為什麼這樣不行!拜託大家幫忙看看 (Why doesn't this work! Please help everyone)

[jungbill]

#include "max6675.h"// this file is part of the library. See video for details
#include <LCD_I2C.h>
#include <Wire.h>
#define pwmPin 9
#define controlPin A3
const int SW = 2; //pin2並電阻10K在按鈕同側對側電容1n接G the number of the pushbutton pin
const int compin = 3;
const int timeupin = 12;
const int oilLosePin = 7;
const int oilHeaterPin =11;
const int refVolts=5; //使用 5V 參考電壓的 Arduino 開發板
//int oilLosePin=7; //LED 連接數位接腳 7
int val; //數位值
float volts;
//const int oilLoseVol = 7;
const unsigned long Debounce = 20;
const unsigned long LongPress = 800;
unsigned long ButtonStateChangeTime = 0; // Debounce timer
boolean ButtonWasPressed = false;
boolean Effect = false;
boolean EffectState = false;
//unsigned long oilsensorValue=0;
int Time_second;
int Time_minute;
int Time_hour;
const int baudRate = 9600;
long Time_hour_setting=3600000;
long Time_minute_setting=60000;
long Time_second_setting=1000;
LCD_I2C lcd(0x27, 16, 2);
unsigned long start_time;
int page_counter=1 ; //To move beetwen pages
unsigned long previousMillis = 0;
unsigned long interval = 5000; //Desired wait time 10 seconds
int up = 8; //Up button
int down = 10; //Down button
//---------Storage debounce function-----//

boolean current_up = LOW;
boolean last_up=LOW;
boolean last_down = LOW;
boolean current_down = LOW;
const int pressureInput = A0; //select the analog input pin for the pressure transducer
const int pressureZero = 160; //analog reading of pressure transducer at 0psi
const int pressureMax = 921.6; //analog reading of pressure transducer at 100psi
const int pressuretransducermaxPSI = 174; //psi value of transducer being used
const int pressureInput2 = A1; //select the analog input pin for the pressure transducer
const int pressureZero2 = 102.4; //analog reading of pressure transducer at 0psi
const int pressureMax2 = 921.6; //analog reading of pressure transducer at 100psi
const int pressuretransducermaxPSI2 = 435; //psi value of transducer being used
//const int baudRate = 9600; //constant integer to set the baud rate for serial monitor
const int sensorreadDelay = 250; //constant integer to set the sensor read delay in milliseconds
float pressureValue = 0; //variable to store the value coming from the pressure transducer
float pressureValue2 = 0;
int soPin = 6;// SO=Serial Out
int csPin = 5;// CS = chip select CS pin
int sckPin = 4;// SCK = Serial Clock pin
MAX6675 thermocouple(sckPin, csPin, soPin); //PIN4.5.6
void setup(){
pinMode(SW, INPUT);//PIN2
pinMode(compin, OUTPUT); //PIN3
pinMode(timeupin,INPUT_PULLUP);//PIN12
pinMode(pwmPin,OUTPUT);//PIN9
pinMode(oilLosePin ,OUTPUT);//PIN7
pinMode(oilHeaterPin, OUTPUT); //PIN11
//pinMode(oilLoseVol,INPUT); //PIN7
int timeupin =0;
//float voltage = 0;//int oilLosePin =0;
lcd.begin();
lcd.backlight();
lcd.print("GOOD LUCK"); //|
lcd.setCursor(0,1); //|
lcd.print(" Jung Bill ");
delay( 6000);
digitalWrite(SW,HIGH);
Serial.println("Start");
digitalWrite(compin, LOW);
Serial.begin(baudRate);
digitalWrite(oilLosePin,LOW);
digitalWrite(oilHeaterPin,LOW);

}
//---- De-bouncing function for all buttons----//
boolean debounce(boolean last, int pin)
{
boolean current = digitalRead(pin);
if (last != current)
{
delay(5);
current = digitalRead(pin);
}
return current;

}

void loop() {
int sensorValue = analogRead(A5);
// Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):
float voltage = sensorValue * (5.0 / 1023.0);
// print out the value you read:
Serial.println(voltage);
unsigned long currentTime = millis();
boolean buttonIsPressed = digitalRead(SW) == LOW; // Active LOW
// Check for button state change debounce.
if (buttonIsPressed != ButtonWasPressed &&
currentTime - ButtonStateChangeTime > Debounce) {
// Button state has changed.
ButtonWasPressed = buttonIsPressed;

if (ButtonWasPressed) {
  Serial.println("Press");
 // digitalWrite(compin, HIGH);
  //delay(1);
 // digitalWrite(compin, LOW);
}

else {

  //Released after 500ms has passed:
  if (currentTime - ButtonStateChangeTime >= LongPress) {
    Serial.println("Momentary");
  //  digitalWrite (LED, LOW);   
  }

  if (currentTime - ButtonStateChangeTime < LongPress && Effect == false) {
    Serial.println("Start Recycling");
    Effect = true;
  
    digitalWrite(compin, HIGH);

