Car Parking Monitoring System Using Arduino and Visual Basic

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p1slot1(); 
p1slot2();
p1slot3(); 
 
p2slot1();
p2slot2();
p2slot3();
 
  
  
   cdata = cdata + sensor1 +"," + sensor2 + ","+ sensor3 +","+ sensor4 + "," + sensor5 + "," + sensor6 +","; // comma will be used a delimeter
   Serial.println(cdata); 
   nodemcu.println(cdata);
   delay(2000); // 2 seconds
   cdata = ""; 
digitalWrite(parking1_slot1_ir_s, HIGH); 
digitalWrite(parking1_slot2_ir_s, HIGH); 
digitalWrite(parking1_slot3_ir_s, HIGH);
 
digitalWrite(parking2_slot1_ir_s, HIGH);
digitalWrite(parking2_slot2_ir_s, HIGH);
digitalWrite(parking2_slot3_ir_s, HIGH);
}
 
P1slot1 is a user defined function, it has no return type and it doesn not take any argument as the input.  if there is a car infront of the sensor it gives digital logic 0, and if no car then it give digital logic 1, depending on this, then we store p1s1on or p1s1off.  The same mechanism is used for all the other infrared sensors.
 
void p1slot1() // parkng 1 slot1
{
  if( digitalRead(parking1_slot1_ir_s) == LOW) 
  {
  sensor1 = "p1s1on"; // parking1 slot1 
 delay(200); 
  } 
if( digitalRead(parking1_slot1_ir_s) == HIGH)
{
  sensor1 = "p1s1off";  
 delay(200);  
}
 
}
 
void p1slot2() // parking 1 slot2
{
  if( digitalRead(parking1_slot2_ir_s) == LOW) 
  {
  sensor2 = "p1s2on"; 
  delay(200); 
  }
if( digitalRead(parking1_slot2_ir_s) == HIGH)  
  {
  sensor2 = "p1s2off";  
 delay(200);
  } 
}
 
 
void p1slot3() // parking 1 slot3
{
  if( digitalRead(parking1_slot3_ir_s) == LOW) 
  {
  sensor3 = "p1s3on"; 
  delay(200); 
  }
if( digitalRead(parking1_slot3_ir_s) == HIGH)  
  {
  sensor3 = "p1s3off";  
 delay(200);
  } 
}
 
 
// now for parking 2
 
void p2slot1() // parking 1 slot3
{
  if( digitalRead(parking2_slot1_ir_s) == LOW) 
  {
  sensor4 = "p2s1on"; 
  delay(200); 
  }
if( digitalRead(parking2_slot1_ir_s) == HIGH)  
  {
  sensor4 = "p2s1off";  
 delay(200);
  } 
}
 
 
void p2slot2() // parking 1 slot3
{
  if( digitalRead(parking2_slot2_ir_s) == LOW) 
  {
  sensor5 = "p2s2on"; 
  delay(200); 
  }
if( digitalRead(parking2_slot2_ir_s) == HIGH)  
  {
  sensor5 = "p2s2off";  
 delay(200);
  } 
}
 
 
void p2slot3() // parking 1 slot3
{
  if( digitalRead(parking2_slot3_ir_s) == LOW) 
  {
  sensor6 = "p2s3on"; 
  delay(200); 
  }
if( digitalRead(parking2_slot3_ir_s) == HIGH)  
  {
  sensor6 = "p2s3off";  
 delay(200);
  } 
}