//Start By The Name Of Allaha
//This Code is written for Weighing scale by Technical minds
#include <HX711_ADC.h>
#include <LiquidCrystal_I2C.h>
#if defined(ESP8266)|| defined(ESP32) || defined(AVR)
#include <EEPROM.h>
#endif
//pins:
const int HX711_dout = 4;                    //mcu > HX711 dout pin
const int HX711_sck = 5;                    //mcu > HX711 sck pin
const int tpin = 3;                        // the pin that the tare pushbutton is attached to
const int  Up_buttonPin   = 9;            // the pin that the up pushbutton is attached to
const int  Down_buttonPin = 8;           // the pin that the down pushbutton is attached to
float buttonPushCounter = 0;            // counter for the number of button presses
float up_buttonState = 0;              // current state of the up button
float up_lastButtonState = 0;         // previous state of the up button
float down_buttonState = 0;          // current state of the up button
float down_lastButtonState = 0;     // previous state of the up button
bool bPress = false;
//HX711 constructor:
HX711_ADC LoadCell(HX711_dout, HX711_sck);
//LCD_12C:
LiquidCrystal_I2C lcd(0x27, 2, 16);
//EEPROM:
const int calVal_eepromAdress = 0;
unsigned long t = 0;
// Setup:
void setup() {
  Serial.begin(57600); delay(10);
  //Serial.println();
  //Serial.println("Starting...");
  pinMode(tpin, INPUT_PULLUP);
  pinMode( Up_buttonPin , INPUT_PULLUP);
  pinMode( Down_buttonPin , INPUT_PULLUP);
  pinMode(6, OUTPUT);
  pinMode(12, OUTPUT);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(2, 0);
  lcd.print("MERIT  BREAD");
  lcd.setCursor(1, 1);
  lcd.print("WEIGHING SCALE");
  delay(2000);
  lcd.clear();
  //Start weighing: 
  LoadCell.begin();
  //LoadCell.setReverseOutput(); //uncomment to turn a negative output value to positive
  unsigned long stabilizingtime = 2000; // preciscion right after power-up can be improved by adding a few seconds of stabilizing time
  boolean _tare = true; //set this to false if you don't want tare to be performed in the next step
  LoadCell.start(stabilizingtime, _tare);
  if (LoadCell.getTareTimeoutFlag() || LoadCell.getSignalTimeoutFlag()) {
    //Serial.println("Timeout, check MCU>HX711 wiring and pin designations");
    while (1);
  }
  else {
    LoadCell.setCalFactor(420.0); // user set calibration value (float), initial value 1.0 may be used for this sketch
    //Serial.println("Startup is complete");
  }
  while (!LoadCell.update());
}

void loop() {
  static boolean newDataReady = 0;
  const int serialPrintInterval = 0; //increase value to slow down serial print activity

  // check for new data/start next conversion:
  if (LoadCell.update()) newDataReady = true;

  // get smoothed value from the dataset:
  if (newDataReady) {
    if (millis() > t + serialPrintInterval) {
      float i = LoadCell.getData();
      //Serial.print("Load_cell output val: ");
      //Serial.println(i);
      newDataReady = 0;
      t = millis();
      lcd.setCursor(0, 0);
      lcd.print("SET WEI:");
      lcd.setCursor(9, 0);
      lcd.print(buttonPushCounter);
      lcd.setCursor(14, 0);
      lcd.print("KG");
      lcd.setCursor(0, 1);
      lcd.print("WEIGHT :");
      lcd.setCursor(9, 1);
      lcd.print(i);
      lcd.setCursor(14, 1);
      lcd.print("KG");
    }
  }
  checkUp();
  checkDown();
if (digitalRead(tpin) == LOW) {
    LoadCell.tareNoDelay();
  }
  // check if last tare operation is complete:
  if (LoadCell.getTareStatus() == true) {
    lcd.clear();
    lcd.print("Tare complete");
    delay(1000);
    lcd.clear();
  }
  float i = LoadCell.getData();
  float k = buttonPushCounter - i;
  if ( k < 0.05 && k > 0.01 )
  {
    digitalWrite (6, HIGH);
    delay(100);
    digitalWrite (6, LOW);
    delay(200);
  }
  if ( k >= 0.05 )
  {
    digitalWrite (6, HIGH);
    delay(200);
    digitalWrite (6, LOW);
    delay(200);
  }
  if (i >= buttonPushCounter)
  {
    digitalWrite (6, LOW);
    digitalWrite (12, HIGH);
  }
  else
  {
    digitalWrite(12, LOW);
  }
}
void checkUp()
{
  up_buttonState = digitalRead(Up_buttonPin);
  // compare the buttonState to its previous state
  if (up_buttonState != up_lastButtonState)
  {
    // if the state has changed, increment the counter
    if (up_buttonState == LOW)
    {
      bPress = true;
      // if the current state is HIGH then the button went from off to on:
      buttonPushCounter = buttonPushCounter + 0.10;
    }
  }
  // save the current state as the last state, for next time through the loop
  up_lastButtonState = up_buttonState;
}
void checkDown()
{
  down_buttonState = digitalRead(Down_buttonPin);
  // compare the buttonState to its previous state
  if (down_buttonState != down_lastButtonState)
  {
    // if the state has changed, increment the counter
    if (down_buttonState == LOW)
    {
      bPress = true;
      buttonPushCounter = buttonPushCounter - 0.10;
    }
  }
  // save the current state as the last state, for next time through the loop
  down_lastButtonState = down_buttonState;
}