  }
  else {
    if (Effect == true) {
      Serial.println("Recycling End");
      Effect = false;        
    digitalWrite(compin, LOW);
    }
  }
}

//Time reset.
ButtonStateChangeTime = currentTime;
}
current_up = debounce(last_up, up); //Debounce for Up button
current_down = debounce(last_down, down); //Debounce for Down button

//Page Up
if (last_up== LOW && current_up == HIGH){
lcd.clear(); //When page is changed, lcd clear to print new page
if(page_counter <6){ //Page counter never higher than 3(total of pages)
page_counter= page_counter +1; //Page up
//delay(500);
}
else{
page_counter= 1; //return to page 1
}
}

last_up = current_up;

//Page Down
if (last_down== LOW && current_down == HIGH){
lcd.clear(); //When page is changed, lcd clear to print new page
if(page_counter >1){ //Page counter never lower than 1 (total of pages)
page_counter= page_counter -1; //Page down
// delay(500);
}
else{
page_counter= 6; //return to page 3
}
}

last_down = current_down;

//------ Switch function to write and show what you want---//

switch (page_counter) {

case 1:{     //Design of home page 1         
 int timeup= digitalRead(12); 
 if (timeup == HIGH){

start_time= currentTime ;
// start_time=millis();
Time_hour = start_time / Time_hour_setting; //小時

Time_minute = (start_time % Time_hour_setting) / Time_minute_setting; //分鐘

Time_second = ((start_time % Time_hour_setting) % Time_minute_setting) / Time_second_setting; //秒
// put your main code here, to run repeatedly:
lcd.setCursor(0,0);
lcd.print("Recycling TIME");
lcd.setCursor(3,1);
lcd.print(Time_hour);
lcd.print("Hr ");
lcd.print(Time_minute);
lcd.print("Min");
lcd.print(Time_second);
lcd.print("Sec");
delay(600);
}
}
break;
case 2: { //Design of page 2
pressureValue = analogRead(pressureInput); //reads value from input pin and assigns to variable
pressureValue = ((pressureValue-pressureZero)*pressuretransducermaxPSI)/(pressureMax-pressureZero); //conversion equation to convert analog reading to psi
lcd.setCursor(0,0);
lcd.print("LOW ");
lcd .print( pressureValue); //prints value from previous line to serial
lcd.print("Psig"); //prints label to serial
// delay(6000); //delay in milliseconds between read values
pressureValue2 = analogRead(pressureInput2); //reads value from input pin and assigns to variable
pressureValue2 = ((pressureValue2-pressureZero2)pressuretransducermaxPSI2)/(pressureMax2-pressureZero2); //conversion equation to convert analog reading to psi
lcd.setCursor(0,1);
lcd.print("HIGH "); //prints label to serial/
lcd .print( pressureValue2); //prints value from previous line to serial
lcd.print("Psig");

delay(600); //delay in milliseconds between read values

}
break;

case 3: {   //Design of page 3 
     Serial.print("C = "); 

Serial.println(thermocouple.readCelsius());
Serial.print("F = ");
Serial.println(thermocouple.readFahrenheit());

//lcd.clear();// clear previous values from screen
lcd.setCursor(1,0);// set cursor at character 0, line 0
lcd.print("");

  lcd.setCursor(0,1);// set cursor at character 0, line 1
  lcd.print(thermocouple.readCelsius()); 
  lcd.setCursor(5,1);// set cursor at character 9, line 1
  lcd.print((char)223); 
  lcd.setCursor(6,1);// set cursor at character 9, line 1
  lcd.print("C");    
              
  lcd.setCursor(7,1);// set cursor at character 9, line 1
  lcd.print(" ");       
  lcd.setCursor(8,1);// set cursor at character 9, line 1
  lcd.print(thermocouple.readFahrenheit()); // print temperature in ahrenheit
  lcd.setCursor(14,1);// set cursor at character 9, line 1      
  lcd.print((char)223); 
  lcd.setCursor(15,1);// set cursor at character 9, line 1
  lcd.print("F"); 

