#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 20 chars and 4 line display
Adafruit_SSD1306 display(128, 64, &Wire, -1);

//Counters to change positions of pages and sub-menus

int page_counter=1 ;       //To move beetwen pages
int subpage_counter=0;    //To move submenu 1 valve1
int subpage2_counter=0;   //To move submenu 2 drop1


//-------Pins-----//
int up = 19;               //Up/Yes button 
int sel = 18;             //Select button
int down = 5;           //Down/No button
int valve = 26;            //valve 1
int trigger = 27;          //Trigger
//---------Storage states of buttons for debounce function-----//
boolean current_up = LOW;          
boolean last_up=LOW;            
boolean current_sel = LOW;
boolean last_sel = LOW;
boolean last_down = LOW;
boolean current_down = LOW;
boolean continue_up = LOW;
boolean continue_down =LOW;

//--------Valve states-----------//
int drop_1 = 200;
int drop_2 = 200;
int drop_3 = 200;
int delay_1 = 200;
int delay_2 = 200;
int delay_test = 250;
int valvesel1 =0;
int valvesel2 =0;
int valvesel3 =0;
int valve_cycle =1;
int trigger_1 =200;
int var=0;
int var2=0;


        


//Custom return char
byte back[8] = {
  0b00100,
  0b01000,
  0b11111,
  0b01001,
  0b00101,
  0b00001,
  0b00001,
  0b11111
};

//Custom arrow char
byte arrow[8] = {
  0b01000,
  0b00100,
  0b00010,
  0b11111,
  0b00010,
  0b00100,
  0b01000,
  0b00000
};

void setup() {
  // Declare pin modes
  pinMode(valve,OUTPUT);
  pinMode(trigger,OUTPUT);

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.clearDisplay();

  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(20, 10);
  display.println("Simple Dropper");
  display.setCursor(58, 25);
  display.println("V3");
  display.setCursor(30, 52);
  display.println("By Jan Kops");
  display.display(); 
  delay(2000);
  display.clearDisplay();
  display.display(); 
}


   //---- De-bouncing function for all buttons----//
boolean debounce(boolean last, int pin)
{
boolean current = digitalRead(pin);
if (last != current)
{
delay(10);
current = digitalRead(pin);
}
return current;
}


void loop() {
current_up = debounce(last_up, up);         //Debounce for Up button
current_sel = debounce(last_sel, sel);      //Debounce for Select  button
current_down = debounce(last_down, down);   //Debounce for Down button

//----Page counter function to move pages----//

if(subpage_counter==0 && subpage2_counter==0){                 // up/down buttons enabled if subcounters are 0,Disabled if 1,2..etc to work on submenus
  
//Page Up
    if (last_up== LOW && current_up == HIGH){ //Up button pressed
      display.clearDisplay();
      display.display();                             //Clear lcd if page is changed to print new one
      if(page_counter <8){              //Page counter never higher than 3(total of pages)
      page_counter= page_counter +1;   //Page up
      
      }
      else{
      page_counter= 1;                 //If higher than 3 (last page) stay on page 3(change to 1 if you want to rotate)
      }
  
}

 
last_up = current_up;                 //Save up button last state 

//Page Down
    if (last_down== LOW && current_down == HIGH){//Down button pressed
      display.clearDisplay();
      display.display();                       //Clear lcd if page is changed to print new one
      if(page_counter >1){              //Page counter never lower than 1 (total of pages)
      page_counter= page_counter -1;   //Page down
      
      }
      else{
      page_counter= 8;                 //If lower than 1(first page) stay on page 1(change to 3 if you want to rotate)
      }
  }
    
    last_down = current_down;         //Save down button last state
}
//------- Switch function to write and show what you want---// 
  switch (page_counter) {
   
case 1: {   //Design of page 1
     //Static objects
     display.clearDisplay();
     display.setCursor(0, 10);
     display.println("Drop Select");
     display.setCursor(5, 20);
     display.println("1th");
     display.setCursor(5, 30);
     display.println("2nd");
     display.setCursor(5, 40);
     display.println("3rd");
     display.setCursor(64, 20);
     display.println(drop_1);
     display.setCursor(64, 30);
     display.println(drop_2);
     display.setCursor(64, 40);
     display.println(drop_3);
     

