Search wiring.org.co:

Reference for Wiring version 1.0 Build 0100+ If you have a previous version, use the reference included with your software. If see any errors or have any comments, let us know.

Name |

### pullup()

Examples |
    int inpin = 8;
    int val = 0;

    void setup() {
      pinMode(WLED, OUTPUT);
      pinMode(inpin, INPUT);
      // sets the internal pullup on the pin
      pullup(inpin);
    }

    void loop() {
      // since the pin has the internal
      // pullup resistor enabled
      // reading the pin with nothing attach to it will
      // return HIGH
      val = digitalRead(inpin);
      if (val == HIGH)
      {
        digitalWrite(WLED, HIGH);
      } else {
        digitalWrite(WLED, LOW);
      }
    }
Description | Pullup resistors are used in circuits to ensure that an input pin settle at an expected logical value (HIGH) when the pin is disconnected or high-impedance. The pullup() method sets the AVR core processors internal pullup resistor on a pin. By default the internal pullup is disabled.
Syntax |
    pullup(pin)
Parameters |

pin | pin number

Returns | None
Usage | Application
Related | noPullup() INPUT OUTPUT pinMode() digitalWrite()
digitalRead()

Updated on July 07, 2011 11:08:48pm PDT