Build a Smart Water Tank with Automatic Lid and Level Monitor — BBC Micro:bit & Ultrasonic Kit

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

Imagine a water tank that shows you exactly how much water is left and opens its lid the moment you wave your hand — no switches, no touching dirty surfaces. With this BBC Micro:bit kit, your young inventor will assemble a working model that combines distance sensing, servo motion, and real-time display feedback on a mini breadboard. It’s a practical intro to smart home ideas, perfectly sized for science fairs, tinkering labs, or a weekend build that actually does something useful.

What You'll Build

You’ll wire the HC-SR04 ultrasonic sensor to face down into a model tank (a small box or jar), while the servo motor attaches to a cardboard lid. The Micro:bit’s LED matrix displays tank status — empty, half, or full — based on the distance the sensor measures to the water surface. When your hand comes within a few centimetres of the sensor, the code instantly drives the servo to flip the lid open, then closes it after a set delay. It’s a complete, hands‑free water dispensing point powered by a little logic you can tweak and understand.

What You'll Learn

• Programming a Micro:bit to read an ultrasonic distance sensor and control a servo motor
• Calibrating an HC-SR04 sensor for reliable water level detection (empty, mid, full)
• Using servo angles to create mechanical lid movement triggered by proximity
• Building a complete feedback system that shows action (LED display) and physical output together

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Young explorers aged 8-10 who want a project that feels like a real appliance, not just blinking lights. It’s ideal for CBSE Class 5-8 science projects, ATL Tinkering Lab introductions, or a parent-child build on a rainy afternoon. The automatic lid and level display mirror concepts used in actual water management systems, giving kids a taste of IoT logic while staying firmly in the beginner’s comfort zone.

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.