> For the complete documentation index, see [llms.txt](https://htooaunklinn-organization.gitbook.io/htooaunklinn-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://htooaunklinn-organization.gitbook.io/htooaunklinn-docs/hardware-and-iot/arduino-on-macos/level-1.md).

# Level 1

## Heading 1

<figure><img src="/files/pkpuZJ3nbOfKfNsXenj3" alt="" width="375"><figcaption></figcaption></figure>

```cpp
void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
  digitalWrite(LED_BUILTIN, HIGH);
  delay(1000);
  digitalWrite(LED_BUILTIN, LOW);
  delay(1000);
}
```

## Heading 2

<figure><img src="/files/0rpnhwzOZmWYVZosd56y" alt="" width="375"><figcaption></figcaption></figure>

```cpp
int led_one = 2;
int led_two = 3;
int led_three = 4;

void setup() {
  pinMode(led_one, OUTPUT);
  pinMode(led_two, OUTPUT);
  pinMode(led_two, OUTPUT);
}

void loop() {
  digitalWrite(led_one, HIGH);
  delay(7000);
  digitalWrite(led_one, LOW);
  digitalWrite(led_two, HIGH);
  delay(3000);
  digitalWrite(led_two, LOW);
  digitalWrite(led_three, HIGH);
  delay(10000);
  digitalWrite(led_three, LOW);
}
```

## Heading 3

<figure><img src="/files/3ac8c5Ak2Fao1diujx8Y" alt="" width="375"><figcaption></figcaption></figure>

```cpp
int redPin= 3;
int greenPin = 5;
int  bluePin = 6;

void setup() {
  pinMode(redPin,  OUTPUT);              
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
}

void  loop() {
  setColor(255, 0, 0); // Red Color
  delay(1000);
  setColor(0,  255, 0); // Green Color
  delay(1000);
  setColor(0, 0, 255); // Blue Color
  delay(1000);
  setColor(255, 255, 255); // White Color
  delay(1000);
  setColor(170, 0, 255); // Purple Color
  delay(1000);
  setColor(127, 127,  127); // Light Blue
  delay(1000);
}

void setColor(int redValue, int greenValue,  int blueValue) {
  analogWrite(redPin, redValue);
  analogWrite(greenPin,  greenValue);
  analogWrite(bluePin, blueValue);
}
```