Arduino project · Water and plants · Easy
Water Level Monitor with LCD
The LCD shows the tank level and the buzzer warns when it is almost empty.
What you will learn
- How a water level sensor works
- How to display a level
- Why a low alarm helps
How it works
Every 300 ms the level is shown on the LCD. Below 15 percent the buzzer sounds.
Try this next
- Add a full alarm.
- Add a pump relay.
- Add a green and red LED.
The simulator program and explanation on this page are original. The idea follows a classic Arduino project that students have built for years.
Parts: sensors and actuators (tap to show or hide)
Try the inputs (virtual sensors)
Pins (you can change them)
| Part | Arduino pin (change it here) | How to wire it |
|---|
Every wire, one by one
Red rail = 5 V from the Arduino 5V pin. Black rail = GND. The coloured wires carry signals. Match the wire colours on the drawing to this list.
| # | Colour | From (part and leg) | To |
|---|
Steps run from top to bottom, then start again. While the simulation runs, the active step is highlighted in green.
Quantities come from the parts you added. The store links open a search for that item on Robu.in, Amazon.in and ThinkRobotics, so you always see what is in stock today. Check the model, voltage and price before you order.
| # | Item | Qty | Search term | Buy / compare |
|---|
The PDF has the circuit sketch, pin table, every wire, sequence, full code, the parts list with store links, do’s and don’ts for each part, and the safety notes. The project file lets you come back and keep editing.
In the real world
A tank with a level alarm
Change the water level. The tank in the real scene fills or drains and the alarm rings at a dangerous level.
Tip: use the gold tab at the bottom of the circuit drawing to pull the real-world view up over the Arduino board. Your parts stay visible above it, so you can press a button and watch the real scene react.
- Level sensor = the water level
- Buzzer = the alarm