Load cell not responding

Projects Programming
1

Hi, my load cell is not reading any values. It is giving me '0 g'. I am using Arduino Mega, HX711, 1kg load cell.

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image1536Ɨ2048 143 KB

void weightControl(float desiredWeight) {
lcd.setCursor(0, 0);
lcd.print("Measuring Weight");

scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN );
scale.set_scale(1590.153);
scale.tare();

float weight = scale.get_units(10); // Read the average of 10 measurements for better stability
Serial.print("Measured Weight: ");
Serial.println(weight, 2);
lcd.setCursor(0, 1);
lcd.print("Weight: ");
lcd.print(weight, 1); // Display weight with one decimal place
lcd.print (" g");

while (weight < desiredWeight) {
// Rotate motor until the target weight is reached
digitalWrite(relayPin, LOW);

}

// Stop the motor
digitalWrite(relayPin, HIGH);
delay(1000);

lcd.clear();
}

2

Welcome to the forum

Please follow the advice given in the link below when posting code, in particular the section entitled 'Posting code and common code problems'

Use code tags (the < CODE/ > icon above the compose window) to make it easier to read and copy for examination

https://forum.arduino.cc/t/how-to-get-the-best-out-of-this-forum

1 Like
3

Hi @3marie_butterfly

welcome to the arduino-forum.

You should post your code inside so called code-tags as a code-section

The code you have posted is not a complete sketch.
Here is a tutorial how to post code as a code-section

This is a demo-code for HX711 based loadcells which prints to the serial monitor.

to what IO-pins do you have connected clock and datapin of the HX711-module?

post a hand drawn schematic what is connected to what

//
//    FILE: HX_kitchen_scale.ino
//  AUTHOR: Rob Tillaart
// PURPOSE: HX711 demo
//     URL: https://github.com/RobTillaart/HX711

#include "HX711.h"

HX711 scale;

uint8_t dataPin = 6;
uint8_t clockPin = 7;

void setup() {
  Serial.begin(115200);
  Serial.println(__FILE__);
  Serial.print("LIBRARY VERSION: ");
  Serial.println(HX711_LIB_VERSION);
  Serial.println();

  scale.begin(dataPin, clockPin);

  Serial.print("UNITS: ");
  Serial.println(scale.get_units(10));

  Serial.println("\nEmpty the scale, press a key to continue");
  while(!Serial.available());
  while(Serial.available()) Serial.read();

  scale.tare();
  Serial.print("UNITS: ");
  Serial.println(scale.get_units(10));


  Serial.println("\nPut 1000 gram in the scale, press a key to continue");
  while(!Serial.available());
  while(Serial.available()) Serial.read();

  scale.calibrate_scale(1000, 5);
  Serial.print("UNITS: ");
  Serial.println(scale.get_units(10));

  Serial.println("\nScale is calibrated, press a key to continue");
  // Serial.println(scale.get_scale());
  // Serial.println(scale.get_offset());
  while(!Serial.available());
  while(Serial.available()) 
  Serial.read();
}


void loop()
{
  Serial.print("UNITS: ");
  Serial.println(scale.get_units(10));
  delay(250);
}
4

Welcome! Can you post an annotated schematic showing exactly how you wired it, be sure to show all connections, parts, power, ground and power sources.

5

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