     // Sub counter 1 control
     if (last_sel== LOW && current_sel == HIGH){ //select button pressed
     if(subpage2_counter <4){                    // subpage counter never higher than 2(total of items)
     subpage2_counter ++;                         //subcounter to move beetwen submenu
     }
     else{                                       //If subpage higher than 2 (total of items) return to first item
      subpage2_counter=1;
     }
     }
     last_sel=current_sel;                      //Save last state of select button

     //First item control(subpage1_counter =1) Drop 1
     if(subpage2_counter==1){
    
     display.setCursor(100, 20);
     display.println("*");

     //Control drop_1 variable
     if (last_up== LOW && current_up == HIGH){  //Up +
     if(drop_1 < 1000){                         //drop_1 never higher than 1000 (max value)
     drop_1 += 1 ;
     }
     else{
     drop_1 = 0;                              //If drop_1 higher than 1000, return to 0
     }
     }
     last_up=current_up;
     
     
     if(last_down== LOW && current_down == HIGH){  //Down -
     if(drop_1 >0){                              //drop_1 never lower than 0
     drop_1 -=1;                                   
     }
     else{
     drop_1 = 0;                                 
     }
     }
     last_down=current_down;

     if (last_up== HIGH && continue_up == HIGH){  //Up +
     if(drop_1 < 1000){                         //drop_1 never higher than 1000 (max value)
     drop_1 += 1 ;
     }
     else{
     drop_1 = 0;                              //If drop_1 higher than 1000, return to 0
     }
     }
     last_up=continue_up;
     
     
     if(last_down== HIGH && continue_down == HIGH){  //Down -
     if(drop_1 >0){                              //drop_1 never lower than 0
     drop_1 -=1;                                 
     }
     else{
     drop_1 = 0;                                 
     }
     }
     last_down=continue_down;
     
     }


     //2nd item control(subpage1_counter =2) Drop 2
     if(subpage2_counter==2){
     display.setCursor(100, 30);
     display.println("*");
     
     //Control drop_2 variable
     if (last_up== LOW && current_up == HIGH){  //Up +
     if(drop_2 < 1000){                         //drop_2 never higher than 1000 (max value)
     drop_2 += 1 ;
     }
     else{
     drop_2 = 0;                              //If drop_2 higher than 1000, return to 0
     }
     }
     last_up=current_up;
     
     
     
     if(last_down== LOW && current_down == HIGH){  //Down -
     if(drop_2 >0){                              //drop_2 never lower than 0
     drop_2 -=1;                                   
     }
     else{
     drop_2 = 0;                                 
     }
     }
     last_down=current_down;

     if (last_up== HIGH && continue_up == HIGH){  //Up +
     if(drop_1 < 1000){                         //drop_1 never higher than 1000 (max value)
     drop_1 += 1 ;
     }
     else{
     drop_1 = 0;                              //If drop_1 higher than 1000, return to 0
     }
     }
     last_up=continue_up;
     
     
     if(last_down== HIGH && continue_down == HIGH){  //Down -
     if(drop_1 >0){                              //drop_1 never lower than 0
     drop_1 -=1;                                 
     }
     else{
     drop_1 = 0;                                 
     }
     }
     last_down=continue_down;
     
     }


     //3rd item control(subpage1_counter =3) Drop 3
     if(subpage2_counter==3){
     display.setCursor(100, 40);
     display.println("*"); 
     
