Eine LED leuchtet nur, wenn ein Knopf gedrückt ist.
/*
* Button
*
* Turns on a light emitting diode(LED) connected to digital
* pin 13, when pressing a pushbutton attached to pin 2.
*
*/
int ledPin = 13; // choose the pin for the LED
int inputPin = 2; // choose the input pin (for a pushbutton)
int val = 0; // variable for reading the pin status
void setup() {
pinMode(ledPin, OUTPUT); // declare LED-pin as output
pinMode(inputPin, INPUT); // declare pushbutton-pin as input
}
void loop(){
val = digitalRead(inputPin); // read input value
if (val == HIGH) { // check if the input is HIGH
digitalWrite(ledPin, HIGH); // turn LED ON
}
else {
digitalWrite(ledPin, LOW); // turn LED OFF
}
}
