/**
   Arduino Electronic Safe

   Copyright (C) 2020, Uri Shaked.
   Released under the MIT License.
*/

#include <LiquidCrystal.h>

/* Locking mechanism definitions */
#define   BUTTONS          A7 
#define A5_Val A5
#define A4_Val A4
#define A3_Val A3
#define   PUMP_D5          5
#define   PUMP_D6          6
#define   PUMP_D9          9
#define   PUMP_D10         10
#define   PUMP_D11         11

int iVoltageA5 = 0;
int iVoltageA4 = 0;
int iVoltageA3 = 0;

//////////////////////
/// BUTTONS & MENU ///
//////////////////////
  
// B1, B2, B3, B4//
// byte bSet = 0;
// byte bUp = 511;
// byte bDown = 683;
// byte bEnter = 773;

const byte bMainMenu = 7;
const byte bSetMenu  = 11;

byte bSec = 1; //set the timer to count in seconds rather than 0.5 sec
byte bWait = 0;
byte bPauseMenu = 0;
byte bPauseEnter = 0;
int A7_VAL = 0; // BUTTON INPUT
int bMenuTimerMax = 1000; //250ms       
int bMenuTimer = bMenuTimerMax;
int iMenuSelectMin = 1000;
int iMenuSelectMax = 8000;
int iMenuSelect = iMenuSelectMin;
int iMenuSelectStep = iMenuSelectMin;
 
/////////////////////////////////
// Nutrient Controller Setting //
///////////////////////////////// 

int iWtrQty = 10;
int iNutrient_to_Water = 4;

///////////////
// pH Sensor //
/////////////// 

const int cCalibrateMenuMin = 1100; 
const int cCalibrateMenuMax = 1600; 

byte bMeasure4_0 = 0;
byte bMeasure6_8 = 0;
byte bMeasure8_0 = 0;
int ipHCalibrateCntMax = 100; //250ms 1000/4000
int ipHCalibrateCnt = ipHCalibrateCntMax;

long lpH_Calibration = 0;
double dpH_4_0 = 0;     
double dpH_6_8 = 0;     
double dpH_8_0 = 0;     
double dCoeffA = 0;
double dCoeffB = 0;
double dCurrentpH = 0;
double dpHLower = 5.0;
double dpHUpper = 8.0;
int ipH_CalibrationRaw = 0;     
int ipH_Points = 1000;     
int ipH_PointsCnt = 0;     

byte bCalibrateState = 0;
byte bpHDisplayUpdate = 1;

int iPrevMenuSelect = 0;

//DOSING
int ipHReadCntMax = 100; //250ms 1000/4000
int ipHReadCnt = ipHReadCntMax;

int ipH_TestPointsCnt = 0;
int ipHTestCnt = 3;
byte bMeasurepHState = 1;
int ipH_Raw = 0;
long lpH_Sum = 0;
double dpH_Test = 0;
int iBasePumpTimerCnt = 0;
int iBasePumpTimer = 3;
int iAcidPumpTimerCnt = 0;
int iAcidPumpTimer = 3;
byte bBasePumpPower = 200;
byte bAcidPumpPower = 200;
byte bBasePumpState = 3;
byte bAcidPumpState = 3;
int iPumpWaitTimerMax = 60; //Wait 60 minutes before enabling the base pump
int iBasePumpWaitTimer = iPumpWaitTimerMax * 60; 
int iAcidPumpWaitTimer = iPumpWaitTimerMax * 60; 
int iPrevMenu = 0;
byte bPumpMenuCnt = 200; 

/* Display */
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
byte bBackLightTimer = 10; //seconds
byte bBackLight = bBackLightTimer;

void setup() {
  //LCD

  lcd.begin(16, 2);
  lcd.setCursor ( 0, 0 );        // go to the next line
  lcd.print("* Hydroponics *");  
  lcd.setCursor ( 0, 1 );        // go to the next line
  lcd.print("* Menu System *");  

  cli();//stop interrupts
  //set timer0 interrupt at 2kHz
  
  //set timer1 interrupt at 1Hz
    TCCR1A = 0;// set entire TCCR1A register to 0
    TCCR1B = 0;// same for TCCR1B
    TCNT1  = 0;//initialize counter value to 0
    // set compare match register for 1hz increments
    OCR1A = 15624;// = (16*10^6) / (1*1024) - 1 (must be <65536)
    // turn on CTC mode
    TCCR1B |= (1 << WGM12);
    // Set CS12 and CS10 bits for 1024 prescaler
    TCCR1B |= (1 << CS12) | (1 << CS10);  
    // enable timer compare interrupt
    TIMSK1 |= (1 << OCIE1A);
  
