class OneShotTimer {
  public:
    OneShotTimer(uint8_t pin, const char* lbl): 
        m_pin(pin), m_label(lbl) 
    {
      pinMode(m_pin, OUTPUT);
    }

    void start(float a, float b){
      m_x = a;
      m_y = b;
    }
    
    void pour(float ml) {
      digitalWrite(m_pin, HIGH);
      m_startTime = millis();
      m_setTime = calcDelay(m_x, m_y, ml);
      Serial.print("Start: ");
      Serial.print(m_label);
      Serial.print(", amount: ");
      Serial.print(int(ml));
      Serial.print(", duration: ");
      Serial.print(m_setTime);
      Serial.println(" ms.");
      m_running = 1;
    }

    void run() {
      if (millis() - m_startTime >= m_setTime && m_running) {
        digitalWrite(m_pin, LOW);
        Serial.print("Stop: ");
        Serial.println(m_label);
        m_running = 0;
      }
    }

    uint32_t calcDelay(float a, float b, int ml) {
      double val = a * (ml^2) + b * ml;
      return (uint32_t) val;
    }

  private:
    const char* m_label;
    uint8_t m_pin;
    uint8_t m_running;
    uint32_t m_startTime;
    uint32_t m_setTime;
    uint8_t m_x;
    uint8_t m_y;
};

#define pompa_a 7
#define pompa_b 8
#define pompa_c 9
#define pompa_d 10

OneShotTimer pumpA(pompa_a, "PUMP A");
OneShotTimer pumpB(pompa_b, "PUMP B");
OneShotTimer pumpC(pompa_c, "PUMP C");
OneShotTimer pumpD(pompa_d, "PUMP D");



void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);

  pumpA.start(-0.0568, 66.154);
  pumpB.start(-0.0268, 53.651);
  pumpC.start(-0.0223, 49.775);
  pumpD.start(-0.0505, 64.876);
  pumpA.pour(80);
}

void loop() {
  pumpA.run();
  pumpB.run();
  pumpC.run();
  pumpD.run();
}