     //Control drop_3 variable
     if (last_up== LOW && current_up == HIGH){  //Up +
     if(drop_3 < 1000){                         //drop_3 never higher than 1000 (max value)
     drop_3 += 1 ;
     }
     else{
     drop_3 = 0;                              //If drop_3 higher than 1000, return to 0
     }
     }
     last_up=current_up;
     
     
     if(last_down== LOW && current_down == HIGH){  //Down -
     if(drop_3 >0){                              //drop_3 never lower than 0
     drop_3 -=1;                                   
     }
     else{
     drop_3 = 0;                                 
     }
     }
     last_down=current_down;

     if (last_up== HIGH && continue_up == HIGH){  //Up +
     if(drop_1 < 1000){                         //drop_1 never higher than 1000 (max value)
     drop_1 += 1 ;
     }
     else{
     drop_1 = 0;                              //If drop_1 higher than 1000, return to 0
     }
     }
     last_up=continue_up;
     
     
     if(last_down== HIGH && continue_down == HIGH){  //Down -
     if(drop_1 >0){                              //drop_1 never lower than 0
     drop_1 -=1;                                 
     }
     else{
     drop_1 = 0;                                 
     }
     }
     last_down=continue_down;
     
     }
  
     //quit submenu
        
     //Second item control (subpage1_counter==2) back
     if(subpage2_counter==4){
     if (last_up== LOW && current_up == HIGH){   
     subpage2_counter=0;                       //Exit submenu, up/down pages enabled
     }
     last_up=current_up;
     
     if(last_down== LOW && current_down == HIGH){ 
     subpage2_counter=1;                        //Stay on sub menu, return to valve1 control
     }
     last_down=current_down;
     }
     
    display.display(); 
    }//case 1 end
    break;

case 2: {   //Design of page 2
     //Static objects
     display.clearDisplay();
     display.setCursor(0, 10);
     display.println("Delay");
     display.setCursor(5, 20);
     display.println("1th");
     display.setCursor(5, 30);
     display.println("2nd");
     
     display.setCursor(64, 20);
     display.println(delay_1);
     display.setCursor(64, 30);
     display.println(delay_2);
     // Sub counter 1 control
     if (last_sel== LOW && current_sel == HIGH){ //select button pressed
     if(subpage2_counter <3){                    // subpage counter never higher than 2(total of items)
     subpage2_counter ++;                         //subcounter to move beetwen submenu
     }
     else{                                       //If subpage higher than 2 (total of items) return to first item
      subpage2_counter=1;
     }
     }
     last_sel=current_sel;                      //Save last state of select button

     //First item control(subpage1_counter =1) Drop 1
     if(subpage2_counter==1){
     display.setCursor(100, 20);
     display.println("*");
     
     //Control delay_1 variable
     if (last_up== LOW && current_up == HIGH){  //Up +
     if(delay_1 < 1000){                         //delay_1 never higher than 1000 (max value)
     delay_1 += 1 ;
     }
     else{
     delay_1 = 0;                              //If delay_1 higher than 1000, return to 0
     }
     }
     last_up=current_up;
     
     
     if(last_down== LOW && current_down == HIGH){  //Down -
     if(delay_1 >0){                              //delay_1 never lower than 0
     delay_1 -=1;                                   
     }
     else{
     delay_1 = 0;                                 
     }
     }
     last_down=current_down;

     if (last_up== HIGH && continue_up == HIGH){  //Up +
     if(drop_1 < 1000){                         //drop_1 never higher than 1000 (max value)
     drop_1 += 1 ;
     }
     else{
     drop_1 = 0;                              //If drop_1 higher than 1000, return to 0
     }
     }
     last_up=continue_up;
     
     
     if(last_down== HIGH && continue_down == HIGH){  //Down -
     if(drop_1 >0){                              //drop_1 never lower than 0
     drop_1 -=1;                                 
     }
     else{
     drop_1 = 0;                                 
     }
     }
     last_down=continue_down;
     
     }


     //2nd item control(subpage1_counter =2) Drop 2
     if(subpage2_counter==2){
     display.setCursor(100, 30);
     display.println("*");
     
