ATOM-DRIP Automated Mobile Dispenser

/////////////////////////////////
//Aurthor::isaac umoh///////////
//Date::15:May:2020////////////
/////////////////////////////////
#define SOAP        9
#define WATER       8
#define BUZZER      11
#define trig        2
#define echo        3

//VARIABLES TO STORE DISTANCE
float distance;

//will store last updated time
unsigned long previousMillis = 0;    


bool soap_flag = true;
bool water_flag = false;
bool flag = true;
void setup() {
  Serial.begin(9600);
  Serial.println("COVID19 Solution");
  pinMode(SOAP, OUTPUT);
  pinMode(WATER, OUTPUT);
  pinMode(BUZZER, OUTPUT);
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
}

void loop() {
  distance = getDistance();
  Serial.println("Distance: " + String(distance));
  delay(100);
  
  if(distance <= 10 && soap_flag == true && water_flag == false && flag == true) {
      uint32_t start_time = millis();
      while((millis()- start_time) < 2000)  { //sample for 2 Sec
        digitalWrite(SOAP, HIGH);
      }
      flag = false;
      digitalWrite(SOAP, LOW);
  }

   if(distance >= 12 && flag == false) {
      soap_flag = false;
      water_flag = true;
   }

  if(distance <= 10 && soap_flag == false && water_flag == true && flag == false) {
      float dist;
      while(dist <= 10) {
        dist = getDistance();
        digitalWrite(WATER, HIGH);
      } 
        flag = true;
        digitalWrite(WATER, LOW);
  }

  if(distance >= 12 && flag == true) {
      soap_flag = true;
      water_flag = false;
   }
}


float getDistance() {
  long duration;
  float distance;
  digitalWrite(trig, LOW); 
  delayMicroseconds(2); 
  digitalWrite(trig, HIGH);
  delayMicroseconds(10); 
  digitalWrite(trig, LOW);
  duration = pulseIn(echo, HIGH);
  distance = duration / 58.2;
  delay(50);
  return distance;
}






//  if(distance <= 10 && soap_flag == true && water_flag == false && flag == true) {
//      digitalWrite(SOAP, HIGH);
//      delay(1000);
//      flag = false;
//      digitalWrite(SOAP, LOW);
//  }
//
//   if(distance >= 12 && flag == false) {
//      soap_flag = false;
//      water_flag = true;
//   }
//
//  if(distance <= 10 && soap_flag == false && water_flag == true && flag == false) {
//      digitalWrite(WATER, HIGH);
//      delay(1000);
//      flag = true;
//      digitalWrite(WATER, LOW);
//  }
//
//  if(distance >= 12 && flag == true) {
//      soap_flag = true;
//      water_flag = false;
//   }