int trigger_pin = 2;
int echo_pin = 3;
int led_pin = 10;
int time;
int distance;
void setup ( ) {
Serial.begin (9600);
pinMode (trigger_pin, OUTPUT);
pinMode (echo_pin, INPUT);
pinMode (led_pin, OUTPUT);
}
void loop ( ) {
digitalWrite (trigger_pin, HIGH);
delayMicroseconds (10);
digitalWrite (trigger_pin, LOW);
time = pulseIn (echo_pin, HIGH);
distance = (time * 0.034) / 2;
if (distance <= 20)
{
Serial.println (" Door Open ");
Serial.print (" Distance= ");
Serial.println (distance);
digitalWrite (led_pin, HIGH);
delay (500);
}
else {
Serial.println (" Door closed ");
Serial.print (" Distance= ");
Serial.println (distance);
digitalWrite (led_pin, LOW);
delay (500);
}
}
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