  //set timer2 interrupt at 8kHz
    TCCR2A = 0;// set entire TCCR2A register to 0
    TCCR2B = 0;// same for TCCR2B
    TCNT2  = 0;//initialize counter value to 0
    // set compare match register for 8khz increments
    OCR2A = 249;// = (16*10^6) / (8000*8) - 1 (must be <256)
    // turn on CTC mode
    TCCR2A |= (1 << WGM21);
    // Set CS21 bit for 8 prescaler
    TCCR2B |= (1 << CS21);   
    // enable timer compare interrupt
    TIMSK2 |= (1 << OCIE2A);
  sei();//allow interrupts 
 
}

void loop() {
 

  
  
 if (bMenuTimer==0) {
   pMenu();   
 }
 

}


void pMenu(){
  bMenuTimer = bMenuTimerMax;
  //A7_VAL = analogRead(BUTTONS);

  iVoltageA5 = analogRead(A5_Val);
  iVoltageA4 = analogRead(A4_Val);
  iVoltageA3 = analogRead(A3_Val);
  A7_VAL = 1024;
  if (iVoltageA5 == 0) {
    A7_VAL = 683;
  }
  if (iVoltageA4 == 0) {
    A7_VAL = 511;
  }
  if (iVoltageA3 == 0) {
    A7_VAL = 10;
  }

  //Serial.println(A7_VAL);
// byte bUp = 511;
// byte bDown = 683;
// byte bEnter = 773;

  //MENU NAVIGATION
  if ((A7_VAL > 500) && (A7_VAL < 550) && (iMenuSelect < iMenuSelectMax) && (bPauseMenu == 0)) {  //DOWN
    iMenuSelect = iMenuSelect + iMenuSelectStep;  
    //Serial.println("Menu Select:"+String(iMenuSelect)+", MenuStep:"+String(iMenuSelectStep) );
  }
  else if ((A7_VAL > 630) && (A7_VAL < 730) && (iMenuSelect > iMenuSelectMin) && bPauseMenu == 0) {  //UP
    iMenuSelect = iMenuSelect - iMenuSelectStep;  
    //Serial.println("Menu Select:"+String(iMenuSelect)+", MenuStep:"+String(iMenuSelectStep) );
  }
  else if ((A7_VAL >= 0) && (A7_VAL < 50) && (bPauseEnter == 0) && bPauseMenu == 0) {  //ENTER
    iMenuSelectStep = iMenuSelectStep / 10;
    iMenuSelect = iMenuSelect + iMenuSelectStep;
    //Serial.println("Menu Select:"+String(iMenuSelect)+", MenuStep:"+String(iMenuSelectStep) );
  }

    //Serial.println("Menu Select:"+String(iMenuSelect)+", MenuStep:"+String(iMenuSelectStep)+", PauseMenu:"+String(bPauseMenu) );
  
  if (iMenuSelect == 1000) {
    pMainMenu1000();   
  }
  if ((iMenuSelect == 2000) && (bpHDisplayUpdate==0)) { //Display Current pH
//    pMainMenu2000();   
  }
  if (iMenuSelect == 2100) {
//     pMainMenu2100();
     //Serial.println("Menu Select:"+String(iMenuSelect)+", MenuStep:"+String(iMenuSelectStep) );

