Arduino＃4　ボタンを押してLEDを光らせてみた‼

配線図

この回路図の作図には fritzing を利用させて頂いております。https://fritzing.org/home/

使用部品

• LED
• 抵抗　330Ω
• プッシュボタン
• 抵抗　10ｋΩ

Arduino IDE

「ファイル」＞「スケッチ例」＞「02.Digital」＞「Button」を選択。

1. /*
2.   Button
4.   Turns on and off a light emitting diode(LED) connected to digital pin 13,
5.   when pressing a pushbutton attached to pin 2.
7.   The circuit:
8.   – LED attached from pin 13 to ground through 220 ohm resistor
9.   – pushbutton attached to pin 2 from +5V
10.   – 10K resistor attached to pin 2 from ground
12.   – Note: on most Arduinos there is already an LED on the board
13.     attached to pin 13.
15.   created 2005
16.   by DojoDave <http://www.0j0.org>
17.   modified 30 Aug 2011
18.   by Tom Igoe
20.   This example code is in the public domain.
22. https://www.arduino.cc/en/Tutorial/BuiltInExamples/Button
23. */
25. // constants won’t change. They’re used here to set pin numbers:
26. const int buttonPin = 2;  // the number of the pushbutton pin
27. const int ledPin = 13;    // the number of the LED pin
29. // variables will change:
30. int buttonState = 0;  // variable for reading the pushbutton status
32. void setup() {
33.   // initialize the LED pin as an output:
34.   pinMode(ledPin, OUTPUT);
35.   // initialize the pushbutton pin as an input:
36.   pinMode(buttonPin, INPUT);
37. }
39. void loop() {
40.   // read the state of the pushbutton value:
41.   buttonState = digitalRead(buttonPin);
43.   // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
44.   if (buttonState == HIGH) {
45.     // turn LED on:
46.     digitalWrite(ledPin, HIGH);
47.   } else {
48.     // turn LED off:
49.     digitalWrite(ledPin, LOW);
50.   }
51. }

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