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hacklab-ArduinoComic-Page-12.html
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hacklab-ArduinoComic-Page-12.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html lang="en" xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">
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<meta content="text/html; charset=utf-8" http-equiv="Content-type"/>
<meta content="en-us" http-equiv="Content-Language"/>
<title>
/hacklab-ArduinoComic-Page-12
</title>
</head>
<body>
PAGE 12: Digital input: setting up a switch to turn LED on and off
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Panel 45:
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Drawing: hand holding switch
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(In text panel): Next we will add a switch, a digital input, so we can turn the LED off and on.
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Panel 46:
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Drawing: Detail of switch attached to board along with LED and resistors
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(In text panel): Connect one end of a momentary switch to pin 4 on the
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Arduino, with a 10k resistor connected to ground attached to the same end. Attach the other end to power. We will leave the LED attached to the same pin.
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Panel 47:
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Drawing: code for switch script written on white shape
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void setup() {
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pinMode(2, OUTPUT);
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pinMode(4, INPUT);
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}
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void loop() {
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if(digitalRead(4)){
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digitalWrite(2, HIGH);
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}else{
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digitalWrite(2, LOW);
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}
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}
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(In text panels): Next we’ll write the code. In setup, we declare pin 2 an output and pin 4 an input. In loop, we use an if statement, if we read pin 4 as high, we set the LED pin to high, otherwise we set the LED pin to low, turning it off.
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Panel 48:
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Drawing: split panel, finger pushing switch with LED lit, finger lets up and LED is off
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(In text panel) The LED lights when the switch is held down.
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