  }   
  if (iMenuSelect == 3000) {
    pMainMenu3000();   
  }
  if (iMenuSelect == 3100) {
    pMainMenu3100();   
  }
  if (iMenuSelect == 3110) {
    pMainMenu3110();   
  }
  if (iMenuSelect == 3200) {
    pMainMenu3200();   
  }
  if (iMenuSelect == 3210) {
    pMainMenu3210();   
  }
  if (iMenuSelect == 3300) {
    pMainMenu3300();   
  }
  if (iMenuSelect == 3310) {
      pMainMenu3310();   
  }
  if (iMenuSelect == 4000) {  // Base Pump
    pMainMenu4000();   
  }
  if (iMenuSelect == 4100) {  // Base Pump
    pMainMenu4100();   
  }
  if (iMenuSelect == 5000) {   //Acid Pump
    pMainMenu5000();   
  }
  if (iMenuSelect == 5100) {   //Acid Pump
    pMainMenu5100();   
  }
  if (iMenuSelect == 6000) {   //Prime Base Line
    pMainMenu6000();   
  }
  if (iMenuSelect == 6100) {   //Prime Base Line
    pMainMenu6100();   
  }
  if (iMenuSelect == 6110) {   //Prime Base Line
    pMainMenu6110();   
  }
  if (iMenuSelect == 7000) {   //Prim Acid line
    pMainMenu7000();   
  }
  if (iMenuSelect == 7100) {   //Prime Acid line
    pMainMenu7100();   
  }
  if (iMenuSelect == 7110) {   //Prime Acid line
    pMainMenu7110();   
  }
  if (iMenuSelect == 8000) {   //Dosing Delay
    pMainMenu8000();   
  }
  if (iMenuSelect == 8100) {   //Dosing Delay
    pMainMenu8100();   
  }
  iPrevMenuSelect = iMenuSelect;
   
}
 
void pMainMenu1000() {
  lcd.setCursor ( 0, 0 );        // go to the next line
  lcd.print("Water Qty:"+String(iWtrQty)+"    ");  

  lcd.setCursor ( 0, 1 );        // go to the next line
  lcd.print("Nut:Water:"+String(iNutrient_to_Water)+" ");  
  lcd.setCursor ( 12, 1 );        // go to the next line
  lcd.print("ml/l");  

  bpHDisplayUpdate = 1;
  //Serial.println("Current PH:"+String(dCurrentpH));
  iMenuSelectStep = 1000;

}  
void pMainMenu1100() {
  iMenuSelect = 1000;
  iMenuSelectStep = 1000;

}

void pMainMenu2000() {  // Set pH Limits
  lcd.setCursor ( 0, 0 );        // go to the next line
  lcd.print("Set Water Qty   ");  
  lcd.setCursor ( 0, 1 );        // go to the next line
  lcd.print("Qty:"+String(iWtrQty)+"          ");  
}  

void pMainMenu2100() {  // Set pH Limits
  lcd.setCursor ( 0, 0 );        // go to the next line
  lcd.print("Lower pH Limit: ");  
  lcd.setCursor ( 0, 1 );        // go to the next line
  lcd.print(String(dpHLower)+"            ");
  iMenuSelectMin = 2100; 
  iMenuSelectMax = 2300; 
  
}  

void pMainMenu2110() {  // Set pH Limits
  if (bPauseMenu == 0) {
    bPauseMenu = 1;
    lcd.setCursor ( 0, 0 );        // go to the next line
    lcd.print("Set Lower pH:   ");  
  }
  else {
  if ((A7_VAL > 500) && (A7_VAL < 550)) {  //UP
    dpHLower = dpHLower - 0.1;
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print(String(dpHLower)+"            ");
    //Serial.println("Menu Select:"+String(iMenuSelect)+", MenuStep:"+String(iMenuSelectStep) );
  }
  else if ((A7_VAL > 630) && (A7_VAL < 730))  { //DOWN
    dpHLower = dpHLower + 0.1;
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print(String(dpHLower)+"            ");
    //Serial.println("Menu Select:"+String(iMenuSelect)+", MenuStep:"+String(iMenuSelectStep) );
  }
  else if ((A7_VAL >= 0) && (A7_VAL < 50)) {  //ENTER
    iMenuSelectStep = 100;
    iMenuSelect = 2100;
    iMenuSelectMin = 2100;
    iMenuSelectMax = 2200;
    bPauseMenu = 0;
    //Serial.println("Menu Select:"+String(iMenuSelect)+", MenuStep:"+String(iMenuSelectStep)+", PauseMenu:"+String(bPauseMenu) );
  }
  }
}  