     //Control delay_2 variable
     if (last_up== LOW && current_up == HIGH){  //Up +
     if(delay_2 < 1000){                         //delay_2 never higher than 1000 (max value)
     delay_2 += 1 ;
     }
     else{
     delay_2 = 0;                              //If delay_2 higher than 1000, return to 0
     }
     }
     last_up=current_up;
     
     
     if(last_down== LOW && current_down == HIGH){  //Down -
     if(delay_2 >0){                              //delay_2 never lower than 0
     delay_2 -=1;                                   
     }
     else{
     delay_2 = 0;                                 
     }
     }
     last_down=current_down;

     if (last_up== HIGH && continue_up == HIGH){  //Up +
     if(drop_1 < 1000){                         //drop_1 never higher than 1000 (max value)
     drop_1 += 1 ;
     }
     else{
     drop_1 = 0;                              //If drop_1 higher than 1000, return to 0
     }
     }
     last_up=continue_up;
     
     
     if(last_down== HIGH && continue_down == HIGH){  //Down -
     if(drop_1 >0){                              //drop_1 never lower than 0
     drop_1 -=1;                                 
     }
     else{
     drop_1 = 0;                                 
     }
     }
     last_down=continue_down;
     
     }


     //quit submenu
        
     //Second item control (subpage1_counter==2) back
     if(subpage2_counter==3){
     if (last_up== LOW && current_up == HIGH){
     subpage2_counter=0;                       //Exit submenu, up/down pages enabled
     }
     last_up=current_up;
     
     if(last_down== LOW && current_down == HIGH){      
     subpage2_counter=1;                        //Stay on sub menu, return to valve1 control
     }
     last_down=current_down;
     }
     
    }//case 2 end
    display.display();
    break;

 case 3: {   //Design of page 3
     //Static objects
     display.clearDisplay();
     display.setCursor(0, 10);
     display.println("Camera Delay");
     display.setCursor(5, 20);
     display.println(trigger_1);
          // Sub counter 1 control
     if (last_sel== LOW && current_sel == HIGH){ //select button pressed
     if(subpage2_counter <2){                    // subpage counter never higher than 2(total of items)
     subpage2_counter ++;                         //subcounter to move beetwen submenu
     }
     else{                                       //If subpage higher than 2 (total of items) return to first item
      subpage2_counter=1;
     }
     }
     last_sel=current_sel;                      //Save last state of select button

     //First item control(subpage1_counter =1) trigger_1
     if(subpage2_counter==1){
     display.setCursor(100, 20);
     display.println("*");
     
     //Control trigger_1 variable
     if (last_up== LOW && current_up == HIGH){  //Up +
     if(trigger_1 < 1000){                         //trigger_1 never higher than 1000 (max value)
    trigger_1 += 1 ;
     }
     else{
     trigger_1 = 0;                              //If trigger_1 higher than 1000, return to 0
     }
     }
     last_up=current_up;
     
     
     if(last_down== LOW && current_down == HIGH){  //Down -
     if(trigger_1 >0){                              //trigger_1 never lower than 0
    trigger_1 -=1;                                   
     }
     else{
     trigger_1 = 0;                                 
     }
     }
     last_down=current_down;

     if (last_up== HIGH && continue_up == HIGH){  //Up +
     if(trigger_1 < 1000){                         //trigger_1 never higher than 1000 (max value)
     trigger_1 += 1 ;
     }
     else{
     trigger_1 = 0;                              //If trigger_1 higher than 1000, return to 0
     }
     }
     last_up=continue_up;
     
     
     if(last_down== HIGH && continue_down == HIGH){  //Down -
     if(trigger_1 >0){                              //trigger_1 never lower than 0
     trigger_1 -=1;                                 
     }
     else{
     trigger_1 = 0;                                 
     }
     }
     last_down=continue_down;
     
