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GPIO Project 3 - Traffic Light

Beginner
30 Minuten
€167.09

In this project you will learn how to use multiple LEDs to simulate a traffic light. Each LED is controlled via a separate GPIO pin, and you program the logic of a traffic light.

Connection diagram

  1. Connect the red LED:
    • Long leg (anode): Connect this to GPIO 17 (pin 11).
    • Short leg (katode): Connect this toGND (ground) via a jumper wire .
  2. Connect the yellow LED:
    • Long leg (anode): Connect this to GPIO 27 (pin 13).
    • Short leg (cathode): Connect this toGND (ground) using a jumper wire.
  3. Connect the green LED:
    • Long leg (anode): Connect this with GPIO 22 (pin 15).
    • Short leg (cathode): Connect this toGND with a jumper wire.

Pinout Reference

GPIO

Pin #

LED color

Function

GPIO 17Pin 11RedControl red LED
GPIO 27Pin 13YellowControl yellow LED
GPIO 22Pin 15GreenControl green LED
GNDPin 6All LEDsEarth/ground connection

Python-Code in Thonny

  1. Start Thonny: Click on the Raspberry Pi menu > Programming > Thonny Python IDE.
  2. Write your code: Create a new file in Thonny and enter the following code:
from gpiozero import LED
from time import sleep

# LED's koppelen aan GPIO-pinnen
red = LED(17)    # Rode LED op GPIO 17
yellow = LED(27) # Gele LED op GPIO 27
green = LED(22)  # Groene LED op GPIO 22

# Verkeerslicht simulatie
while True:
    # Rood licht
    red.on()
    yellow.off()
    green.off()
    sleep(3)

    # Rood en geel samen (overgang)
    red.on()
    yellow.on()
    green.off()
    sleep(1)

    # Groen licht
    red.off()
    yellow.off()
    green.on()
    sleep(3)

    # Geel knipperend (waarschuwing)
    red.off()
    yellow.on()
    green.off()
    sleep(1)
    yellow.off()
    sleep(1)
  1. Save the file: Click on File > Save As and name the file traffic_light.py.
  2. Run the script: Click on the green Run button (▶) at the top of the Thonny interface.

How does it work?

  • red.on(), yellow.on() , green.on(): Controls the respective LEDs to flash.
  • sleep(x): Pauses the program for x seconds between actions.
  • Order:
    1. Red light stays on (stop).
    2. Red and yellow light up together (preparation).
    3. Green light turns on (driving).
    4. Yellow light flashes (warning).< /span>

Result

If everything is connected correctly and the script is executed correctly, the traffic light will mimic the standard sequence of red, yellow, green.

Experimenting

  • Adjust Timing: Change the values ​​of sleep(x) to change the duration of each light.
  • Multiple Traffic Lights: Add a second set of LEDs to simulate multiple traffic lights.

Required products