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Added LED to InputPullup example

This commit is contained in:
Tom Igoe 2012-03-14 23:11:35 -04:00
parent 81b6ca2d61
commit 1b58e45f74
1 changed files with 15 additions and 4 deletions
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19
build/shared/examples/2.Digital/DigitalIputPullup/DigitalIputPullup.ino
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@ -6,6 +6,7 @@
The circuit:
* Momentary switch attached from pin 2 to ground
* Built-in LED on pin 13
Unlike pinMode(INPUT), there is no pull-down resistor necessary. An internal
20K-ohm resistor is pulled to 5V. This configuration causes the input to
@ -24,7 +25,8 @@ void setup(){
//start serial connection
Serial.begin(9600);
//configure pin2 as an input and enable the internal pull-up resistor
pinMode(2, INPUT_PULLUP);
pinMode(2, INPUT_PULLUP);
pinMode(13, OUTPUT);
}
@ -33,9 +35,18 @@ void loop(){
int sensorVal = digitalRead(2);
//print out the value of the pushbutton
Serial.println(sensorVal);
//brief delay
delay(10);
// Keep in mind the pullup means the pushbutton's
// logic is inverted. It goes HIGH when it's pressed,
// and LOW when it's not. Turn on pin 13 when the
// button's pressed, and off when it's not:
if (sensorVal == HIGH) {
digitalWrite(13, LOW);
}
else {
digitalWrite(13, HIGH);
}
}