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matt448/hx711_calibration.ino Last active March 13, 2023 16:56 Show Gist options

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/*

Started with example code written by Nathan Seidle from SparkFun Electronics and added

LCD output with gram and ounce values.

Setup your scale and start the sketch WITHOUT a weight on the scale

Once readings are displayed place the weight on the scale

Press +/- or a/z to adjust the calibration_factor until the output readings match the known weight

Arduino pin 6 -> HX711 CLK

Arduino pin 5 -> HX711 DOUT

Arduino pin 5V -> HX711 VCC

Arduino pin GND -> HX711 GND

The HX711 board can be powered from 2.7V to 5V so the Arduino 5V power should be fine.

The HX711 library can be downloaded from here: https://github.com/bogde/HX711

*/

#include <LiquidCrystal.h>

LiquidCrystal lcd(51, 50, 49, 48, 47, 46);

#include "HX711.h"

#define DOUT 5

#define CLK 6

HX711 scale(DOUT, CLK);

float calibration_factor = 2125; //-7050 worked for my 440lb max scale setup

float units;

float ounces;

void setup() {

Serial.begin(9600);

// set up the LCD's number of columns and rows:

lcd.begin(20, 4);

lcd.setCursor(0, 0);

lcd.print("HX711 calibration");

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");

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);

}

void loop() {

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

Serial.print("Reading: ");

units = scale.get_units(), 10;

if (units < 0) {

units = 0.00;

}

ounces = units * 0.035274; //Convert grams to ounces

Serial.print(units);

Serial.print(" grams");

Serial.print(" calibration_factor: ");

Serial.print(calibration_factor);

Serial.println();

lcd.setCursor(0, 1);

lcd.print("Grams: ");

lcd.print(units);

lcd.setCursor(0, 2);

lcd.print("Ounce: ");

lcd.print(ounces);

lcd.setCursor(0, 3);

lcd.print("Calbr: ");

lcd.print(calibration_factor);

if(Serial.available())

{

char temp = Serial.read();

if(temp == '+' || temp == 'a')

calibration_factor += 1;

else if(temp == '-' || temp == 'z')

calibration_factor -= 1;

}

}

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huykhoiha commented Aug 2, 2017

Could you attach the diagram or schematic for this project. I would be grateful if you could share it, thank you sir .

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Koktung commented Sep 26, 2017

May I know how you deal with the condition of load cell reading keep fluctuate?

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matt448 commented Feb 14, 2018

The schematic can be found on Sparkfun's website: https://learn.sparkfun.com/tutorials/load-cell-amplifier-hx711-breakout-hookup-guide

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matt448 commented Feb 14, 2018

For the fluctuations I think one strategy could be to take several readings over a short period of time and average them. Something else to consider is that the fluctuation is happening at less than one gram. You could just round to the nearest gram and the readings would be more stable.

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muliahanif commented Jan 28, 2019

how can we get the value 0.035274? its mean 1 gram?

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Cutie95 commented Feb 12, 2019

Hi. Currently, I had set up a weighing system where it's set to zero when there is no weight on the load cell. However, the weighing system is placed in the open-air environment where it might consist of some dirt and animals (such as kittens, dog or rats) above the weighing system which caused the system to be incorrect. May I know how to code the load cell to subtract the weight on the weighing system to auto-calibrate periodically it?

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sravyasona commented Jun 30, 2019

no matching function for call to 'HX711:: HX711(int, int)'. please help me with this issue.

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jay58 commented Jul 18, 2019

just call: HX711 scale; instead of HX711 scale(DOUT, CLK)

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AndreasAsiikkis commented Aug 8, 2019

Hi,

I am having the same problem as sravyasona. I am using 2 load cells for my project so my code looks like this at the start:

#include<LiquidCrystal.h> #include <HX711.h> #define RST 10 #define DOUT 22 #define CLK 24 #define DOUT1 46 #define CLK1 48

LiquidCrystal lcd(8, 9, 4, 5, 6, 7);

int serial_in; HX711 scale(DOUT, CLK); HX711 scale1(DOUT1, CLK1);

The error that shows up is : no matching function for call to 'HX711::HX711(int, int)'

Any help would be appreciated. I have not much experience with arduino. Thanks, Andreas