// Robojax.com MAX6675 video with LCD1602 20181124
delay(600);
}
break;
case 4: { //Design of page 3
int potValue = analogRead(controlPin);
int pwm =map(potValue, 0,1023, 0, 255);
if (thermocouple.readCelsius()<=10){
pwm = toPWM(35); }
else if (thermocouple.readCelsius()==10.2){
pwm = toPWM(36);
}
else if (thermocouple.readCelsius()==10.5){
pwm = toPWM(37);
}
else if (thermocouple.readCelsius()==10.7){
pwm = toPWM(38);
}
else if (thermocouple.readCelsius()==11){
pwm = toPWM(40);
}
else if (thermocouple.readCelsius()==11.3){
pwm = toPWM(41);
}
else if (thermocouple.readCelsius()==11.5){
pwm = toPWM(42);
}
else if (thermocouple.readCelsius()==11.7){
pwm = toPWM(43);
}
else if (thermocouple.readCelsius()==11.9){
pwm = toPWM(44);
}
else if (thermocouple.readCelsius()==12){
pwm = toPWM(45);
}
else if (thermocouple.readCelsius()==12.1){
pwm = toPWM(46);
}
else if (thermocouple.readCelsius()==12.3){
pwm = toPWM(47);
}
else if (thermocouple.readCelsius()==12.7){
pwm = toPWM(48);
}
else if (thermocouple.readCelsius()==12.6){
pwm = toPWM(49);
}
else if (thermocouple.readCelsius()==12.9){
pwm = toPWM(50);
}
else if (thermocouple.readCelsius()==13 ){
pwm = toPWM(51);
}
else if (thermocouple.readCelsius()==13.1 ){
pwm = toPWM(52);
}
else if (thermocouple.readCelsius()==13.3 ){
pwm = toPWM(53);
}
else if (thermocouple.readCelsius()==13.5 ){
pwm = toPWM(54);
}
else if (thermocouple.readCelsius()==13.7 ){
pwm = toPWM(55);
}
else if (thermocouple.readCelsius()==14.1 ){
pwm = toPWM(56);
}
else if (thermocouple.readCelsius()==14.3){
pwm = toPWM(57);
}

else if (thermocouple.readCelsius()==14.4 ){
pwm = toPWM(58);
}
else if (thermocouple.readCelsius()==14.7 ){
pwm = toPWM(59);
}
else if (thermocouple.readCelsius()==14.9 ){
pwm = toPWM(60);
}
else if (thermocouple.readCelsius()==15.1 ){
pwm = toPWM(61);
}
else if(thermocouple.readCelsius()==15.3){
pwm = toPWM(62);
}
else if (thermocouple.readCelsius()==15.5){
pwm = toPWM(63);
}
else if (thermocouple.readCelsius()==15.7 ){
pwm = toPWM(64);
}else if (thermocouple.readCelsius()==15.9 ){
pwm = toPWM(65);
}else if (thermocouple.readCelsius()==16.1 ){
pwm = toPWM(66);
}else if (thermocouple.readCelsius()==16.3 ){
pwm = toPWM(67);
}else if (thermocouple.readCelsius()==16.7 ){
pwm = toPWM(68);
}else if (thermocouple.readCelsius()==16.8 ){
pwm = toPWM(69);
}
else if (thermocouple.readCelsius()==17.1){
pwm = toPWM(70);
}else if (thermocouple.readCelsius()==17.3){
pwm = toPWM(71);
}else if (thermocouple.readCelsius()==17.7){
pwm = toPWM(72);
}else if (thermocouple.readCelsius()==17.9){
pwm = toPWM(73);
}else if (thermocouple.readCelsius()==17.6){
pwm = toPWM(74);
}
else if(thermocouple.readCelsius()==18.1){
pwm = toPWM(75);
} else if(thermocouple.readCelsius()==18.3){
pwm = toPWM(76);
} else if(thermocouple.readCelsius()==18.7){
pwm = toPWM(77);
} else if(thermocouple.readCelsius()==18.9){
pwm = toPWM(78);
} else if(thermocouple.readCelsius()==18.2){
pwm = toPWM(79);
}
else if (thermocouple.readCelsius()==19.1){
pwm = toPWM(80);
}else if (thermocouple.readCelsius()==19.3){
pwm = toPWM(81);
}else if (thermocouple.readCelsius()==19.7){
pwm = toPWM(82);
}else if (thermocouple.readCelsius()==19.9){
pwm = toPWM(85);
}else if (thermocouple.readCelsius()==19.8){
pwm = toPWM(88);
}
else if (thermocouple.readCelsius()==20){
pwm = toPWM(90);
}else if (thermocouple.readCelsius()==20.1){
pwm = toPWM(91);
}else if (thermocouple.readCelsius()==20.3){
pwm = toPWM(94);
}else if (thermocouple.readCelsius()==20.7){
pwm = toPWM(95);
}else if (thermocouple.readCelsius()==20.9){
pwm = toPWM(98);
}
else if (thermocouple.readCelsius()>=21){
pwm = toPWM(100);
}

