// https://electropeak.com/learn/interface-hx711-load-cell-amplifier-module-arduino-digital-weight-scale/
/* 
 *  Digital Weighing Scale with Load Cell
 *  by Hanie kiani
 *  https://electropeak.com/learn/   
 */

#include "HX711.h"  //You must have this library in your arduino library folder
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
#define DOUT  4
#define CLK  5
 
HX711 scale;
 
float calibration_factor = 420; // this calibration factor is adjusted according to my load cell
float units;
 
void setup() {
  scale.begin(DOUT, CLK);
  lcd.begin(16,2);
  Serial.begin(9600);  
  Serial.println("Press T to tare");
 
  scale.set_scale(calibration_factor); //Adjust to this calibration factor
  scale.tare(); 
}
 

void loop() {
  
  units = scale.get_units(), 5;
  // if (units < 0)
  // {
  //   units = 0.00;
  // }
  lcd.setCursor(0,0);
  lcd.print("Weight: ");
  lcd.setCursor(8,0);
  lcd.print(units,5); //displays the weight in 4 decimal places only for calibration
  lcd.setCursor(14,0);
  lcd.print("grams");
   
   
  if(Serial.available())
  {
    char temp = Serial.read();
    if(temp == 't' || temp == 'T')
      scale.tare();  //Reset the scale to zero      
  }
}