pulseIn

Syntax

uint32_t pulseIn(
    uint32_t ulPin, 
    uint32_t ulState, 
    uint32_t ulTimeout = 1000000L
);

Duration of acquiring voltage (HIGH or LOW) of a pin. The accuracy is us; range is approx. 10us to 3 mins.

Parameters	Description
uint32_t ulPin	[IN] Pin number measured
uint32_t ulState	[IN] Voltage type measured (HIGH or LOW)
uint32_t ulTimeout = 1000000L	[IN] The longest time allowed by the function before the measurement starts; unit: us (If not set, default will be 1s.)

#define BUTTON   13
unsigned long duration;
void setup()
{
    pinMode(BUTTON, INPUT);
}
void loop()
{
    duration = pulseIn(BUTTON, HIGH);
}

wiring_pulse.h