analogWrite(pwmPin,pwm);
lcd.setCursor(1,0);
lcd.print("*** FUN PWM ***");
lcd.setCursor(7,1);
// lcd.print(pwm);
lcd.print(pwmToPercent(pwm));
lcd.print("%");
delay(600);
}
break;
case 5: {

if (voltage>=2) {digitalWrite(oilLosePin, HIGH);
Serial.println("oilLosePin NO");
lcd.print(voltage);
lcd.setCursor(0,0);
lcd.print("*** Oil Lose ");
lcd.setCursor(0,1);
lcd.print(" oilLosePin ON ");
delay(600);
} else {
digitalWrite(oilLosePin, LOW);
lcd.setCursor(0,0);
lcd.print(" Oil Lose *** ");
lcd.setCursor(0,1);
lcd.print(" oilLosePin OFF ");
Serial.println("oilLosePin OFF");} //Design of page 3
delay(1000);
}
break;
case 6: {if (thermocouple.readCelsius()<=15.9){
digitalWrite(oilHeaterPin, HIGH);
lcd.setCursor(0,0);
lcd.print("*** Oil Heater ");
lcd.setCursor(7,1);
lcd.print("ON ");
delay(500); } else {
digitalWrite(oilHeaterPin, LOW);
lcd.setCursor(0,0);
lcd.print(" Oil Heater *** ");
lcd.setCursor(7,1);
lcd.print("OFF");
}
}
break;
} //switch end
//-----------Auto scroll function---------------//
unsigned long currentMillis = millis(); //call current millis
// lcd.setCursor(0,1); // Show millis counter status
// Serial.println((currentMillis-previousMillis)/1000);

 if (currentMillis - previousMillis > interval) {  //If interval is reached, scroll page
 previousMillis = currentMillis;                   //replace previous millis with current millis as new start point
 lcd.clear();                                      //lcd clear if page is changed.
 if (page_counter <6){                             //Page counter never higher than 3 (total of pages)
 page_counter = page_counter +1;                   //Go to next page
 }
 else{
  page_counter=1;                                  //if counter higher than 3 (last page) return to page 1
 }
 }

if (digitalRead(8) == HIGH || digitalRead(10)==HIGH){ // Reset millis counter If any button is pressed
previousMillis = currentMillis;
}

}
int toPWM(int v){
return map(v, 0,100,0,255);
}// .
int pwmToPercent(int p)
{
return map(p, 0,255,0,100);
}

[Idahowalker]

Why not use code tags when posting your code?

What is the code supposed to do? What does it do instead?

[er_name_not_found]

Without code tags </>, it's pretty much unreadable, but I do see a lot of sizable delays.

[TomGeorge]

Hi, @jungbill
Welcome to the forum.

How to get the best out of this forum

See also FAQ - Arduino Forum for general rules on forum behaviour and etiquette. Hello, Welcome to the Arduino Forum. This guide explains how to get the best out of this forum. Please read and follow the instructions below. Being new here you might think this is having rules for the sake of rules, but that is not the case. If you don’t follow the guidelines all that happens is there is a long exchange of posts while we try to get you to tell us what we need in order to help you, which is fru…

Please explain what it is supposed to do?
Please explain what it is doing?

Tom...

[alto777]

@jungbill

else if (thermocouple.readCelsius()==15.5){
pwm = toPWM(63);

Maybe you've solved your problem (?) but this way of setting pwm from the thermocouple is not great.

Can it ever be 15.4 or 15.6? You set no value.

Will it be exactly 15.5? On,y then do you set a value.

Might there be a simple mathematical relationship being the value read form the thermocouple and the desired pwm setting? Looks like maybe - if so, your code could be a bit shorter.

Just wondering.

a7

[alto777]

@jungbill

else if (thermocouple.readCelsius()==12.7){
pwm = toPWM(48);
}
else if (thermocouple.readCelsius()==12.6){
pwm = toPWM(49);
}
else if (thermocouple.readCelsius()==12.9){
pwm = toPWM(50);
}

and doing it mathematics style might help you not make what seem to be obvious if ultimately unimportant errors.

a7

[JohnRob]

Without knowing what isn't working I would suggest you:

Remove all code except Analog measurement and display.
Make a program that will measure analog and display every x seconds.

When that is working add in the remainder little at a time.

John

[jungbill]

First of all, thank you for your response, I am a beginner, please help me. If yes, it is not a big problem, my problem is that when the program is running, the program will stop running when there is voltage input to A5 Pin, there is no problem if case 5 is run alone with the same electrical circuit, please help to solve this problem, thank you.
Bill

[JohnRob]

You will need to post your code using the </> function. Before doing that please use the TOOLS/Auto Format command in the IDE editor. This will change the text to a "standard" form.

[jungbill]

First of all, thank you for your response, I am a beginner, please help me. If yes, it is not a big problem, my problem is that when the program is running, the program will stop running when there is voltage input to A5 Pin, there is no problem if case 5 is run alone with the same electrical circuit, please help to solve this problem, thank you.

