//LCD I2C
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,20,4);

//load cell 
#include "HX711.h"
HX711 scale;

//Keypad
#include <Keypad.h>
const byte ROWS = 4; 
const byte COLS = 4; 
char keys[ROWS][COLS] = 
{
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','.'}
};

byte rowPins[ROWS] = {2, 3, 4, 5}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {6, 7, 8,9}; //connect to the column pinouts of the keypad
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

//PID 
#include <PID_v1.h>
double Kp=2, Ki=5, Kd=1;
double Setpoint, Input, Output;
PID myPID(&Input, &Output, &Setpoint, Kp, Ki, Kd, DIRECT);

void setup() 
{
  Serial.begin(115200);
  scale.begin(A1, A0);
  Input = scale.get_units();
}

void loop()
{
  Serial.println(scale.get_units(), 1);
  delay(1000);
}