Arduino project · Buttons and switches · Easy
Three Buttons, Three LEDs
Each button controls its own LED. Press two buttons and two LEDs light.
What you will learn
- How several inputs can be checked in one loop
- Why each input needs its own pin
- How to keep your wiring tidy with colours
How it works
The loop has three if / else steps, one per button. Each one only affects its own LED. Because the loop runs thousands of times per second, the lights follow your fingers instantly.
Try this next
- Make Button3 turn all LEDs off.
- Turn the buttons into toggle switches (needs a variable in real code).
- Add a buzzer that beeps when all three are held.
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 button-controlled light board
Press the buttons in the simulator. The bulbs on the board follow.
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.
- Buttons = your commands
- LEDs = the bulbs