Touchless Soap + Water & Sanitizer Dual-Mode Dispenser

/*
 TOUCHLESS DUAL MODE SOAP+ WATER AND SANITIZER DISPENSER
=========================================================
 CREATED BY JASPAL SINGH KUSHWAHA, BHOPAL, INDIA
 ========================================================
 NOTE: DISPENSING TIME DELAY CAN BE ADJUSTED AS PER USER 
 REQUIREMENT,SUCH AS 20 SECOND SOAP  AND WATER DISPENSING 
 CYCLE, OTHER NUMEROUS OPTION CAN BE TRIED AND FIT TO USE
 THIS CODE IS THE BEST CASE AND PUT TO USE, NO PROBLEM 
 FACED TILL DATE.
 ========================================================  
*/

long duration, inches, cm;

const int pingPin = 16; // Trigger Pin of Ultrasonic Sensor
const int echoPin = 17; // Echo Pin of Ultrasonic Sensor

int watervalve  = 32; // SOLENOID VALVE FOR WATER SUPPLY
int soapvalve = 33;   // SOLENOID VALVE FOR LIQUID SOAP
int modes = 25;       // MODE SWITCH FOR SOAP+WATER OR SANITISER DISPENSING

int soaprange = 10;   // DISTANCE TO ACTIVATE SOAP VALVE
int waterrange =25;   // DISTANCE TO ACTIVATE WATER VALVE


void setup()

{
Serial.begin(115200); // STARTING SERIAL TERMINAL

pinMode(pingPin, OUTPUT);
pinMode(echoPin, INPUT);
pinMode(watervalve, OUTPUT);
pinMode(soapvalve, OUTPUT);
pinMode(modes, INPUT);


}

void loop()
{

ping();           // READ DISTANCE OF HAND
Serial.print(cm);
Serial.println("cm1");
int modesanitize =digitalRead(modes);
Serial.println(modesanitize);
Serial.print("=mode");

if(modesanitize ==LOW) //SOAP + WATER MODE
     {
      ping();
      
      Serial.print(cm);
      Serial.println("cm");
      
      if(cm <= waterrange && cm >16 ) // RANGE FOR WATER VALVE OPERATION
        {
        digitalWrite(watervalve, LOW);
        digitalWrite(soapvalve, HIGH);
        Serial.println("Water supply ON");
        delay(1500);
        }
        else
        {
        digitalWrite(watervalve, HIGH);
        Serial.println("Water supply OFF");
        }
              if(cm <= 15 && cm >2)   RANGE FOR SOAP VALVE OPERATION
              {
              digitalWrite(soapvalve, LOW);
              digitalWrite(watervalve, HIGH);
              Serial.println("Soap supply ON");
              delay(1500);
              }
              else
              {
          
              digitalWrite(soapvalve, HIGH);
              Serial.println("Soap supply OFF");
              }
      }

if(modesanitize == HIGH)      // SANITIZER MODE
      {
      ping();
      Serial.print(cm);
      Serial.println("cm");
      digitalWrite(watervalve, HIGH);
      
      if(cm <= waterrange && cm >20)    // RANGE FOR SOAP VALVE OPERATION
                                        //( TANK FILLED WITH SANITIZER) 
     
      {             
              digitalWrite(soapvalve, LOW);
              digitalWrite(watervalve, HIGH);
              Serial.println("Sanitizer supply ON");
              delay(1500);
              digitalWrite(soapvalve, HIGH);
              delay(2000);     
      }
      else
      {  
      digitalWrite(soapvalve, HIGH);
      digitalWrite(watervalve, HIGH);
      Serial.println("Sanitizer supply OFF");
      }
      }  
}


unsigned long ping() 

{
pinMode(pingPin, OUTPUT); // Make the Pingpin to output
digitalWrite(pingPin, LOW); //Send a low pulse
delayMicroseconds(2); // wait for two microseconds
digitalWrite(pingPin, HIGH); // Send a high pulse
delayMicroseconds(5); // wait for 5 micro seconds
digitalWrite(pingPin, LOW); // send a low pulse
pinMode(pingPin,INPUT); // switch the Pingpin to input
duration = pulseIn(echoPin, HIGH); //listen for echo

/*Convert micro seconds to Inches
-------------------------------------*/

inches = microsecondsToInches(duration);
cm = microsecondsToCentimeters(duration);
}


long microsecondsToInches(long microseconds) // converts time to a distance
{
return microseconds / 74 / 2;
}
long microsecondsToCentimeters(long microseconds) // converts time to a distance
{
return microseconds / 29 / 2;
}