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Digital I/O with Arduino

I bought my first Arduino boards in 2007 and never touched them again ever since setting up the famous “blinking LED” code sample. It does recall some memory when I have my hands on the chips and boards and wires and stuff… again.

The Arduino I have is an old NG(Nuova Generazione) rev C, which is later replaced by the most popular “Diecimila”. It comes with a less popular USB Type B port, and tThe user would need to manually click the reset button before uploading the program to the board.

However there’s is still a good thing about it that it does provide a PIN 13 for LED with built-in resister. Hence it requires least effort to setup a minimum “Blinking LED” sample. You don’t even need a breadboard.

Adding digital input is fun. I decided to leave the LED output as is now that it’s working fine with the preset PIN 13, in the good wishes that I would not mess up too much with the breadboard. 


Check out the video as well!


A small piece of code:

int ledPin = 13; 
int switchPin = 2;

void setup()
  pinMode(ledPin, OUTPUT);      // sets the digital pin as output
  pinMode(switchPin, INPUT);

void loop()
  if (digitalRead(switchPin))
    digitalWrite(ledPin, HIGH);   // sets the LED on
    delay(1000);                  // waits for a second
    digitalWrite(ledPin, LOW);    // sets the LED off
    delay(1000);                  // waits for a second


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