/*
This programme uses the 85 degree low temperature curing cycle to programme the Atmega32U4 chip on the carbon ply carbon fibre curing oven.
*/

#include <Arduino.h>
#include <U8g2lib.h>

#ifdef U8X8_HAVE_HW_SPI
#include <SPI.h>
#endif
#ifdef U8X8_HAVE_HW_I2C
#include <Wire.h>
#endif

//constructor for the OLED screen
U8G2_SSD1306_128X64_NONAME_1_HW_I2C u8g2(U8G2_R0, U8X8_PIN_NONE, 3, 2);

//defining the constant variables for the pins
const int relayPin = 12;
const int powerledPin = 13;
const int heaterledPin = 5;
const int programmedledPin = 10;
const int modebuttonPin = A5;
const int downbuttonPin = A4;
const int upbuttonPin = A3;
const int ThermistorPin = A1;

//turning on the power LED and programmed LED
int powerled = HIGH ;
int heaterled = LOW;
int programmedled = HIGH;
int timeMins = 0;             //current time in minutes
int timeLeft = 900;           //amount of time left in programme. 

//set initial target temperature
int setTemp = 0;              //may need to be float in some programmes?

//set initial variables used to calculate temperature
int Vo;
float R1 = 10000;
float logR2, R2, T;
float c1 = 1.009249522e-03, c2 = 2.378405444e-04, c3 = 2.019202697e-07;
float powervoltage=5;//define the power supply voltage.

//SETUP
void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);

  //Define pins to be used as output
  pinMode(relayPin,OUTPUT);
  pinMode(powerledPin,OUTPUT);
  pinMode(heaterledPin,OUTPUT);
  pinMode(programmedledPin,OUTPUT);

  //Define pins to be used as input
   pinMode(modebuttonPin,INPUT);
   pinMode(downbuttonPin,INPUT);
   pinMode(upbuttonPin,INPUT);
   pinMode(ThermistorPin, INPUT);

   //initialise the u8g2 OLED screen
  u8g2.begin();  
  //allow printing of variables on the screen
  u8g2.enableUTF8Print();
}

// the loop routine runs over and over again forever:
void loop() {
  
    
  digitalWrite(powerledPin,HIGH);
  digitalWrite(programmedledPin,HIGH);
  
  Vo = analogRead(ThermistorPin);
  R2 = R1 * (1023.0 / (float)Vo - 1.0);
  logR2 = log(R2);
  T = (1.0 / (c1 + c2*logR2 + c3*logR2*logR2*logR2));
  T = T - 273.15;
  //T=45;      //Just used for debugging

  Serial.print("Temperature: "); 
  Serial.println(T);
  
    timeMins = millis()/1000/60;
    setTemp = 30;
    
    //enter first ramp up to 70degC at 1deg/min increments
    while (setTemp < 70){
      setTemp = setTemp+1;
      timeLeft=900-setTemp;
      Serial.println(setTemp);
      int counter = 1;
      
      //begin thermostatic loop with 1.2 second cycle
      while (counter <= 50){
          if(T<setTemp){
            digitalWrite(relayPin,HIGH);
            digitalWrite(heaterledPin,HIGH);
          }
          else {
           digitalWrite(relayPin,LOW);    
           digitalWrite(heaterledPin,LOW);
          }
    
          //display current and set temperatures
          u8g2.firstPage();
          do {
              u8g2.setFont(u8g2_font_ncenB10_tr);
              u8g2.drawStr(0,20,"Current: ");
              u8g2.setCursor(70, 20);
              u8g2.print(T,1);
              u8g2.drawStr(100,20,"'C");
              u8g2.drawStr(0,40,"Target: ");
              u8g2.setCursor(70, 40);
              u8g2.print(setTemp);
              u8g2.drawStr(100,40,"'C");
              u8g2.drawStr(0,60,"Remain:");
              u8g2.setCursor(70, 60);
              u8g2.print(timeLeft);
              u8g2.drawStr(100,60,"mins");
            } while (u8g2.nextPage());
            delay(1200);
            counter=counter + 1;
      }
    }

