructions and crocodile-clip assembly ideal for first-time builders.

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.