VW Button Press, Cycle LED - A1(switch), D12(led)

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Thanks, I think that's a great starting point and will certainly help me in future.

I've actually found this code to work - when I hold the button down it ensures the led flashes.

So I'm as good as done, I'll just butched the code to make it do what I want.

#include <stdio.h>
#include <stdlib.h>

const int button = 15;            // GPIO 15 for the button
const int led =12;                // GPIO 12 for the LED
int ledflag=0;                   // LED status flag

void setup() {
  pinMode(button,INPUT);         // define button as an input 
  pinMode(led,OUTPUT);           // define LED as an output
  digitalWrite(led,HIGH);         // turn output off just in case
}

void loop() {
  if (digitalRead(button)==LOW){ // if button is pressed
    if (ledflag==0) {             // and the status flag is LOW
      ledflag=1;                  // make status flag HIGH
      digitalWrite(led,LOW);     // and turn on the LED
      }                           // 
    else {                        // otherwise...
      ledflag=0;                  // make status flag LOW
      digitalWrite(led,HIGH);      // and turn off the LED
    }
  delay(1000);                    // wait a sec for the 
  }                               // hardware to stabilize
}                                 // begin again