 //hold at 70 degrees until 4h50mins
    while (timeMins < 290){
      setTemp = 70;
      timeMins = millis()/1000/60;
      Serial.println(setTemp);
      int counter = 1;
      
      //begin thermostatic loop with 1.2 second cycle
      while (counter <= 50){
          if(T<setTemp){
            digitalWrite(relayPin,HIGH);
            digitalWrite(heaterledPin,HIGH);
          }
          else {
           digitalWrite(relayPin,LOW);    
           digitalWrite(heaterledPin,LOW);
          }
    
          //display current and set temperatures
          u8g2.firstPage();
           do {
              u8g2.setFont(u8g2_font_ncenB10_tr);
              u8g2.drawStr(0,20,"Current: ");
              u8g2.setCursor(70, 20);
              u8g2.print(T,1);
              u8g2.drawStr(100,20,"'C");
              u8g2.drawStr(0,40,"Target: ");
              u8g2.setCursor(70, 40);
              u8g2.print(setTemp);
              u8g2.drawStr(100,40,"'C");
              u8g2.drawStr(0,60,"Remain:");
              u8g2.setCursor(70, 60);
              u8g2.print(timeLeft);
              u8g2.drawStr(100,60,"mins");
            } while (u8g2.nextPage());
            delay(1200);
            counter=counter + 1;
      }
    }

     //ramp up to 85degC until 4h58
     while (timeMins < 298){
      setTemp = setTemp+(2/12);
      timeMins = millis()/1000/60;
      Serial.println(setTemp);
      int counter = 1;
      
      //begin thermostatic loop with 1.2 second cycle
      while (counter <= 50){
          if(T<setTemp){
            digitalWrite(relayPin,HIGH);
            digitalWrite(heaterledPin,HIGH);
          }
          else {
           digitalWrite(relayPin,LOW);    
           digitalWrite(heaterledPin,LOW);
          }
    
          //display current and set temperatures
          u8g2.firstPage();
         do {
              u8g2.setFont(u8g2_font_ncenB10_tr);
              u8g2.drawStr(0,20,"Current: ");
              u8g2.setCursor(70, 20);
              u8g2.print(T,1);
              u8g2.drawStr(100,20,"'C");
              u8g2.drawStr(0,40,"Target: ");
              u8g2.setCursor(70, 40);
              u8g2.print(setTemp);
              u8g2.drawStr(100,40,"'C");
              u8g2.drawStr(0,60,"Remain:");
              u8g2.setCursor(70, 60);
              u8g2.print(timeLeft);
              u8g2.drawStr(100,60,"mins");
            } while (u8g2.nextPage());
            delay(1200);
            counter=counter + 1;
      }
    }

  //hold at 85 degrees until 14h15mins
    while (timeMins < 855){
      setTemp = 85;
      timeMins = millis()/1000/60;
      Serial.println(setTemp);
      int counter = 1;
      
      //begin thermostatic loop with 1.2 second cycle
      while (counter <= 50){
          if(T<setTemp){
            digitalWrite(relayPin,HIGH);
            digitalWrite(heaterledPin,HIGH);
          }
          else {
           digitalWrite(relayPin,LOW);    
           digitalWrite(heaterledPin,LOW);
          }
    
          //display current and set temperatures
          u8g2.firstPage();
        do {
              u8g2.setFont(u8g2_font_ncenB10_tr);
              u8g2.drawStr(0,20,"Current: ");
              u8g2.setCursor(70, 20);
              u8g2.print(T,1);
              u8g2.drawStr(100,20,"'C");
              u8g2.drawStr(0,40,"Target: ");
              u8g2.setCursor(70, 40);
              u8g2.print(setTemp);
              u8g2.drawStr(100,40,"'C");
              u8g2.drawStr(0,60,"Remain:");
              u8g2.setCursor(70, 60);
              u8g2.print(timeLeft);
              u8g2.drawStr(100,60,"mins");
            } while (u8g2.nextPage());
            delay(1200);
            counter=counter + 1;
      }
    }

   //natural cool until 15 hours
    while (timeMins < 900){
      setTemp = 0;
      delay(60000);
      timeMins = millis()/1000/60;
    }
    setTemp = 0;
}