# Lab1 LED

## Members:
411085031 劉又瑄
410985004 陳文彥
411085020 林漢昕

## Principle:
Use high and low signal to control a LED.

## Program:

byte n = 8;
byte LED[][]{{22, 24, 26, 28, 30, 32, 34, 36},
             {23, 25, 27, 29, 31, 33, 35, 37}}

void setup() {
  for (int i = 0; i < n; i++) {
    pinMode(LED[i], OUTPUT);
    digitalWrite(LED[i], 0);
    pinMode(LED1[i], OUTPUT);
    digitalWrite(LED1[i], 1);   
  }
}

void toDigit(int num, int indexOfLight) {
  int index = 0;
  while (num) {
    digitalWrite(LED[indexOfLight][index++], (num + indexOfLight) & 1);
    num /= 2;
  }
}

void loop() {
  for (int i = 0; i < 10000; i++) {
    toDigit(i % 100, 0);
    toDigit(i / 100, 1);
    delay(5);
    for (int i = 0; i < n; i++) {
      digitalWrite(LED[0][i], 0);
      digitalWrite(LED[1][i], 1);
    }
  }
}

## Description

### ``setup()``
Set up the output pin.

### ``toDigit(int num, int indexOfLight)``
Transform num to LED digit, use indexOfLight to select LED we want to control.

### ``loop()``
From 0 to 1, use``toDigit()``to light the LED.

## Result

### [影片連結](https://drive.google.com/drive/folders/1lTCeihTz7mRnRrKLgFJRyaz3LuA85ZoF)