digitalRead()

[Digital I/O]

説明

Reads the value from a specified digital pin, either HIGH または LOW.

Syntax

digitalRead(pin)

Parameters

pin: the number of the digital pin you want to read (int)

Returns

HIGH または LOW

Example Code

Sets pin 13 to the same value as pin 7, declared as an input.

int ledPin = 13;  // LED connected to digital pin 13
int inPin = 7;    // pushbutton connected to digital pin 7
int val = 0;      // variable to store the read value

void setup() {
  pinMode(ledPin, OUTPUT);  // sets the digital pin 13 as output
  pinMode(inPin, INPUT);    // sets the digital pin 7 as input
}

void loop() {
  val = digitalRead(inPin);   // read the input pin
  digitalWrite(ledPin, val);  // sets the LED to the button's value
}

Notes

If the pin isn’t connected to anything, digitalRead() can return either HIGH または LOW (and this can change randomly).

Unlike Arduino, the analog input pins (referred to as A0, A1, etc) of 86Duino cannot be used as digital pins.

See also

• [Language] pinMode()
• [Language] digitalWrite()

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86Duino のリファレンスのテキストは Arduino レファレンス を編集したもので、 Creative Commons Attribution-ShareAlike 3.0 License下でライセンスされています。リファレンス内のコードサンプルはパブリックドメインとして公開されています。