scale, load cells, multi hx711 amplifiers, arduino uno

I'm making a scale with two and then four load cells (50kg each), two hx711 and arduino uno.
I use code from github and modify it to count mean from two measurements.
I changed pins to analogs and it seems to work better but still I think it's not perfect because measurements depends on point where I put weight.
Can I fix this problem in program?

I put my code in here
I'm new in this world so please answer me like to child :smiley:

code here

#include "HX711-multi.h"
#include "HX711.h"
#define DOUT1 2 
#define CLK1  7
#define DOUT2  3
#define CLK2  4

HX711 scale1;
HX711 scale2;

float calibration_factor1 = -3000; //-7050 worked for my 440lb max scale setup
float calibration_factor2 = -3050; //-7050 worked for my 440lb max scale setup
float suma;
int p;

void setup() {


  Serial.println("HX711 calibration sketch");
  Serial.println("Remove all weight from scale");
  Serial.println("After readings begin, place known weight on scale");
  Serial.println("Press + or a to increase calibration factor");
  Serial.println("Press - or z to decrease calibration factor");

  scale1.begin(DOUT1, CLK1);
  scale1.tare(); //Reset the scale to 0

  scale2.begin(DOUT2, CLK2);
  scale2.tare(); //Reset the scale to 0

  long zero_factor1 = scale1.read_average(); //Get a baseline reading
  long zero_factor2 = scale2.read_average(); //Get a baseline reading

  Serial.print("Zero factor: "); //This can be used to remove the need to tare the scale. Useful in permanent scale projects.

  //pinMode(2, INPUT);
  //attachInterrupt(2, srednia, FALLING );

void loop() {


  scale1.set_scale(calibration_factor1); //Adjust to this calibration factor
  scale2.set_scale(calibration_factor2); //Adjust to this calibration factor

  Serial.print("Reading1: ");
  Serial.print(scale1.get_units(), 2);
  Serial.print(" kg");
  Serial.print(" Reading2: ");
  Serial.print(scale2.get_units(), 2);
  Serial.print(" kg"); //Change this to and re-adjust the calibration factor if you follow SI units like a sane person
  Serial.print(" calibration_factor1: ");
  Serial.print(" calibration_factor2: ");
   Serial.print( "reading: ");
    Serial.println( suma/2);

  if (Serial.available())
    char temp =;
    if (temp == '+')
      calibration_factor1 += 100;
    else if (temp == '-')
      calibration_factor1 -= 100;
    if (temp == 'a')
      calibration_factor2 += 100;
    else if (temp == 'z')
      calibration_factor2 -= 100;


  for(p=0; p<2; p++)
    suma = scale1.get_units() + scale2.get_units();


I thought the weight was the total of all the load cells, not the average.

-jim lee