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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; | |
| } | |
| } |
May I know how you deal with the condition of load cell reading keep fluctuate?
The schematic can be found on Sparkfun's website: https://learn.sparkfun.com/tutorials/load-cell-amplifier-hx711-breakout-hookup-guide
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.
how can we get the value 0.035274? its mean 1 gram?
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?
no matching function for call to 'HX711:: HX711(int, int)'. please help me with this issue.
just call: HX711 scale; instead of HX711 scale(DOUT, CLK)
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
I have already tried this but it doesn’t work for me. How do i define the pins of the two HX711?
Thanks
call HX711 scale;
and then in the setup call scale.begin(DOUT,SCK);
#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
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 48LiquidCrystal 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
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 ().
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.
Could you attach the diagram or schematic for this project. I would be grateful if you could share it, thank you sir .