Build Your Own Water Tank Overflow Preventer with Arduino Uno & Ultrasonic 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.

Water tanks that overflow waste hundreds of litres each week and can damage roofs or walls. This kit lets you construct a reliable system that uses an HC-SR04 ultrasonic sensor to continuously measure the water level and a 5V relay to shut off a solenoid valve or pump motor the moment the tank reaches full capacity. It's a practical home automation project that solves a real Indian household problem.

What You'll Build

You'll create a working automatic water level controller. The ultrasonic sensor sits at the top of the tank, sending pulses downward. When the Arduino detects the distance equivalent to a full tank, it triggers the relay to close the inlet valve. Green and red LEDs indicate power and valve status at a glance. The circuit runs on a 9V battery, so it's portable and safe to test without mains wiring.

What You'll Learn

• Interface an HC-SR04 ultrasonic sensor with Arduino Uno and convert raw echo pulses into accurate centimetre readings
• Program logical decisions based on real-time distance thresholds to prevent false triggers
• Control a 5V relay module to safely switch external devices like solenoid valves or pumps
• Integrate visual feedback using LEDs and protective diodes, understanding flyback protection with 1N4007 diodes

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

CBSE Class 11-12 students assembling a working model for computer science or physics practicals. B.Tech ECE/EEE first-years prototyping an automation project for Smart India Hackathon or a semester mini-project. ATL Tinkering Lab facilitators who need a ready-made kit that demonstrates sensor-actuator integration in a real-world context. The project also suits IIT, NIT, VIT, and BITS Pilani students experimenting with embedded systems and IoT concepts.

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.