ChopFiller_Calibaration_LoadCell.txt

#include "HX711.h"
#define DAT  2
#define CLK  3
HX711 scale;

long int calibration_factor = 5050,
prev_calibration_factor =0,
known_mass=0,
read_mass,
flag=0,
state =1,
bytestr;

char 
str[100];

void readingFunc()
{
  while(known_mass==0) { while (Serial.available()>0) {
  bytestr = Serial.readBytesUntil('\0',str,10);
  str[bytestr] = '\0';
  sscanf(str,"%d",&known_mass);
}}}

void setup() 
{
  Serial.begin(9600);
  scale.begin(DAT, CLK);
  scale.set_scale();

  Serial.println("Remove all weight from scale");
  Serial.println("Wait, reset scale...");
  scale.tare(); //Reset the scale to 0
  delay(500); 
  Serial.println("Place your Mass..");
  Serial.println("Then Write the weight of this mass in grams");
  readingFunc();
  
  long zero_factor = scale.read_average(); 
  Serial.print("Zero factor: "); 
  Serial.println(zero_factor);
}

void loop() {
switch (state)
{
case 0:
 Serial.print("Final calibration factor is: ");
 Serial.println(prev_calibration_factor);  
 delay(500);
 Serial.println("Try again with another mass, Write the weight of this mass in grams..");
 known_mass=0;
 prev_calibration_factor=0;
 state=1;
 readingFunc();
break;

case 1:
  scale.set_scale(calibration_factor);
  Serial.print("Target: ");
  Serial.print(known_mass);
  Serial.print(" Reading: ");
  Serial.print(scale.get_units());
  Serial.print(" g"); 
  Serial.print(" calibration_factor: ");
  Serial.print(calibration_factor);
  Serial.println();

  if (Serial.available() > 0)
  {
  bytestr = Serial.readBytesUntil('\0',str,10);
  str[bytestr] = '\0';
  sscanf(str,"%d",&known_mass);
  if(known_mass==0){state=0; break;}
  }
   read_mass=scale.get_units();
   
   if(known_mass!=0){
                     if(known_mass<read_mass)        {calibration_factor += 10;}
                     else if (known_mass>read_mass)  {calibration_factor -= 10;}
                    }
   if(prev_calibration_factor==calibration_factor)
    {
    state=0;
    }
   prev_calibration_factor = calibration_factor;
   delay(10);  
   break;
  }

 
}