Keyestudio ARDUINO maker learning kit Manual page 161

Sample program
int pin = 7; //attach to the third pin of NE555
unsigned long duration; //the variable to store the length of the pulse
void setup()
{ pinMode(pin, INPUT); //set the pin as an input
Serial.begin(9600); // start serial port at 9600 bps:
}
void loop()
{
duration = pulseIn(pin, HIGH); //Reads a pulse on pin
Serial.print(duration); //print the length of the pulse on the serial monitor
Serial.println(); //print an blank on serial monitor
delay(500); //wait for 500 microseconds
}
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