Touchless doorbell for Covid-19

1//www.youtube.com/Electronics is Fun//
2//www.facebook.com/Electronics  is Fun//
3
4
5int analogInPin = A5;  // Analog input pin that the potentiometer  is attached to
6
7int out =13;
8int sensorValue = 0;        // value read  from the pot
9
10
11void setup() {
12  // initialize serial communications  at 9600 bps:
13  Serial.begin(9600);
14  pinMode(out, OUTPUT);
15}
16
17void  loop() {
18  // read the analog in value:
19  sensorValue = analogRead(analogInPin);
20
21
22  Serial.print("sensor = " );
23  Serial.println(sensorValue);
24
25  delay(200);
26  
27  if(sensorValue<500)
28  {
29    digitalWrite(out,1);
30  }
31  else
32  {
33    digitalWrite(out,0);
34  }
35  
36}