[6v6gt]

@jungbill

. . . my problem is that when the program is running, the program will stop running when there is voltage input to A5 Pin, there is no problem if case 5 is run alone with the same electrical circuit, please help to solve this problem, thank you.

Here it is in code tags.
Some of your '*' symbols have been treated automatically as formatting characters and replaced with bold text.

Case 5 looks harmless and should do something anyway whatever the voltage is (between 0 and 5 volts).

If a program "stops" look for divide by zero errors, or the program getting in a tight loop without any obvious external activity. or arrays going out of bounds (probably not a problem here).

Some ideas (apart from what you've been told aiready):

• switch on compiler warnings (you've some unused variables and maybe other problems)
• blink a led in the loop() so you can see if is running.
• handle the case where page_counter is out of range.
• don't do this: const int pressureMax = 921.6; // that is a float
• it is best to do this with long literals: long Time_hour_setting = 3600000UL; UL : unsigned long

#include "max6675.h"// this file is part of the library. See video for details
#include <LCD_I2C.h>
#include <Wire.h>
#define pwmPin 9
#define controlPin A3
const int SW = 2; //pin2並電阻10K在按鈕同側對側電容1n接G the number of the pushbutton pin
const int compin = 3;
const int timeupin = 12;
const int oilLosePin = 7;
const int oilHeaterPin = 11;
const int refVolts = 5; //使用 5V 參考電壓的 Arduino 開發板
//int oilLosePin=7; //LED 連接數位接腳 7
int val; //數位值
float volts;
//const int oilLoseVol = 7;
const unsigned long Debounce = 20;
const unsigned long LongPress = 800;
unsigned long ButtonStateChangeTime = 0; // Debounce timer
boolean ButtonWasPressed = false;
boolean Effect = false;
boolean EffectState = false;
//unsigned long oilsensorValue=0;
int Time_second;
int Time_minute;
int Time_hour;
const int baudRate = 9600;
long Time_hour_setting = 3600000;
long Time_minute_setting = 60000;
long Time_second_setting = 1000;
LCD_I2C lcd(0x27, 16, 2);
unsigned long start_time;
int page_counter = 1 ; //To move beetwen pages
unsigned long previousMillis = 0;
unsigned long interval = 5000; //Desired wait time 10 seconds
int up = 8; //Up button
int down = 10; //Down button
//---------Storage debounce function-----//

boolean current_up = LOW;
boolean last_up = LOW;
boolean last_down = LOW;
boolean current_down = LOW;
const int pressureInput = A0; //select the analog input pin for the pressure transducer
const int pressureZero = 160; //analog reading of pressure transducer at 0psi
const int pressureMax = 921.6; //analog reading of pressure transducer at 100psi
const int pressuretransducermaxPSI = 174; //psi value of transducer being used
const int pressureInput2 = A1; //select the analog input pin for the pressure transducer
const int pressureZero2 = 102.4; //analog reading of pressure transducer at 0psi
const int pressureMax2 = 921.6; //analog reading of pressure transducer at 100psi
const int pressuretransducermaxPSI2 = 435; //psi value of transducer being used
//const int baudRate = 9600; //constant integer to set the baud rate for serial monitor
const int sensorreadDelay = 250; //constant integer to set the sensor read delay in milliseconds
float pressureValue = 0; //variable to store the value coming from the pressure transducer
float pressureValue2 = 0;
int soPin = 6;// SO=Serial Out
int csPin = 5;// CS = chip select CS pin
int sckPin = 4;// SCK = Serial Clock pin
MAX6675 thermocouple(sckPin, csPin, soPin); //PIN4.5.6
void setup() {
  pinMode(SW, INPUT);//PIN2
  pinMode(compin, OUTPUT); //PIN3
  pinMode(timeupin, INPUT_PULLUP); //PIN12
  pinMode(pwmPin, OUTPUT); //PIN9
  pinMode(oilLosePin , OUTPUT); //PIN7
  pinMode(oilHeaterPin, OUTPUT); //PIN11
  //pinMode(oilLoseVol,INPUT); //PIN7
  int timeupin = 0;
  //float voltage = 0;//int oilLosePin =0;
  lcd.begin();
  lcd.backlight();
  lcd.print("GOOD LUCK"); //|
  lcd.setCursor(0, 1); //|
  lcd.print(" Jung Bill ");
  delay( 6000);
  digitalWrite(SW, HIGH);
  Serial.println("Start");
  digitalWrite(compin, LOW);
  Serial.begin(baudRate);
  digitalWrite(oilLosePin, LOW);
  digitalWrite(oilHeaterPin, LOW);

