4 DIFFERENT LOAD CELLS WITH 4 HX711??

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1

Hello. I need your help. I have an arduino uno board,4 x hx711 and 4 load cells... And I want to weigh with 4 scales each separately, and each scales to activate a servo. That is, the first scale when the weight is less than 53g (0-53g) the first servo make 180 degrees else 0 degrees. The second scale when weighing is from 53g to 63g make the second servo 180 degrees otherwise 0. The third when the weigh is 63g to 73g make a sevo 180 degrees and the fourth when the weigh is Greater than 73g servo make a 180 degrees.

I can do it? You can tell me the code??

This is my code. I do not know how to put second load cell...

#include "HX711.h"
#define calibration_factor -5990.0 //This value is obtained using the SparkFun_HX711_Calibration sketch
#define DOUT  A3
#define CLK  A2
HX711 scale(DOUT, CLK);


#include "Servo.h"
Servo Servosmall;


int pos = 0;    
int pos2=180;

int small=53;


void setup() {
  Serial.begin(9600);
  Serial.println("HX711 scale demo");

  scale.set_scale(-5990); //This value is obtained by using the SparkFun_HX711_Calibration sketch
  scale.tare(); //Assuming there is no weight on the scale at start up, reset the scale to 0
  
  
  Serial.println("Readings:");
  
  Servosmall.attach(9);
}
void loop() {
  Serial.print("Reading: ");
  Serial.print(scale.get_units(20), 1); //scale.get_units() returns a float
  Serial.print(" g "); //You can change this to kg but you'll need to refactor the calibration_factor
  Serial.println();

if (scale.get_units() > small){ 
    Servosmall.write(pos);
}
  else  {
    Servosmall.write(pos2);
}
}
2

I do not know how to put second load cell...

Explain why you need to. Is the object being weighed going to weigh significantly more or less when you weigh it again?

3

I'm trying to make this construction:

www.youtube.com/watch?v=WUJE1dMNC-M&list=FLAK5JM4t49XlUzAsXmdFnNg

I want to sort the eggs by weight class.

Did you help?

4

Why do you have two threads going on the same topic?

5

I saw your YouTube link. Are you making one of those? It looks like the eggs might crack when they bang into each other.

Why not make a single weight measurement with a a single load cell and categorize the eggs based on the single measurement?

6

finally with a little effort I did it. it works perfectly.
Νow I want help.
I want with two buttons to change the price of small
a button for up (+1gr) and a button for down(-1gr)

how to do this;

This is my code

#include "HX711.h"
#define calibration_factor = -5990.0 

HX711 scale(3,2);
HX711 scale2(5,4);
HX711 scale3(6,7);
HX711 scale4(9,8);


#include "Servo.h"
Servo Servosmall;
Servo Servomedium;
Servo Servolarge;
Servo Servoxlarge;


int pos = 0;    
int pos2=180;

float small= 53;
float medium=63;
float large=73;
float xlarge=83;


void setup() {
  Serial.begin(9600);
  Serial.println("HX711 scale demo");

  scale.set_scale(-5990); //This value is obtained by using the SparkFun_HX711_Calibration sketch
  scale.tare(); //Assuming there is no weight on the scale at start up, reset the scale to 0

  scale2.set_scale(-5990); //This value is obtained by using the SparkFun_HX711_Calibration sketch
  scale2.tare(); //Assuming there is no weight on the scale at start up, reset the scale to 0

  scale3.set_scale(-5990); //This value is obtained by using the SparkFun_HX711_Calibration sketch
  scale3.tare(); //Assuming there is no weight on the scale at start up, reset the scale to 

  scale4.set_scale(-5990); //This value is obtained by using the SparkFun_HX711_Calibration sketch
  scale4.tare(); //Assuming there is no weight on the scale at start up, reset the scale to 


  
  Serial.println("Readings:");
  
  Servosmall.attach(13);
  Servomedium.attach(12);
  Servolarge.attach(11);
  Servoxlarge.attach(10);
  
}
void loop() {
  Serial.print("scale 1: ");
  Serial.print(scale.get_units(1), 2); //παρε μοναδες (1) με (2) δικαδικα ψιφια
  Serial.print(" g \t|"); //You can change this to kg but you'll need to refactor the calibration_factor
  
  Serial.print("scale 2: ");
  Serial.print(scale2.get_units(1), 2); //scale.get_units() returns a float
  Serial.print(" g\t| "); //You can change this to kg but you'll need to refactor the calibration_factor
 
  Serial.print("scale 3: ");
  Serial.print(scale3.get_units(1), 2); //scale.get_units() returns a float
  Serial.print(" g \t|"); //You can change this to kg but you'll need to refactor the calibration_factor
 
  Serial.print("scale 4: ");
  Serial.print(scale4.get_units(1), 2); //scale.get_units() returns a float
  Serial.print(" g "); //You can change this to kg but you'll need to refactor the calibration_factor
 
  Serial.println();

if (scale.get_units() > small){
    Servosmall.write(pos);}
  else  {
    Servosmall.write(pos2);}


if (scale2.get_units() < small && scale2.get_units() > medium){ 
    Servomedium.write(pos);
}
  else  {
    Servomedium.write(pos2);
  }

if (scale3.get_units() < medium && scale3.get_units() > large){ 
    Servolarge.write(pos);
}
  else  {
    Servolarge.write(pos2);
  }
  if (scale4.get_units() < large && scale4.get_units() > xlarge){ 
    Servoxlarge.write(pos);
}
  else  {
    Servoxlarge.write(pos2);
  }


  

    if(Serial.available())
  {
    char temp = Serial.read();
    if(temp == '+' || temp == 'a')
      small += 1;
    else if(temp == '-' || temp == 'z')
      small -= 1;
  }
}