#include <LiquidCrystal_I2C.h>              // LiquidCrystal I2C - Version: 1.1.1
#include <HX711_ADC.h>                      // https://github.com/olkal/HX711_ADC
#include <Wire.h>
#include <LiquidCrystal_I2C.h>              // LiquidCrystal_I2C library
HX711_ADC LoadCell(4, 5);                   // dt pin, sck pin
LiquidCrystal_I2C lcd(0x27, 16, 2);         // LCD HEX address 0x27
int taree = 6;
int a = 0;
float b = 0;

int rele1 = 8;
int rele2 = 7;
int vaha = 1000;                            // hranice vahy pro retrakci (g)


void setup() {
  pinMode (taree, INPUT_PULLUP);
  LoadCell.begin();                         // zahaji komunikaci s HX711
  LoadCell.start(1000);                     // snímače zatížení mají 1000 ms času na stabilizaci a vynulování

  /////////////////////////////////////
  LoadCell.setCalFactor(0.42);               // Calibarate your LOAD CELL with 100g weight, and change the value according to readings
  /////////////////////////////////////
  
  //lcd.begin();                            // begins connection to the LCD module
  lcd.init();                               // initialize the lcd 
  lcd.backlight();                          // turns on the backlight
  lcd.setCursor(1, 0);                      // set cursor to first row
  lcd.print("Digital Scale ");              // print out to LCD
  lcd.setCursor(0, 1);                      // set cursor to first row
  lcd.print(" 5KG MAX LOAD ");              // print out to LCD
  delay(3000);
  lcd.clear();

  pinMode (rele1, OUTPUT);
  pinMode (rele2, OUTPUT);
  digitalWrite(rele1, LOW);
  digitalWrite(rele2, LOW);
}


void loop() { 
  lcd.setCursor(1, 0);                        // set cursor to first row
  lcd.print("Digital Scale ");                // print out to LCD 
  LoadCell.update();                          // nacte data z vahy
  float i = LoadCell.getData();               // get output value
  
 if (i<0)
 {
  i = i * (-1);
  lcd.setCursor(0, 1);
  lcd.print("-");
  lcd.setCursor(8, 1);
  lcd.print("-");
 }
 else
 {
  lcd.setCursor(0, 1);
  lcd.print(" ");
  lcd.setCursor(8, 1);
  lcd.print(" ");
 }
  
  lcd.setCursor(1, 1);                          // set cursor to secon row
  lcd.print(i, 1);                              // vytiskněte načtenou hodnotu do druhého řádku
  lcd.print("g ");
  float z = i/28.3495;
  lcd.setCursor(9, 1);
  lcd.print(z, 2);
  lcd.print("oz ");

 if (i<vaha)
 {
  digitalWrite(rele2, LOW);
  delay(100);
  digitalWrite(rele1, HIGH);                    // pohyb motoru vpred
 }
 else if (i>=vaha)
 {
  digitalWrite(rele1, LOW);                    // pohyb motoru vpred
  delay(100);
  digitalWrite(rele2, HIGH);
 }



  if (i>=5000)                                  //pri vaze nad 5kg napis pretizeni
  {
  i=0;
  lcd.setCursor(0, 0);                          // set cursor to secon row
  lcd.print("  Over Loaded   "); 
  delay(200);
  }
  
  if (digitalRead (taree) == LOW)               //pri stisku tlacitka proved taru
  {
    lcd.setCursor(0, 1);                        // set cursor to secon row
    lcd.print("   Taring...    ");
    LoadCell.start(1000);                       // snímače zatížení mají 1000 ms času na stabilizaci a vynulování
    lcd.setCursor(0, 1);
    lcd.print("                ");
  }
}