Introduction: Multiple Blinking LED on the Arduino

In this tutorial I will show you how to make multiple LEDs blink with Arduino.  You will need three LEDs, jumper wires, breadboard, and Arduino.

Step 1: Program the Arduino

Now you will need to paste the following code into the Arduino software and upload it to the Arduino.

int led = 13;
int led2 = 12;
int led3 = 11;

// the setup routine runs once when you press reset:
void setup() {               
  // initialize the digital pin as an output.
  pinMode(led, OUTPUT);
  pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT); 

// the loop routine runs over and over again forever:
void loop() {
  digitalWrite(led, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(100);               // wait for a second
  digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW
  {digitalWrite(led2, HIGH);
digitalWrite(led2, LOW);
{digitalWrite(led3, HIGH);
digitalWrite(led3, LOW);
delay(100);}// wait for a second

Step 2: Connecting GND

First connect a jumper wire from GND to the negative rail on the breadboard.

Step 3: Connecting the LEDs.

Then plug in the other jumper wires like this:
First, plug a wire from 13 on the Arduino to the top row on the breadboard.
Next, plug a wire from 12 on the Arduino to the top row on the breadboard.
Then plug a wire from 11 on the Arduino to the top row on the breadboard.
Space these out well. Use the picture to help you.
Now connect a wire going from the negative rail to the right of the other wires on the breadboard.
Lastly, put the longer leg of the Led (+) under the wire that goes to the Arduino. The shorter leg of the LED goes under the port that connects to the negative rail.

Step 4: Video of It Working