}
//---- De-bouncing function for all buttons----//
boolean debounce(boolean last, int pin)
{
  boolean current = digitalRead(pin);
  if (last != current)
  {
    delay(5);
    current = digitalRead(pin);
  }
  return current;

}

void loop() {
  int sensorValue = analogRead(A5);
  // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):
  float voltage = sensorValue * (5.0 / 1023.0);
  // print out the value you read:
  Serial.println(voltage);
  unsigned long currentTime = millis();
  boolean buttonIsPressed = digitalRead(SW) == LOW; // Active LOW
  // Check for button state change debounce.
  if (buttonIsPressed != ButtonWasPressed &&
      currentTime - ButtonStateChangeTime > Debounce) {
    // Button state has changed.
    ButtonWasPressed = buttonIsPressed;

    if (ButtonWasPressed) {
      Serial.println("Press");
      // digitalWrite(compin, HIGH);
      //delay(1);
      // digitalWrite(compin, LOW);
    }

    else {

      //Released after 500ms has passed:
      if (currentTime - ButtonStateChangeTime >= LongPress) {
        Serial.println("Momentary");
        //  digitalWrite (LED, LOW);
      }

      if (currentTime - ButtonStateChangeTime < LongPress && Effect == false) {
        Serial.println("Start Recycling");
        Effect = true;

        digitalWrite(compin, HIGH);

      }
      else {
        if (Effect == true) {
          Serial.println("Recycling End");
          Effect = false;
          digitalWrite(compin, LOW);
        }
      }
    }



    //Time reset.
    ButtonStateChangeTime = currentTime;
  }
  current_up = debounce(last_up, up); //Debounce for Up button
  current_down = debounce(last_down, down); //Debounce for Down button

  //Page Up
  if (last_up == LOW && current_up == HIGH) {
    lcd.clear(); //When page is changed, lcd clear to print new page
    if (page_counter < 6) { //Page counter never higher than 3(total of pages)
      page_counter = page_counter + 1; //Page up
      //delay(500);
    }
    else {
      page_counter = 1; //return to page 1
    }
  }

  last_up = current_up;

  //Page Down
  if (last_down == LOW && current_down == HIGH) {
    lcd.clear(); //When page is changed, lcd clear to print new page
    if (page_counter > 1) { //Page counter never lower than 1 (total of pages)
      page_counter = page_counter - 1; //Page down
      // delay(500);
    }
    else {
      page_counter = 6; //return to page 3
    }
  }

  last_down = current_down;

  //------ Switch function to write and show what you want---//

  switch (page_counter) {

    case 1: {    //Design of home page 1
        int timeup = digitalRead(12);
        if (timeup == HIGH) {

          start_time = currentTime ;
          // start_time=millis();
          Time_hour = start_time / Time_hour_setting; //小時

          Time_minute = (start_time % Time_hour_setting) / Time_minute_setting; //分鐘

          Time_second = ((start_time % Time_hour_setting) % Time_minute_setting) / Time_second_setting; //秒
          // put your main code here, to run repeatedly:
          lcd.setCursor(0, 0);
          lcd.print("Recycling TIME");
          lcd.setCursor(3, 1);
          lcd.print(Time_hour);
          lcd.print("Hr ");
          lcd.print(Time_minute);
          lcd.print("Min");
          lcd.print(Time_second);
          lcd.print("Sec");
          delay(600);
        }
      }
      break;
    case 2: { //Design of page 2
        pressureValue = analogRead(pressureInput); //reads value from input pin and assigns to variable
        pressureValue = ((pressureValue - pressureZero) * pressuretransducermaxPSI) / (pressureMax - pressureZero); //conversion equation to convert analog reading to psi
        lcd.setCursor(0, 0);
        lcd.print("LOW ");
        lcd .print( pressureValue); //prints value from previous line to serial
        lcd.print("Psig"); //prints label to serial
        // delay(6000); //delay in milliseconds between read values
        pressureValue2 = analogRead(pressureInput2); //reads value from input pin and assigns to variable
        pressureValue2 = ((pressureValue2 - pressureZero2)pressuretransducermaxPSI2) / (pressureMax2 - pressureZero2); //conversion equation to convert analog reading to psi
        lcd.setCursor(0, 1);
        lcd.print("HIGH "); //prints label to serial/
        lcd .print( pressureValue2); //prints value from previous line to serial
        lcd.print("Psig");

        delay(600); //delay in milliseconds between read values

      }
      break;

    case 3: {   //Design of page 3
        Serial.print("C = ");

        Serial.println(thermocouple.readCelsius());
        Serial.print("F = ");
        Serial.println(thermocouple.readFahrenheit());

