//initializes/defines the output pin of the LM34 temperature sensor
int outputpin= 0;
//this sets the ground pin to LOW and the input voltage pin to high
#include <EEPROM.h>
#include <Wire.h>
// pin A4 is SDA, pin A5 is SCL
#include "LiquidCrystal_I2C.h"
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);  // Set the LCD I2C address
float fahrenheit = 0; 
int sensor_H = 0;
int sensor_L = 254;
int Previous_H = 0;
int Previous_L = 254;
int t_Previous = 0;
unsigned long prev_day_millis = 0;
unsigned long sample_Period = 1800000; //86400000 millis per day,3600000 per hour
int counter =0;
int days=0;
int addr = 0;

void setup()
{
//Serial.begin(9600);
//-------- Write characters on the display ------------------
// NOTE: Cursor Position: (CHAR, LINE) start at 0 
pinMode(A1,INPUT_PULLUP);
pinMode(A2,INPUT_PULLUP);
lcd.begin(16,2); 
lcd.backlight();
lcd.setCursor(0,0); //Start at character 4 on line 0
lcd.print("water temp V1");
delay(1000);
lcd.setCursor(0,0);
lcd.print("             ");
float fahrenheit = ReadSens_and_Condition();
sensor_H = fahrenheit;
sensor_L = fahrenheit;
Previous_H = fahrenheit;
Previous_L = fahrenheit;
t_Previous = fahrenheit;
}

float ReadSens_and_Condition(){
  int i;
  int rawvoltage = 0;
  for (i = 0; i < 5; i++){
    rawvoltage = rawvoltage + analogRead(outputpin);    // sensor on analog pin 0
  }
  rawvoltage = rawvoltage / 5;    // average
  float millivolts= (rawvoltage/1024.0) * 3300;  //rawvoltage/1024.0) * 5000;
  float fahrenheit= millivolts/10;
  return fahrenheit;
}

void loop()
{
read_button_A1(); // button clears EEPROM highs and lows, starts over

float fahrenheit = ReadSens_and_Condition();

if (fahrenheit > sensor_H){
  sensor_H = fahrenheit;
}
if (fahrenheit <= sensor_L){
  sensor_L = fahrenheit;
}

is_Time_To_Store(); // if yes, store daily his and lows in EEPROM and reset daily values

lcd_display(fahrenheit); // line 1 of display

lcd_min_max_daily();     // line 2 of display (daily min and max)

t_Previous=fahrenheit; // used for daily display formatting
Previous_H = sensor_H;
Previous_L = sensor_L;



if(digitalRead(A2)==LOW){
lcd_weekly_min_max();  // if so, display weekly min and max
}
} // end loop

void lcd_display(float fahrenheit){  // current temperature (line 1)
lcd.setCursor(0,0);
lcd.print(counter);
if (fahrenheit != t_Previous){
lcd.setCursor(5,0);
lcd.print("     ");     // clear previous
}
lcd.setCursor(5,0); 
lcd.print(fahrenheit,1);
if(fahrenheit < 100){
lcd.setCursor(10,0); // Start at character 10 on line 0
lcd.print("F "); // 
}
else{
lcd.print(" F");  
}
}

void lcd_min_max_daily(){ // daily min max (line 2)
if(Previous_L != sensor_L){ //erase if different
lcd.setCursor(0,1);
lcd.print("   "); 
}    
lcd.setCursor(0,1); 
lcd.print(sensor_L); 
if(sensor_L < 100){
lcd.setCursor(3,1); 
lcd.print("MIN ");
}
else{
lcd.print(" MIN");  
}
if(Previous_H != sensor_H){ 
lcd.setCursor(10,1);
lcd.print("  "); 
}
if(sensor_H < 100){    
lcd.setCursor(10,1);
lcd.print(sensor_H);
}
else{
lcd.setCursor(9,1);
lcd.print(sensor_H);
}
lcd.setCursor(13,1);
lcd.print("MAX");  
delay(100);
}

void lcd_weekly_min_max(){
for(int i=0; i<7; i++){
int days=i+1;
int value1 = EEPROM.read(2*i);
int value2 = EEPROM.read(2*i+1);
lcd_weekly(days,value1,value2);
}
}

void lcd_weekly(int d, int a, int b){
lcd.clear();
lcd.setCursor(8,0); 
lcd.print(d);
lcd.setCursor(0,1);
lcd.print("    ");
lcd.setCursor(0,1);
lcd.print(a);  
lcd.setCursor(4,1);
lcd.print("MIN");

lcd.setCursor(8,1);
lcd.print("     ");
lcd.setCursor(9,1);
lcd.print(b);
lcd.setCursor(13,1);
lcd.print("MAX");

delay(2000);
}

void is_Time_To_Store(){
if((millis()-prev_day_millis)>sample_Period){
 counter++;
  switch(counter){
    case 1:
   EEPROM.write(addr, sensor_L);
   addr++;
   EEPROM.write(addr, sensor_H);
    addr++; 
    reset_L_H();
    break;
   case 2:
   EEPROM.write(addr, sensor_L);
   addr++;
   EEPROM.write(addr, sensor_H);
   addr++; 
   reset_L_H();
   break;
   case 3:
   EEPROM.write(addr, sensor_L);
   addr++;
   EEPROM.write(addr, sensor_H);
   addr++; 
   reset_L_H();
   break;
   case 4:
   EEPROM.write(addr, sensor_L);
   addr++;
   EEPROM.write(addr, sensor_H);
   addr++; 
   reset_L_H();
   break;
   case 5:
   EEPROM.write(addr, sensor_L);
   addr++;
   EEPROM.write(addr, sensor_H);
   addr++; 
   reset_L_H();
   break;
   case 6:
   EEPROM.write(addr, sensor_L);
   addr++;
   EEPROM.write(addr, sensor_H);
   addr++; 
   reset_L_H();
   break;
   case 7:
   EEPROM.write(addr, sensor_L);
   addr++;
   EEPROM.write(addr, sensor_H);
   addr++; 
   reset_L_H();
   break;
   
   default:
   prev_day_millis=millis(); // reset for another day
   break;
}
}
}
void reset_L_H(){
   lcd.clear();
  float fahrenheit = ReadSens_and_Condition();
 sensor_H = fahrenheit;
 Previous_H = fahrenheit; // reset highs and lows for today
 sensor_L = fahrenheit;
 Previous_L = fahrenheit;
 prev_day_millis=millis(); // reset for another day
}
void read_button_A1(){
if(digitalRead(A1)==LOW){ // if so, reset EEPROM min max to zeros
for(int i=0; i<14; i++){
EEPROM.write(i,0);
}
delay(300);
counter=0;  // restart for new readings
days=0;
addr=0;
lcd.clear();
prev_day_millis=millis(); // reset for new readings
}
}