Arduino Uno Introduction

Light up LED 13 on an Arduino Uno

• Open the Arduino IDE and create a new sketch.

• In the sketch, write the following code:

void setup() {
  pinMode(13, OUTPUT);
}

void loop() {
  digitalWrite(13, HIGH);
  delay(1000);
  digitalWrite(13, LOW);
  delay(1000);
}

• This code sets pin 13 as an output using the `pinMode()` function in the `setup()` function.
• In the `loop()` function, it turns the LED on by setting pin 13 to `HIGH` using the `digitalWrite()` function, waits for a second using the `delay()` function, turns the LED off by setting pin 13 to `LOW`, and waits for another second.

• Verify that your Arduino Uno board is connected to your computer and select the correct board and port under the "Tools" menu.

• Upload the sketch to the Arduino Uno board by clicking on the "Upload" button.

• Once the sketch is uploaded, the LED connected to pin 13 should start blinking on and off every second.

• Video - Program lights up Arduino UNO on-board LED connected to pin 13 for 1 second.

Arduino UNO - Safety

• Wear eye protection.
• Always get a teacher to inspect your circuit before powering up.
• Wear cotton shirts and pants and closed shoes.
• Even low voltages can cause burns because wires can heat up if shorted.

Wire up an LED connected to Pin 13 on the Arduino Uno

• To light up an LED connected to pin 13 on an Arduino Uno board, you can follow these steps:

• Connect the positive (anode) leg of the LED to pin 13 on the Arduino Uno board.
• Add a 300 Ohm resistor in series

• Connect the negative (cathode) leg of the LED to the GND pin on the Arduino Uno board.

• Open the Arduino IDE and create a new sketch.

• In the sketch, write the following code:

void setup() {
  pinMode(13, OUTPUT);
}

void loop() {
  digitalWrite(13, HIGH);
  delay(1000);
  digitalWrite(13, LOW);
  delay(1000);
}

• This code sets pin 13 as an output using the `pinMode()` function in the `setup()` function.
• In the `loop()` function, it turns the LED on by setting pin 13 to `HIGH` using the `digitalWrite()` function, waits for a second using the `delay()` function, turns the LED off by setting pin 13 to `LOW`, and waits for another second.

• Verify that your Arduino Uno board is connected to your computer and select the correct board and port under the "Tools" menu.

• Upload the sketch to the Arduino Uno board by clicking on the "Upload" button.

• Once the sketch is uploaded, the LED connected to pin 13 should start blinking on and off every second.

Arduino UNO - Building a LED Blink Circuit on a Breadboard

• Video - Build an external LED Blink Circuit for the Arduino UNO.