        //lcd.clear();// clear previous values from screen
        lcd.setCursor(1, 0); // set cursor at character 0, line 0
        lcd.print("");

        lcd.setCursor(0, 1); // set cursor at character 0, line 1
        lcd.print(thermocouple.readCelsius());
        lcd.setCursor(5, 1); // set cursor at character 9, line 1
        lcd.print((char)223);
        lcd.setCursor(6, 1); // set cursor at character 9, line 1
        lcd.print("C");

        lcd.setCursor(7, 1); // set cursor at character 9, line 1
        lcd.print(" ");
        lcd.setCursor(8, 1); // set cursor at character 9, line 1
        lcd.print(thermocouple.readFahrenheit()); // print temperature in ahrenheit
        lcd.setCursor(14, 1); // set cursor at character 9, line 1
        lcd.print((char)223);
        lcd.setCursor(15, 1); // set cursor at character 9, line 1
        lcd.print("F");

        // Robojax.com MAX6675 video with LCD1602 20181124
        delay(600);
      }
      break;
    case 4: { //Design of page 3
        int potValue = analogRead(controlPin);
        int pwm = map(potValue, 0, 1023, 0, 255);
        if (thermocouple.readCelsius() <= 10) {
          pwm = toPWM(35);
        }
        else if (thermocouple.readCelsius() == 10.2) {
          pwm = toPWM(36);
        }
        else if (thermocouple.readCelsius() == 10.5) {
          pwm = toPWM(37);
        }
        else if (thermocouple.readCelsius() == 10.7) {
          pwm = toPWM(38);
        }
        else if (thermocouple.readCelsius() == 11) {
          pwm = toPWM(40);
        }
        else if (thermocouple.readCelsius() == 11.3) {
          pwm = toPWM(41);
        }
        else if (thermocouple.readCelsius() == 11.5) {
          pwm = toPWM(42);
        }
        else if (thermocouple.readCelsius() == 11.7) {
          pwm = toPWM(43);
        }
        else if (thermocouple.readCelsius() == 11.9) {
          pwm = toPWM(44);
        }
        else if (thermocouple.readCelsius() == 12) {
          pwm = toPWM(45);
        }
        else if (thermocouple.readCelsius() == 12.1) {
          pwm = toPWM(46);
        }
        else if (thermocouple.readCelsius() == 12.3) {
          pwm = toPWM(47);
        }
        else if (thermocouple.readCelsius() == 12.7) {
          pwm = toPWM(48);
        }
        else if (thermocouple.readCelsius() == 12.6) {
          pwm = toPWM(49);
        }
        else if (thermocouple.readCelsius() == 12.9) {
          pwm = toPWM(50);
        }
        else if (thermocouple.readCelsius() == 13 ) {
          pwm = toPWM(51);
        }
        else if (thermocouple.readCelsius() == 13.1 ) {
          pwm = toPWM(52);
        }
        else if (thermocouple.readCelsius() == 13.3 ) {
          pwm = toPWM(53);
        }
        else if (thermocouple.readCelsius() == 13.5 ) {
          pwm = toPWM(54);
        }
        else if (thermocouple.readCelsius() == 13.7 ) {
          pwm = toPWM(55);
        }
        else if (thermocouple.readCelsius() == 14.1 ) {
          pwm = toPWM(56);
        }
        else if (thermocouple.readCelsius() == 14.3) {
          pwm = toPWM(57);
        }