void pMainMenu2300() {  // Set pH Limits Exit
  lcd.setCursor ( 0, 0 );        // go to the next line
  lcd.print("Return To Main  ");  
  lcd.setCursor ( 0, 1 );        // go to the next line
  lcd.print("Enter to Exit   ");
}  

void pMainMenu2310() {
  iMenuSelect = 2000;
  iMenuSelectStep = 1000;
  iMenuSelectMin = 1000; 
  iMenuSelectMax = 8000; 
}  


void pMainMenu3000() {  // Set pH Limits
  lcd.setCursor ( 0, 0 );        // go to the next line
  lcd.print("Set pH Limits   ");  
  lcd.setCursor ( 0, 1 );        // go to the next line
  lcd.print("Lmts:"+String(dpHLower)+" ~ "+String(dpHUpper));  
}  

void pMainMenu3100() {  // Set pH Limits
  lcd.setCursor ( 0, 0 );        // go to the next line
  lcd.print("Lower pH Limit: ");  
  lcd.setCursor ( 0, 1 );        // go to the next line
  lcd.print(String(dpHLower)+"            ");
  iMenuSelectMin = 3100; 
  iMenuSelectMax = 3300; 
  
}  

void pMainMenu3110() {  // Set pH Limits
  if (bPauseMenu == 0) {
    bPauseMenu = 1;
    lcd.setCursor ( 0, 0 );        // go to the next line
    lcd.print("Set Lower pH:   ");  
  }
  else {
  if ((A7_VAL > 500) && (A7_VAL < 550)) {  //UP
    dpHLower = dpHLower - 0.1;
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print(String(dpHLower)+"            ");
    //Serial.println("Menu Select:"+String(iMenuSelect)+", MenuStep:"+String(iMenuSelectStep) );
  }
  else if ((A7_VAL > 630) && (A7_VAL < 730))  { //DOWN
    dpHLower = dpHLower + 0.1;
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print(String(dpHLower)+"            ");
    //Serial.println("Menu Select:"+String(iMenuSelect)+", MenuStep:"+String(iMenuSelectStep) );
  }
  else if ((A7_VAL >= 0) && (A7_VAL < 50)) {  //ENTER
    iMenuSelectStep = 100;
    iMenuSelect = 3100;
    iMenuSelectMin = 3100;
    iMenuSelectMax = 3300;
    bPauseMenu = 0;
    //Serial.println("Menu Select:"+String(iMenuSelect)+", MenuStep:"+String(iMenuSelectStep)+", PauseMenu:"+String(bPauseMenu) );
  }
  }
//  iMenuSelectMin = 3110; 
//  iMenuSelectMax = 3110; 
}  

void pMainMenu3200() {  // Set pH Limits
  lcd.setCursor ( 0, 0 );        // go to the next line
  lcd.print("Upper pH Limit: ");  
  lcd.setCursor ( 0, 1 );        // go to the next line
  lcd.print(String(dpHUpper)+"            ");
}  
void pMainMenu3210() {  // Set pH Limits
  if (bPauseMenu == 0) {
    bPauseMenu = 1;
    lcd.setCursor ( 0, 0 );        // go to the next line
    lcd.print("Set Upper pH    ");  
  }
  else {
  if ((A7_VAL > 500) && (A7_VAL < 550)) {  //UP
    dpHUpper = dpHUpper - 0.1;
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print(String(dpHUpper)+"            ");
    //Serial.println("Menu Select:"+String(iMenuSelect)+", MenuStep:"+String(iMenuSelectStep) );
  }
  else if ((A7_VAL > 630) && (A7_VAL < 730))  { //DOWN
    dpHUpper = dpHUpper + 0.1;
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print(String(dpHUpper)+"            ");
    //Serial.println("Menu Select:"+String(iMenuSelect)+", MenuStep:"+String(iMenuSelectStep) );
  }
  else if ((A7_VAL >= 0) && (A7_VAL < 50)) {  //ENTER
    iMenuSelectStep = 100;
    iMenuSelect = 3200;
    iMenuSelectMin = 3100;
    iMenuSelectMax = 3300;
    bPauseMenu = 0;
    //Serial.println("Menu Select:"+String(iMenuSelect)+", MenuStep:"+String(iMenuSelectStep)+", MenuMax:"+String(iMenuSelectMax) );
  }
  }
}  