     }

     //quit submenu
        
     //Second item control (subpage1_counter==2) back
     if(subpage2_counter==2){
     lcd.setCursor(16,1);
     lcd.print(" ");                           //Delete last arrow position 
     if (last_up== LOW && current_up == HIGH){
     subpage2_counter=0;                       //Exit submenu, up/down pages enabled
     }
     last_up=current_up;
     
     if(last_down== LOW && current_down == HIGH){
     subpage2_counter=1;                        //Stay on sub menu, return to valve1 control
     }
     last_down=current_down;
     }
     
     display.display();
    }//case 3 end
    break;

case 4: {   //Design of page 5
     //Static objects 
     lcd.setCursor(2,0);
     lcd.print("Release 2 drops");
     lcd.setCursor(7,2);
          }
     lcd.print("Ready");
     
     // Sub counter 1 control
     if (last_sel== LOW && current_sel == HIGH){ //select button pressed
   while (var < valve_cycle) {
   digitalWrite(valve, HIGH);
     delay(drop_1);
     digitalWrite(valve, LOW);
     delay(delay_1);
     digitalWrite(valve, HIGH);
     delay(drop_2);
     digitalWrite(valve, LOW);
     delay(trigger_1);
     digitalWrite(trigger, HIGH);
     delay(500);
     digitalWrite(trigger, LOW);
   delay(50);
   var++;
   }
     var=0;
     
     
     //Second item control (subpage1_counter==2) back
     if(subpage2_counter==2){
     lcd.setCursor(6,1);
     lcd.print(" ");                           //Delete last arrow position                    
     lcd.setCursor(14,1);                      //Place the arrow
     lcd.write(byte(2));                      
     if (last_up== LOW && current_up == HIGH){ 
     subpage2_counter=0;                       //Exit submenu, up/down pages enabled
     lcd.setCursor(14,1);
     lcd.print(" ");
     }
     last_up=current_up;
     
     if(last_down== LOW && current_down == HIGH){
     subpage2_counter=1;                        //Stay on sub menu, return to int valve_cycle control
     }
     last_down=current_down;
     }
     
    }//case 4 end
    break;

case 5: {   //Design of page 7
     //Static objects 
     lcd.setCursor(2,0);
     lcd.print("Release 3 drops");
     lcd.setCursor(7,2);
          }
     lcd.print("Ready");
     
     // Sub counter 1 control
     if (last_sel== LOW && current_sel == HIGH){ //select button pressed
   while (var < valve_cycle) {
   digitalWrite(valve, HIGH);
     delay(drop_1);
     digitalWrite(valve, LOW);
     delay(delay_1);
   digitalWrite(valve, HIGH);
     delay(drop_2);
     digitalWrite(valve, LOW);
     delay(delay_2);
     digitalWrite(valve, HIGH);
     delay(drop_3);
     digitalWrite(valve, LOW);

     delay(trigger_1);
     digitalWrite(trigger, HIGH);
     delay(500);
     digitalWrite(trigger, LOW);
   delay(50);
   var++;
   }
     var=0;
     
     
     //Second item control (subpage1_counter==2) back
     if(subpage2_counter==2){
     if (last_up== LOW && current_up == HIGH){ 
     subpage2_counter=0;                       //Exit submenu, up/down pages enabled
     }
     last_up=current_up;
     
     if(last_down== LOW && current_down == HIGH){
     subpage2_counter=1;                        //Stay on sub menu, return to int valve_cycle control
     }
     last_down=current_down;
     }
     
    }//case 5 end
    break;

case 6: {   //Design of page 8
     //Static objects
     lcd.setCursor(5,0);
     lcd.print("Test drop");
     lcd.setCursor(8,2);
     lcd.print("Run");

     // Sub counter 1 control
     if (last_sel== LOW && current_sel == HIGH){ //select button pressed
     if(subpage2_counter <2){                    // subpage counter never higher than 2(total of items)
     subpage2_counter ++;                         //subcounter to move beetwen submenu
     }
     else{                                       //If subpage higher than 2 (total of items) return to first item
      subpage2_counter=1;
     }
     }
     last_sel=current_sel;                      //Save last state of select button

     //First item control(subpage1_counter =1) Drop 1
     if(subpage2_counter==1){
     lcd.setCursor(6,2);
     lcd.print("*");
     
