Water Tank Sentinel
Monitor water tank levels with ultrasonic distance sensing
Watch the circuit build itself: components drop in, wires connect, and the output comes alive.
Components
Everything you need for this project.
1x HC-SR04 ultrasonic sensor
1x Active buzzer
1x Green LED
1x Red LED
2x 220Ω resistors
6x jumper wires
How It Works
Ultrasonic distance measurement (HC-SR04), pulse timing, distance calculation, and mapping sensor readings to real-world units.
What You Build
Ultrasonic sensor on D1/D2, LEDs on D3/D4, buzzer on D5. Distance represents water level in a tank scenario.
African Context
Millions of households rely on water tanks. Community water projects in Tanzania, Ghana, and Mozambique deploy similar ultrasonic level sensors.
What You'll See
Moving a hand toward the sensor changes the "water level." Full tank = green LED; empty = red LED + buzzer alarm.