void pMainMenu3300() {  // Set pH Limits Exit
  lcd.setCursor ( 0, 0 );        // go to the next line
  lcd.print("Return To Main  ");  
  lcd.setCursor ( 0, 1 );        // go to the next line
  lcd.print("Enter to Exit   ");
}  

void pMainMenu3310() {
  iMenuSelect = 3000;
  iMenuSelectStep = 1000;
  iMenuSelectMin = 1000; 
  iMenuSelectMax = 8000; 
}  

void pMainMenu4000() {
  lcd.setCursor ( 0, 0 );        // go to the next line
  lcd.print("Base Pump       ");  
  lcd.setCursor ( 0, 1 );        // go to the next line
  lcd.print("Set dosing timer");  
}  
void pMainMenu4100() {  // 
  if (bPauseMenu == 0) {
    lcd.setCursor ( 0, 0 );        // go to the next line
    lcd.print("Pump On Timer:  ");  
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print("                ");
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print(iBasePumpTimer);
    bPauseMenu = 1;
  }
  else if ((A7_VAL > 500) && (A7_VAL < 550)) {  //UP
    if (iBasePumpTimer > 0) {
      iBasePumpTimer = iBasePumpTimer - 1;
    }  
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print("  ");
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print(iBasePumpTimer);
  }
  else if ((A7_VAL > 630) && (A7_VAL < 730))  { //DOWN
    if (iBasePumpTimer < 20) {
      iBasePumpTimer = iBasePumpTimer + 1;
    }
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print("  ");
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print(iBasePumpTimer);
  }
  else if ((A7_VAL >= 0) && (A7_VAL < 50)) {  //ENTER
    iMenuSelectStep = 1000;
    iMenuSelect = 4000;
    iMenuSelectMin = 1000;
    iMenuSelectMax = 8000;
    bPauseMenu = 0;
  }
}  



void pMainMenu5000() {
  lcd.setCursor ( 0, 0 );        // go to the next line
  lcd.print("Acid Pump       ");  
  lcd.setCursor ( 0, 1 );        // go to the next line
  lcd.print("Set dosing timer");  
}  
void pMainMenu5100() {  // 
  if (bPauseMenu == 0) {
    lcd.setCursor ( 0, 0 );        // go to the next line
    lcd.print("Pump On Timer:  ");  
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print("                ");
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print(iAcidPumpTimer);
    bPauseMenu = 1;
  }
  else if ((A7_VAL > 500) && (A7_VAL < 550)) {  //UP
    if (iAcidPumpTimer > 0) {
      iAcidPumpTimer = iAcidPumpTimer - 1;
    }  
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print("  ");
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print(iAcidPumpTimer);
  }
  else if ((A7_VAL > 630) && (A7_VAL < 730))  { //DOWN
    if (iAcidPumpTimer < 20) {
      iAcidPumpTimer = iAcidPumpTimer + 1;
    }
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print("  ");
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print(iAcidPumpTimer);
  }
  else if ((A7_VAL >= 0) && (A7_VAL < 50)) {  //ENTER
    iMenuSelectStep = 1000;
    iMenuSelect = 5000;
    iMenuSelectMin = 1000;
    iMenuSelectMax = 8000;
    bPauseMenu = 0;
  }  
}  

void pMainMenu6000() {
  lcd.setCursor ( 0, 0 );        // go to the next line
  lcd.print("Prime Base Line ");  
  lcd.setCursor ( 0, 1 );        // go to the next line
  lcd.print("Enter to start  ");  
}  
void pMainMenu6100() {  // 
    lcd.setCursor ( 0, 0 );        // go to the next line
    lcd.print("Prime Base Line ");  
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print("Enter to stop   ");
   digitalWrite(PUMP_D5, HIGH);  //ON
}  
void pMainMenu6110() {  // 
    lcd.setCursor ( 0, 0 );        // go to the next line
    lcd.print("Prime Base Line ");  
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print("Done            ");
    digitalWrite(PUMP_D5, LOW);  //OFF
    iMenuSelect = 6000;
    iMenuSelectStep = 1000;