     //Control drop_1 variable
     if (last_up== LOW && current_up == HIGH){  //Up +
     digitalWrite(valve, HIGH);
     delay(60);
     digitalWrite(valve, LOW);
     delay(250);
     }
     else{
     }
     }
     
     //quit submenu
        
     //Second item control (subpage1_counter==2) back
     if(subpage2_counter==2){
     lcd.setCursor(6,2);
     lcd.print(" ");                           //Delete last arrow position  
     if (last_up== LOW && current_up == HIGH){
     subpage2_counter=0;                       //Exit submenu, up/down pages enabled
     }
     last_up=current_up;
     
     if(last_down== LOW && current_down == HIGH){      
     subpage2_counter=1;                        //Stay on sub menu, return to valve1 control
     }
     last_down=current_down;
     }
     
    }//case 6 end
    break;

case 7: {   //Design of page 4
     //Static objects
     lcd.setCursor(0,0);
     lcd.print("Valve");
     lcd.setCursor(7,0);
     lcd.print("1th");
     lcd.setCursor(11,0);
     lcd.print("Delay");
     lcd.setCursor(7,1);
     if(drop_1 <100){    //To avoid "0" of number 10
     lcd.setCursor(7,1);
     lcd.print(" ");
     lcd.setCursor(8,1);
     }
     lcd.print(drop_1);
     lcd.setCursor(12,1);
     if(delay_test <100){    //To avoid "0" of number 10
     lcd.setCursor(12,1);
     lcd.print(" ");
     lcd.setCursor(13,1);
     }
     lcd.print(delay_test);
     lcd.setCursor(17,1);
     lcd.print("Run");
     

     // Sub counter 1 control
     if (last_sel== LOW && current_sel == HIGH){ //select button pressed
     if(subpage2_counter <4){                    // subpage counter never higher than 2(total of items)
     subpage2_counter ++;                         //subcounter to move beetwen submenu
     }
     else{                                       //If subpage higher than 2 (total of items) return to first item
      subpage2_counter=1;
     }
     }
     last_sel=current_sel;                      //Save last state of select button

     //First item control(subpage1_counter =1) Drop 1
     if(subpage2_counter==1){
     lcd.setCursor(6,1);
     lcd.print("*");
     
     //Control drop_1 variable
     if (last_up== LOW && current_up == HIGH){  //Up +
     if(drop_1 < 1000){                         //drop_1 never higher than 1000 (max value)
     drop_1 += 1 ;
     }
     else{
     drop_1 = 0;                              //If drop_1 higher than 1000, return to 0
     }
     }
     last_up=current_up;
     
     
     if(last_down== LOW && current_down == HIGH){  //Down -
     if(drop_1 >0){                              //drop_1 never lower than 0
     drop_1 -=1;                                   
     }
     else{
     drop_1 = 0;                                 
     }
     }
     last_down=current_down;

     if (last_up== HIGH && continue_up == HIGH){  //Up +
     if(drop_1 < 1000){                         //drop_1 never higher than 1000 (max value)
     drop_1 += 1 ;
     }
     else{
     drop_1 = 0;                              //If drop_1 higher than 1000, return to 0
     }
     }
     last_up=continue_up;
     
     
     if(last_down== HIGH && continue_down == HIGH){  //Down -
     if(drop_1 >0){                              //drop_1 never lower than 0
     drop_1 -=1;                                 
     }
     else{
     drop_1 = 0;                                 
     }
     }
     last_down=continue_down;
     
     }


     //2nd item control(subpage1_counter =2) Drop 2
     if(subpage2_counter==2){
     lcd.setCursor(6,1);
     lcd.print(" ");                           //Delete last arrow position              
     lcd.setCursor(11,1);
     lcd.print("*");
     
