Arduino project · LEDs and lights · Easy
Traffic Light with Pedestrian Button
Cars get a green light until a pedestrian presses the button, then yellow, then red while people cross.
What you will learn
- How "wait until" holds the program for an input
- How to run lights in a safe order
- How a button is wired with INPUT_PULLUP
How it works
The green LED stays on and the program waits at the "wait until" step. When Button1 is pressed it switches to yellow for 2 seconds, then to red for 5 seconds. Then the loop starts again with green.
Try this next
- Add a flashing green for the last second of the pedestrian time.
- Add a buzzer that beeps while the light is red.
- Change the red time to 10 seconds.
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 pedestrian crossing on a real road
This is the same program on a real road. The cars, the lights and the walking people follow your three LEDs and your button.
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.
- Green LED = green light: cars go
- Yellow LED = yellow light: cars get ready to stop
- Red LED = red light: cars stop and people cross
- Button = the pedestrian push-button