| Index

| Reference for Wiring 1.0 (ALPHA) 0021+. If you have a previous version, use the reference included with your software. If you see any errors or have any comments, let us know.

Name |  | ### pulseIn()
Examples |  |
    int inpin = 0;
    int val = 0;

    void setup() {
      pinMode(inpin, INPUT);
    }

    void loop() {
      val = pulseIn(inpin, HIGH);
    }
Description |  | The pulseIn() method returns the length in microseconds on a digital input pin for a short period of time from 10 milliseconds to 3 minutes. It can be used to read sensors that return a pulse train like some accelerometers or rangers. The user can specify the counting on HIGH or LOW transitions. The pulseIn command stops all activity while executing. A timeout of 1 second (1000000 microseconds) prevents the command to wait forever. A specific timeout in microseconds can also be specified.
Syntax |  |
    pulseIn(pin,transition)
    pulseIn(pin,transition,timeout)
Parameters |  |
pin |  | int: the pin used for reading the pulse
transition |  | HIGH or LOW
timeout |  | int: a timeout value in microseconds
Returns |  | int
Usage |  | Application