Arduino project · Water and plants · Easy
Water Clarity Indicator (Turbidity)
Green for clear water, yellow for a little cloudy, red for muddy.
What you will learn
- What turbidity is
- How light shows how clear water is
- How to set three zones
How it works
Below 20 percent cloudy the green LED lights. Between 20 and 60 the yellow LED lights. Above 60 the red LED lights.
Try this next
- Add a buzzer for muddy water.
- Add a pump that stops when water is muddy.
- Show the number on a digit.
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
Clear or muddy water?
Raise the turbidity. The water turns cloudy and the lamps change from green to red.
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.
- Turbidity sensor = how cloudy the water is
- LEDs = clear / cloudy / dirty