#include "HX711.h"
#include <LiquidCrystal_I2C.h>

#define I2C_ADDR  0x27
#define CLK   13  // clock pin
#define DOUT1 5  // data pin to 1 HX711
#define DOUT2 6  // data pin to 2 HX711
#define DOUT3 7  // data pin to 3 HX711
#define DOUT4 8  // data pin to 4 HX711
#define SCALE_FACTOR 420.0 // wokwi equates 1kg to 420 "units"

String delim="  ";
byte DOUTS[4] = {DOUT1, DOUT2, DOUT3, DOUT4};
constexpr int channelCount = 4;
HX711 scales[channelCount];
LiquidCrystal_I2C lcd(I2C_ADDR, 16, 2);

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.setCursor(3,0);//col-row
  lcd.print("HX711-Multi");
  lcd.setCursor(2,1);
  lcd.print("#vedroracers");
  scales[0].begin(DOUTS[0], CLK);
  scales[1].begin(DOUTS[1], CLK);
  scales[2].begin(DOUTS[2], CLK);
  scales[3].begin(DOUTS[3], CLK);
  delay(2000);
  lcd.clear();
  lcd.print("taring");
  scales[0].tare(5);
  lcd.print(".");
  scales[1].tare(5);
  lcd.print(".");
  scales[2].tare(5);
  lcd.print(".");
  scales[3].tare(5);
  lcd.print("done");
  delay(1000);
  lcd.clear();
  lcd.print(scales[0].get_offset());
  lcd.print(delim);
  lcd.print(scales[1].get_offset());
  lcd.print(delim);
  lcd.setCursor(0,1);
  lcd.print(scales[2].get_offset());
  lcd.print(delim);
  lcd.print(scales[3].get_offset());
  delay(3000);
  scales[0].set_scale(SCALE_FACTOR);
  scales[1].set_scale(SCALE_FACTOR);
  scales[2].set_scale(SCALE_FACTOR);
  scales[3].set_scale(SCALE_FACTOR);
  lcd.clear();
}

void loop() {
  lcd.print(scales[0].get_units(), 2);
  lcd.print(delim);
  lcd.print(scales[1].get_units(), 2);
  lcd.print(delim);
  lcd.setCursor(0,1);
  lcd.print(scales[2].get_units(), 2);
  lcd.print(delim);
  lcd.print(scales[3].get_units(), 2);
  lcd.home();
  delay(500);
}