}  
void pMainMenu7000() {
  lcd.setCursor ( 0, 0 );        // go to the next line
  lcd.print("Prime Acid Line ");  
  lcd.setCursor ( 0, 1 );        // go to the next line
  lcd.print("Enter to start  ");  
}  
void pMainMenu7100() {  // 
    lcd.setCursor ( 0, 0 );        // go to the next line
    lcd.print("Prime Acid Line ");  
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print("Enter to stop   ");
   digitalWrite(PUMP_D6, HIGH);  //ON
}  
void pMainMenu7110() {  // 
    lcd.setCursor ( 0, 0 );        // go to the next line
    lcd.print("Prime Acid Line ");  
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print("Done            ");
    digitalWrite(PUMP_D6, LOW);  //OFF
    iMenuSelect = 7000;
    iMenuSelectStep = 1000;

}  

void pMainMenu8000() {
  lcd.setCursor ( 0, 0 );        // go to the next line
  lcd.print("Dosing Delay    ");  
  lcd.setCursor ( 0, 1 );        // go to the next line
  lcd.print("Set Dosing Delay");  
}  

void pMainMenu8100() {  // 
  if (bPauseMenu == 0) {
    lcd.setCursor ( 0, 0 );        // go to the next line
    lcd.print("Dosing Delay:   ");  
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print("                ");
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print(iPumpWaitTimerMax);
    bPauseMenu = 1;
  }
  else if ((A7_VAL > 500) && (A7_VAL < 550)) {  //UP
    if (iPumpWaitTimerMax > 0) {
      iPumpWaitTimerMax = iPumpWaitTimerMax - 1;
    }  
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print("   ");
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print(iPumpWaitTimerMax);
  }
  else if ((A7_VAL > 630) && (A7_VAL < 730))  { //DOWN
    if (iPumpWaitTimerMax < 180) {
      iPumpWaitTimerMax = iPumpWaitTimerMax + 1;
    }
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print("   ");
    lcd.setCursor ( 0, 1 );        // go to the next line
    lcd.print(iPumpWaitTimerMax);
  }
  else if ((A7_VAL >= 0) && (A7_VAL < 50)) {  //ENTER
    iMenuSelectStep = 1000;
    iMenuSelect = 8000;
    iMenuSelectMin = 1000;
    iMenuSelectMax = 8000;
    bPauseMenu = 0;
  }
}  


ISR(TIMER0_COMPA_vect){//timer0 interrupt 2kHz toggles pin 8
//generates pulse wave of frequency 2kHz/2 = 1kHz (takes two cycles for full wave- toggle high then toggle low)

}

ISR(TIMER1_COMPA_vect){//timer1 interrupt 1Hz toggles pin 13 (LED)
//generates pulse wave of frequency 1Hz/2 = 0.5Hz (takes two cycles for full wave- toggle high then toggle low)
if (bSec == 0) {     
 bSec = 1;
 if (bBackLight > 0) {
    bBackLight--;
 }
 if (bWait > 0) {
    bWait--;
 }
 if (bpHDisplayUpdate > 0){
  bpHDisplayUpdate--;
 }
 if (iBasePumpTimerCnt > 0) {
  iBasePumpTimerCnt--;
 }
 if (iAcidPumpTimerCnt > 0) {
  iAcidPumpTimerCnt--;
 }
 if (ipHTestCnt > 0) {
  ipHTestCnt--;
 }
 if (iBasePumpWaitTimer > 0) {
  iBasePumpWaitTimer--;
 }
 if (iAcidPumpWaitTimer > 0) {
  iAcidPumpWaitTimer--;
 }
}
else {
  bSec--;
}
}

  
ISR(TIMER2_COMPA_vect){//timer1 interrupt 8kHz toggles pin 9
//generates pulse wave of frequency 8kHz/2 = 4kHz (takes two cycles for full wave- toggle high then toggle low)
 if (bMenuTimer > 0) {
  bMenuTimer--;
 } 
 if (ipHCalibrateCnt > 0) {
  ipHCalibrateCnt--;
 }
 if (bPumpMenuCnt > 0 ) {
  bPumpMenuCnt--; 
 }
 if (ipHReadCnt > 0) {
  ipHReadCnt--;
 }
}