     //Control delay_test variable
if (last_up== LOW && current_up == HIGH){  //Up +
     if(delay_test < 1000){                         //delay_test never higher than 1000 (max value)
     delay_test += 1 ;
     }
     else{
     delay_test = 0;                              //If delay_test higher than 1000, return to 0
     }
     }
     last_up=current_up;
     
     
     if(last_down== LOW && current_down == HIGH){  //Down -
     if(delay_test >0){                              //delay_test never lower than 0
     delay_test -=1;                                   
     }
     else{
     delay_test = 0;                                 
     }
     }
     last_down=current_down;

     if (last_up== HIGH && continue_up == HIGH){  //Up +
     if(delay_test < 1000){                         //delay_test never higher than 1000 (max value)
     delay_test += 1 ;
     }
     else{
     delay_test = 0;                              //If delay_test higher than 1000, return to 0
     }
     }
     last_up=continue_up;
     
     
     if(last_down== HIGH && continue_down == HIGH){  //Down -
     if(delay_test >0){                              //delay_test never lower than 0
     delay_test -=1;                                 
     }
     else{
     delay_test = 0;                                 
     }
     }
     last_down=continue_down;
     
     }


     //3rd item control(subpage1_counter =3) Drop 3
     if(subpage2_counter==3){
     lcd.setCursor(11,1);
     lcd.print(" ");                           //Delete last arrow position              
     lcd.setCursor(16,1);
     lcd.print("*");
     
     //Control valvesel3 variable
     if (last_up== LOW && current_up == HIGH){
     digitalWrite(valve, HIGH);
     delay(drop_1);
     digitalWrite(valve, LOW);
     delay(delay_test);
     digitalWrite(trigger, HIGH);
     delay(500);
     digitalWrite(trigger, LOW);
   delay(50);
     }
     last_up=current_up;
     
     }
  
     //quit submenu
        
     //Second item control (subpage1_counter==2) back
     if(subpage2_counter==4){
     lcd.setCursor(16,1);
     lcd.print(" ");                           //Delete last arrow position  
     if (last_up== LOW && current_up == HIGH){
     subpage2_counter=0;                       //Exit submenu, up/down pages enabled
     }
     last_up=current_up;
     
     if(last_down== LOW && current_down == HIGH){    
     subpage2_counter=1;                        //Stay on sub menu, return to valve1 control
     }
     last_down=current_down;
     }
     
    }//case 7 end
    break;

case 8: {   //Design of page 8
     //Static objects
     lcd.setCursor(2,0);
     lcd.print("Empty Reservoar");
     lcd.setCursor(8,2);
     lcd.print("Run");

     // Sub counter 1 control
     if (last_sel== LOW && current_sel == HIGH){ //select button pressed
     if(subpage2_counter <2){                    // subpage counter never higher than 2(total of items)
     subpage2_counter ++;                         //subcounter to move beetwen submenu
     }
     else{                                       //If subpage higher than 2 (total of items) return to first item
      subpage2_counter=1;
     }
     }
     last_sel=current_sel;                      //Save last state of select button

     //First item control(subpage1_counter =1) Drop 1
     if(subpage2_counter==1){
     lcd.setCursor(6,2);
     lcd.print("*");
     
     //Control drop_1 variable
     if (last_up== LOW && current_up == HIGH){  //Up +
     digitalWrite(valve, HIGH);
      }
     if(last_down== LOW && current_down == HIGH){
     digitalWrite(valve, LOW);
     }
     else{
     }
     }
     
     //quit submenu
        
     //Second item control (subpage1_counter==2) back
     if(subpage2_counter==2){ 
     lcd.setCursor(6,2);
     lcd.print(" ");                           //Delete last arrow position  
     if (last_up== LOW && current_up == HIGH){  
     subpage2_counter=0;                       //Exit submenu, up/down pages enabled
     }
     last_up=current_up;
     
     if(last_down== LOW && current_down == HIGH){
  
     subpage2_counter=1;                        //Stay on sub menu, return to valve1 control
     }
     last_down=current_down;
     }
     
    }//case 8 end
    break;
  }//switch end
}//loop end