Arduino project · Light sensing · Easy
Study Desk Light Checker
Red if the light is too dim for reading, green if it is bright enough.
What you will learn
- Why good light matters for eyes
- How to use a limit
- How to read a lux sensor
How it works
Below 300 lux the red LED is on. Above it the green LED is on.
Try this next
- Add a buzzer.
- Add a dimmable lamp that tops up the light.
- Change the limit for drawing work (500 lux).
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
Is there enough light to study?
Green means there is enough light for reading, red means too dark.
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.
- Lux sensor = light on the desk
- Green / red LED = enough / too dark