digitalRead() 함수

http://www.arduino.cc/en/Reference/DigitalRead

digitalRead()

Description

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

주어진 핀으로 부터, HIGH또는 LOW값을 읽는다.

Syntax

digitalRead(pin)

Parameters

pin: the number of the digital pin you want to read (int), 읽기를 원하는 핀번호

Returns

HIGH or LOW

Example

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
}

[Get Code]

Note

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

만일 핀에 아무것도 연결하지 않았다면, digitalRead()함수는 HIGH또는 LOW중하나를 리턴할 수있다(그리고 이것은 랜덤하게 바뀐다).

The analog input pins can be used as digital pins, referred to as A0, A1, etc.

아날로그 입력핀은 디지털핀으로 사용될 수 있으며, A0, A1, 등과 같이 참조된다.

See also

• pinMode()
• digitalWrite()
• Tutorial: Digital Pins

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