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sravyasona commented Aug 8, 2019 via email

Call HX711 scale; instead of HX711 scale(DOUT, CLK); … On Thu., Aug. 8, 2019, 12:30 p.m. Andreas Ashikkis, < ***@***.***> wrote: Hi, I am having the same problem as sravyasona. I am using 2 load cells for my project so my code looks like this at the start: #include<LiquidCrystal.h> #include <HX711.h> #define RST 10 #define DOUT 22 #define CLK 24 #define DOUT1 46 #define CLK1 48 LiquidCrystal lcd(8, 9, 4, 5, 6, 7); int serial_in; HX711 scale(DOUT, CLK); HX711 scale1(DOUT1, CLK1); The error that shows up is : no matching function for call to 'HX711::HX711(int, int)' Any help would be appreciated. I have not much experience with arduino. Thanks, Andreas — You are receiving this because you commented. Reply to this email directly, view it on GitHub <https://gist.github.com/14d118e2fc5b6217da11?email_source=notifications&email_token=ALQENGVCGIHQDUCG4XC2V5TQDRQ3PA5CNFSM4H4LO4SKYY3PNVWWK3TUL52HS4DFVNDWS43UINXW23LFNZ2KUY3PNVWWK3TUL5UWJTQAFWXD6#gistcomment-2993727>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ALQENGRLAME4BT27LDG4NITQDRQ3PANCNFSM4H4LO4SA> .

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AndreasAsiikkis commented Aug 8, 2019

I have already tried this but it doesn’t work for me. How do i define the pins of the two HX711?

Thanks

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sravyasona commented Aug 8, 2019 via email

This pic may help you dear … On Thu., Aug. 8, 2019, 2:06 p.m. Andreas Ashikkis, ***@***.***> wrote: I have already tried this but it doesn’t work for me. How do i define the pins of the two HX711? Thanks — You are receiving this because you commented. Reply to this email directly, view it on GitHub <https://gist.github.com/14d118e2fc5b6217da11?email_source=notifications&email_token=ALQENGTVMOPKQB2D26BWOALQDR4FLA5CNFSM4H4LO4SKYY3PNVWWK3TUL52HS4DFVNDWS43UINXW23LFNZ2KUY3PNVWWK3TUL5UWJTQAFWXJG#gistcomment-2993811>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ALQENGT7KS2HGL2LJUQQ2EDQDR4FLANCNFSM4H4LO4SA> .

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madhavmaheshwari commented Oct 19, 2019

call HX711 scale; and then in the setup call scale.begin(DOUT,SCK);

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Dhanush21-dg commented Mar 15, 2020

#include<LiquidCrystal.h> #include "HX711.h" #define RST 10 #define DOUT 22 #define CLK 24 #define DOUT1 46 #define CLK1 48

LiquidCrystal lcd(8, 9, 7, 6, 5, 4);

int serial_in; HX711 scale; HX711 scale1;

Try this code..... and comment if you get any error

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viet30081999 commented Nov 25, 2020

Hi,

I am having the same problem as sravyasona. I am using 2 load cells for my project so my code looks like this at the start:

#include<LiquidCrystal.h> #include <HX711.h> #define RST 10 #define DOUT 22 #define CLK 24 #define DOUT1 46 #define CLK1 48

LiquidCrystal lcd(8, 9, 4, 5, 6, 7);

int serial_in; HX711 scale(DOUT, CLK); HX711 scale1(DOUT1, CLK1);

The error that shows up is : no matching function for call to 'HX711::HX711(int, int)'

Any help would be appreciated. I have not much experience with arduino. Thanks, Andreas

HX711 scale; void setup(){ scale.begin(DOUT, CLK); } // this is ok

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Hfrag commented Dec 29, 2021

In line 59 you wrote: units = scale.get_units(), 10; What it really means?

Number 10 is not an argument of get units function, but rather the number of times that some function will be rolled but it is outside funcion variables ().

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flowmeter commented May 9, 2022 • edited Loading

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Hi, Something seems strange on line 30 ;

`float calibration_factor = 2125; //-7050 worked for my 440lb max scale setup'

2125 seems to be :

• a constant
• an unsigned integer

Best.

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