Dosieranlage mit Arduino - kurze Frage

#include <LiquidCrystal.h>

LiquidCrystal lcd(8, 9, 4, 5, 6, 7);

int lcd_key     = 0;

int adc_key_in  = 0;

float current_volume = 0;                //Current total volume passed though flow meter

float target_volume = 0.5;                //Total desired volume

float adjustment_volume = 0;             //Adjustment volume to take into account delays in solenoid closing. Subtracted from the current volume.

#define btnRIGHT  0

#define btnUP     1

#define btnDOWN   2

#define btnLEFT   3

#define btnSELECT 4

#define btnNONE   5

#define hltSIZE   0.6                       //Size of the Hot Liquor Tun in litres

#define SOLENOIDPIN 13                      //Solenoid relay on Pin 13

#define FLOWSENSORPIN 12                    //Flow sensore on Pin 2

// count how many pulses

volatile uint16_t pulses = 0;

// track the state of the pulse pin

volatile uint8_t lastflowpinstate;

// you can try to keep time of how long it is between pulses

volatile uint32_t lastflowratetimer = 0;

// and use that to calculate a flow rate

volatile float flowrate;

// Interrupt is called once a millisecond, looks for any pulses from the sensor!

SIGNAL(TIMER0_COMPA_vect) {

  uint8_t x = digitalRead(FLOWSENSORPIN);

  if (x == lastflowpinstate) {

    lastflowratetimer++;

    return; // nothing changed!

  }

  if (x == HIGH) {

    //low to high transition!

    pulses++;

  }

  lastflowpinstate = x;

  flowrate = 1000.0;

  flowrate /= lastflowratetimer; // in hertz

  lastflowratetimer = 0;

}

void useInterrupt(boolean v) {

  if (v) {

    // Timer0 is already used for millis() - we'll just interrupt somewhere

    // in the middle and call the "Compare A" function above

    OCR0A = 0xAF;

    TIMSK0 |= _BV(OCIE0A);

  } else {

    // do not call the interrupt function COMPA anymore

    TIMSK0 &= ~_BV(OCIE0A);

  }

}

void setup()

{

  Serial.begin(9600);

  Serial.print("Flow sensor test!");

  digitalWrite(SOLENOIDPIN,LOW);           //ACTIVE HIGH RELAY PUT THIS FIRST TO ENSURE PIN IS IN CORRECT STATE BEFORE WE INIT IT

  digitalWrite(FLOWSENSORPIN, HIGH);

  pinMode(SOLENOIDPIN, OUTPUT);

  pinMode(FLOWSENSORPIN, INPUT);

  lcd.begin(16, 2);                        // start the library

  printBanner(3000);                       // show banner for 2 seconds

  lcd.clear();

  printLabels();

  lastflowpinstate = digitalRead(FLOWSENSORPIN);

  useInterrupt(true);

}

void loop()

{

  while(current_volume < (target_volume - adjustment_volume))

  { 

    dowork();

  }

  digitalWrite(SOLENOIDPIN,HIGH);          //Close solenoid //normal low!!

  lcd.setCursor(0,0);

  lcd.print("Waschm. dosieren");

  lcd.setCursor(0,1);

  lcd.print(" Start druecken ");

  //Debug Messaging

  Serial.println("  VALVE CLOSED  ");

  Serial.println("   TARGET HIT   ");

}

void printBanner(int bannerdelay)

{

  lcd.setCursor(0,0);                     

  lcd.print("  Waschmittel   ");

  lcd.setCursor(0,1);  

  lcd.print("  wird dosiert  ");

  delay(bannerdelay);

}

void printLabels()

{

  lcd.setCursor(0,0);

  lcd.print("Ziel: ");

  lcd.setCursor(0,1);

  lcd.print("Aktuell: ");

}

// read the buttons

int read_LCD_buttons()

{

  adc_key_in = analogRead(0);

  /*  OLD BUTTONS at 3.3V

  if (adc_key_in > 1000) return btnNONE;

  if (adc_key_in < 50)   return btnRIGHT; 

  if (adc_key_in < 195)  return btnSELECT;

  if (adc_key_in < 380)  return btnUP;

  if (adc_key_in < 555)  return btnDOWN;

  if (adc_key_in < 790)  return btnLEFT; 

 */

 if (adc_key_in > 1000) return btnNONE;  

 if (adc_key_in < 50)   return btnRIGHT; 

 if (adc_key_in < 195)  return btnUP;

 if (adc_key_in < 380)  return btnDOWN;

 if (adc_key_in < 555)  return btnLEFT;

 if (adc_key_in < 790)  return btnSELECT; 

  return btnNONE;

}

void dowork()

{

  //Serial.print("Freq: "); Serial.println(flowrate);        //Uncomment these two lines to monitor the freq/pulses

  //Serial.print("Pulses: "); Serial.println(pulses, DEC);

  float liters = pulses;

  liters /= 7.5;

  liters /= 60.0;

  current_volume = liters;

  //Debug Messaging

  Serial.print("Cur: "); Serial.println(current_volume);

  Serial.print("Tar: "); Serial.println(target_volume);

  //Print the target volume value in litres

  lcd.setCursor(11,0);

  lcd.print(target_volume,2);

  lcd.setCursor(15,0);

  lcd.print("L");

  //Print the current volume value in litres

  lcd.setCursor(11,1);            

  lcd.print(current_volume,2);

  lcd.setCursor(15,1);

  lcd.print("L");

  lcd_key = read_LCD_buttons();    // read the buttons

  switch (lcd_key)               // depending on which button was pushed, we perform an action

  {

  case btnRIGHT:

    {

     if (digitalRead(SOLENOIDPIN == HIGH))

     {

             digitalWrite(SOLENOIDPIN,LOW);       //STOP FLOW

     }

      Serial.println("Solenoid Closed");

      break;

    }

  case btnLEFT:

    {

     if (digitalRead(SOLENOIDPIN == LOW))

     {

             digitalWrite(SOLENOIDPIN,HIGH);       //START FLOW

     }

      Serial.println("Solenoid Open");

      break;

    }

  case btnUP:

    {

      if (target_volume >= hltSIZE)  //don't go larger than the size of the vessel

      {

        target_volume = hltSIZE;

        break;

      }

      else

      {

        target_volume += 0.01;

        break;

      }

      break;

    }

  case btnDOWN:

    {

      if (target_volume <= 0)      //don't go below zero

      {

        target_volume = 0;

        break; 

      }

      else

      {

        target_volume -= 0.01;

      }

      break;

    }

  case btnNONE:

    {

      break;

    }

  }

}