MX PRACTICAL LOAD CELL

/*
* Load Cell HX711 Module Interface with Arduino to measure weight in Kgs
Arduino
pin
2 -> HX711 CLK
3 -> DOUT
5V -> VCC
GND -> GND

Most any pin on the Arduino Uno will be compatible with DOUT/CLK.
The HX711 board can be powered from 2.7V to 5V so the Arduino 5V power should be fine.
*/

#include "HX711.h" //You must have this library in your arduino library folder

#define DOUT 3
#define CLK 2

HX711 scale;

//Change this calibration factor as per your load cell once it is found you many need to vary it in
thousands
float calibration_factor = -8134506; //-106600 worked for my 5Kg max scale setup

//================================================================================
=============
// SETUP
//================================================================================
=============
void setup() {
Serial.begin(9600);

Serial.println("HX711 Calibration");
Serial.println("Remove all weight from scale");
Serial.println("After readings begin, place known weight on scale");
Serial.println("Press a,s,d,f to increase calibration factor by 10,100,1000,10000 respectively");
Serial.println("Press z,x,c,v to decrease calibration factor by 10,100,1000,10000 respectively");
Serial.println("Press t for tare");
scale.begin(DOUT, CLK);
scale.set_scale();
scale.tare(); //Reset the scale to 0

long zero_factor = scale.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.
Serial.println(zero_factor);
}

//================================================================================
=============
// LOOP
//================================================================================
=============
void loop() {

scale.set_scale(calibration_factor); //Adjust to this calibration factor

Serial.print("Reading: ");
Serial.print(scale.get_units()*453.592, 1);
Serial.print("gm"); //Change this to kg and re-adjust the calibration factor if you follow SI units like a
sane person
Serial.print(" calibration_factor: ");
Serial.print(calibration_factor);
Serial.println();

if(Serial.available())
{
char temp = Serial.read();
if(temp == '+' || temp == 'a')
calibration_factor += 10;
else if(temp == '-' || temp == 'z')
calibration_factor -= 10;
else if(temp == 's')
calibration_factor += 100;
else if(temp == 'x')
calibration_factor -= 100;
else if(temp == 'd')
calibration_factor += 1000;
else if(temp == 'c')
calibration_factor -= 1000;
else if(temp == 'f')
calibration_factor += 10000;
else if(temp == 'v')
calibration_factor -= 10000;
else if(temp == 't')
scale.tare(); //Reset the scale to zero
}
}
//================================================================================
=============