int trigpin =8; int echopin =7; int lightpin= 3; int duration,distance; void setup() { Serial.begin(9600); pinMode(trigpin,OUTPUT); k pinMode(echopin,INPUT); pinMode(lightpin,OUTPUT); } void loop() { digitalWrite(trigpin,HIGH); delay(1000); digitalWrite(trigpin,LOW); duration=pulseIn(echopin,HIGH); distance=duration/58; Serial.println(distance); Serial.println("CM"); if(distance>=180 || distance<=0) { digitalWrite(lightpin,LOW); Serial.println("Bthroom Empty"); } else { digitalWrite(lightpin,HIGH); Serial.println("bathroom busy"); delay (30000); } }