Framework (A-Z)

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

pulseIn()
Examples 
int inpin = 8;
int val = 0;

void setup() {
  pinMode(inpin, INPUT); 
  Serial.begin(9600);
}

void loop() {
  val = pulseIn(inpin, HIGH);
  Serial.println(val);
  delay(100);
}
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
Updated on July 07, 2011 11:08:49pm PDT

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