        else if (thermocouple.readCelsius() == 14.4 ) {
          pwm = toPWM(58);
        }
        else if (thermocouple.readCelsius() == 14.7 ) {
          pwm = toPWM(59);
        }
        else if (thermocouple.readCelsius() == 14.9 ) {
          pwm = toPWM(60);
        }
        else if (thermocouple.readCelsius() == 15.1 ) {
          pwm = toPWM(61);
        }
        else if (thermocouple.readCelsius() == 15.3) {
          pwm = toPWM(62);
        }
        else if (thermocouple.readCelsius() == 15.5) {
          pwm = toPWM(63);
        }
        else if (thermocouple.readCelsius() == 15.7 ) {
          pwm = toPWM(64);
        } else if (thermocouple.readCelsius() == 15.9 ) {
          pwm = toPWM(65);
        } else if (thermocouple.readCelsius() == 16.1 ) {
          pwm = toPWM(66);
        } else if (thermocouple.readCelsius() == 16.3 ) {
          pwm = toPWM(67);
        } else if (thermocouple.readCelsius() == 16.7 ) {
          pwm = toPWM(68);
        } else if (thermocouple.readCelsius() == 16.8 ) {
          pwm = toPWM(69);
        }
        else if (thermocouple.readCelsius() == 17.1) {
          pwm = toPWM(70);
        } else if (thermocouple.readCelsius() == 17.3) {
          pwm = toPWM(71);
        } else if (thermocouple.readCelsius() == 17.7) {
          pwm = toPWM(72);
        } else if (thermocouple.readCelsius() == 17.9) {
          pwm = toPWM(73);
        } else if (thermocouple.readCelsius() == 17.6) {
          pwm = toPWM(74);
        }
        else if (thermocouple.readCelsius() == 18.1) {
          pwm = toPWM(75);
        } else if (thermocouple.readCelsius() == 18.3) {
          pwm = toPWM(76);
        } else if (thermocouple.readCelsius() == 18.7) {
          pwm = toPWM(77);
        } else if (thermocouple.readCelsius() == 18.9) {
          pwm = toPWM(78);
        } else if (thermocouple.readCelsius() == 18.2) {
          pwm = toPWM(79);
        }
        else if (thermocouple.readCelsius() == 19.1) {
          pwm = toPWM(80);
        } else if (thermocouple.readCelsius() == 19.3) {
          pwm = toPWM(81);
        } else if (thermocouple.readCelsius() == 19.7) {
          pwm = toPWM(82);
        } else if (thermocouple.readCelsius() == 19.9) {
          pwm = toPWM(85);
        } else if (thermocouple.readCelsius() == 19.8) {
          pwm = toPWM(88);
        }
        else if (thermocouple.readCelsius() == 20) {
          pwm = toPWM(90);
        } else if (thermocouple.readCelsius() == 20.1) {
          pwm = toPWM(91);
        } else if (thermocouple.readCelsius() == 20.3) {
          pwm = toPWM(94);
        } else if (thermocouple.readCelsius() == 20.7) {
          pwm = toPWM(95);
        } else if (thermocouple.readCelsius() == 20.9) {
          pwm = toPWM(98);
        }
        else if (thermocouple.readCelsius() >= 21) {
          pwm = toPWM(100);
        }

        analogWrite(pwmPin, pwm);
        lcd.setCursor(1, 0);
        lcd.print("*** FUN PWM ***");
        lcd.setCursor(7, 1);
        // lcd.print(pwm);
        lcd.print(pwmToPercent(pwm));
        lcd.print("%");
        delay(600);
      }
      break;


    case 5: {

        if (voltage >= 2) {
          digitalWrite(oilLosePin, HIGH);
          Serial.println("oilLosePin NO");
          lcd.print(voltage);
          lcd.setCursor(0, 0);
          lcd.print("*** Oil Lose ");
          lcd.setCursor(0, 1);
          lcd.print(" oilLosePin ON ");
          delay(600);
        } else {
          digitalWrite(oilLosePin, LOW);
          lcd.setCursor(0, 0);
          lcd.print(" Oil Lose *** ");
          lcd.setCursor(0, 1);
          lcd.print(" oilLosePin OFF ");
          Serial.println("oilLosePin OFF");
        } //Design of page 3
        delay(1000);
      }
      break;
    case 6: {
        if (thermocouple.readCelsius() <= 15.9) {
          digitalWrite(oilHeaterPin, HIGH);
          lcd.setCursor(0, 0);
          lcd.print("*** Oil Heater ");
          lcd.setCursor(7, 1);
          lcd.print("ON ");
          delay(500);
        } else {
          digitalWrite(oilHeaterPin, LOW);
          lcd.setCursor(0, 0);
          lcd.print(" Oil Heater *** ");
          lcd.setCursor(7, 1);
          lcd.print("OFF");
        }
      }
      break;
  } //switch end
  //-----------Auto scroll function---------------//
  unsigned long currentMillis = millis(); //call current millis
  // lcd.setCursor(0,1); // Show millis counter status
  // Serial.println((currentMillis-previousMillis)/1000);

  if (currentMillis - previousMillis > interval) {  //If interval is reached, scroll page
    previousMillis = currentMillis;                   //replace previous millis with current millis as new start point
    lcd.clear();                                      //lcd clear if page is changed.
    if (page_counter < 6) {                           //Page counter never higher than 3 (total of pages)
      page_counter = page_counter + 1;                  //Go to next page
    }
    else {
      page_counter = 1;                                //if counter higher than 3 (last page) return to page 1
    }
  }

  if (digitalRead(8) == HIGH || digitalRead(10) == HIGH) { // Reset millis counter If any button is pressed
    previousMillis = currentMillis;
  }

}
int toPWM(int v) {
  return map(v, 0, 100, 0, 255);
}// .
int pwmToPercent(int p)
{
  return map(p, 0, 255, 0, 100);
}

[J-M-L]

why is the first post still not corrected / edited to add the code tags.

➜ please tidy that up and edit your post, select the code part and press the </> icon in the tool bar to mark it as code. It's barely readable as it stands. (also make sure you indented the code in the IDE before copying, that's done by pressing ctrlT on a PC or cmdT on a Mac)