LED Sequence Project

This project demonstrates how to control a sequence of LEDs using an Arduino. The LEDs will light up in a pattern, first from the lowest pin to the highest and then back from the highest pin to the lowest.

Components Required

• Arduino board (e.g., Uno, Nano)
• 6 LEDs
• 6 resistors (220 ohms each)
• Breadboard
• Jumper wires

Circuit Diagram

1. Connect each LED to one of the following digital pins: 2, 3, 4, 5, 6, and 7 on the Arduino.
2. Connect the longer leg (anode) of each LED to the corresponding pin.
3. Connect the shorter leg (cathode) of each LED to one end of a 220-ohm resistor.
4. Connect the other end of each resistor to the GND (ground) pin on the Arduino.

Code Explanation

Variables

• int timer = 100;: This variable controls the delay time between LED transitions. A higher value results in slower LED sequences.
• int ledPins[] = {2, 7, 4, 6, 5, 3};: This array stores the pin numbers where each LED is connected.
• int pinCount = 6;: This variable holds the number of pins (i.e., the number of LEDs).

Setup

• void setup(): The setup() function runs once when the program starts. Inside this function:
  • A for loop is used to iterate through each pin in the ledPins array, setting each as an output using pinMode().

Loop

• void loop(): The loop() function runs continuously after setup(). Inside this function:
  • First Loop:
    • A for loop iterates from the lowest to the highest pin in the ledPins array.
    • digitalWrite(ledPins[thisPin], HIGH);: This turns on the current LED.
    • delay(timer);: This pauses the program for the duration specified by the timer variable.
    • digitalWrite(ledPins[thisPin], LOW);: This turns off the current LED.
  • Second Loop:
    • Another for loop iterates from the highest to the lowest pin in the ledPins array, reversing the LED sequence.
    • The same steps as in the first loop are repeated to light up and turn off the LEDs in reverse order.

How to Use

1. Connect your Arduino board to your computer.
2. Open the Arduino IDE.
3. Copy and paste the provided code into a new sketch.
4. Upload the sketch to your Arduino board.
5. Watch the LEDs light up sequentially from one end to the other and then back again.

Customization

• Adjust the timer variable to speed up or slow down the LED sequence.
• Modify the ledPins array to change the order or number of LEDs in the sequence.

License

This project is open-source and available under the MIT License.

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Enjoy creating dynamic LED sequences with Arduino!