Seeing people cross the street near my house made me curious about traffic lights, so I decided to build my Traffic Light System project with an Arduino Uno. I wanted to use a motion sensor to make the lights change when someone’s near, just like real ones do sometimes. It’s been fun learning how to mix sensors and lights to make something useful!

I set up my Arduino Uno with a PIR sensor to notice when something moves close—like a person or a toy car—and connected red, yellow, and green LEDs with resistors to keep them safe, plus a buzzer for sound. When the PIR sensor detects motion, my code starts the lights: red comes on first with a buzz to stop, then yellow with another buzz to get ready, and green with a final buzz to go. It waits a bit between each light, and I made the buzzer beep to help it feel like a real traffic signal.

I’m excited to make this project even better later! Maybe I can add a little screen to show “WALK” when the green light’s on, or make the buzzer beep faster if more motion happens. I could also try using two sensors for different directions. I’m happy I’m learning how sensors and LEDs work with my Arduino Uno, and I can’t wait to show my friends how my traffic light changes when I wave my hand!