Traffic light controller: Build a Traffic Light Controller That Can Be Used To Control The Flow of Traffic at An Intersection

Here is a basic code for a traffic light controller using an Arduino board:

Hardware and electronic items required:

• Arduino board (e.g. Arduino Uno)
• Three LEDs (one red, one yellow, and one green)
• Three 220 Ohm resistors
• Breadboard (optional, for prototyping)
• Jumper wires

Circuit diagram:

How to connect the hardware components:

1. Connect the positive (+) terminal of each LED to a digital pin on the Arduino board (red LED to pin 8, yellow LED to pin 9, and green LED to pin 10).
2. Connect the negative (-) terminal of each LED to the negative rail of the breadboard.
3. Connect the positive (+) terminal of each resistor to the positive terminal of the corresponding LED.
4. Connect the negative (-) terminal of each resistor to the negative rail of the breadboard.
5. Connect the positive (+) terminal of the negative rail of the breadboard to GND on the Arduino board.

Note: The pin connections may vary depending on the type of LEDs you use. Make sure to consult the datasheets for the specific components you are using.