More Arduino and LED examples
In the first basic tutorial we showed a couple of simple LED examples, here is another couple to try
A reminder of the schematic if you need it
Code examples
Start up the Arduino IDE, a barebones sketch will appear, delete everything and enter the following
Example 1: Leds on and off – one at a time
[codesyntax lang=”cpp”]
/*
* Blink many LEDs example
* switches an LED on and off one at a time
*/
void setup()
{
pinMode(2, OUTPUT); // set pin 2 as output
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
pinMode(6, OUTPUT);
pinMode(7, OUTPUT);
pinMode(8, OUTPUT);
}
void loop()
{
digitalWrite(2, HIGH);
delay(1000);
digitalWrite(2, LOW);
delay(1000);
digitalWrite(3, HIGH);
delay(1000);
digitalWrite(3, LOW);
delay(1000);
digitalWrite(4, HIGH);
delay(1000);
digitalWrite(4, LOW);
delay(1000);
digitalWrite(5, HIGH);
delay(1000);
digitalWrite(5, LOW);
delay(1000);
digitalWrite(6, HIGH);
delay(1000);
digitalWrite(6, LOW);
delay(1000);
digitalWrite(7, HIGH);
delay(1000);
digitalWrite(7, LOW);
delay(1000);
digitalWrite(8, HIGH);
delay(1000);
digitalWrite(8, LOW);
delay(1000);
}
[/codesyntax]
Example 2: Switch the LEDs on one a time and then off again
[codesyntax lang=”cpp”]
/*
* Blink many LEDs example
* switches an LED on one at a time then off one at a time
*/
void setup()
{
pinMode(2, OUTPUT); // set pin 2 as output
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
pinMode(6, OUTPUT);
pinMode(7, OUTPUT);
pinMode(8, OUTPUT);
}
void loop()
{
digitalWrite(2, HIGH);
delay(1000);
digitalWrite(3, HIGH);
delay(1000);
digitalWrite(4, HIGH);
delay(1000);
digitalWrite(5, HIGH);
delay(1000);
digitalWrite(6, HIGH);
delay(1000);
digitalWrite(7, HIGH);
delay(1000);
digitalWrite(8, HIGH);
delay(1000);
digitalWrite(2, LOW);
delay(1000);
digitalWrite(3, LOW);
delay(1000);
digitalWrite(4, LOW);
delay(1000);
digitalWrite(5, LOW);
delay(1000);
digitalWrite(6, LOW);
delay(1000);
digitalWrite(7, LOW);
delay(1000);
digitalWrite(8, LOW);
delay(1000);
}
[/codesyntax]
Example 3 : All on the All off
[codesyntax lang=”cpp”]
/*
* Blink many LEDs example
* switches all LEDs on then off
*/
void setup()
{
pinMode(2, OUTPUT); // set pin 2 as output
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
pinMode(6, OUTPUT);
pinMode(7, OUTPUT);
pinMode(8, OUTPUT);
}
void loop()
{
digitalWrite(2, HIGH);
digitalWrite(3, HIGH);
digitalWrite(4, HIGH);
digitalWrite(5, HIGH);
digitalWrite(6, HIGH);
digitalWrite(7, HIGH);
digitalWrite(8, HIGH);
delay(1000);
digitalWrite(2, LOW);
digitalWrite(3, LOW);
digitalWrite(4, LOW);
digitalWrite(5, LOW);
digitalWrite(6, LOW);
digitalWrite(7, LOW);
digitalWrite(8, LOW);
delay(1000);
}
[/codesyntax]
Of course there are better ways of doing the examples above, we will show you these soon
