HX711 library issues and updating the test code - undefined reference error

Using Arduino Programming Questions
1

I've been following this tutorial on how to calibrate the HX711: https://www.brainy-bits.com/load-cell-and-hx711-with-arduino/

However, the HX711.h libraries have been updated hence the test script is having issues.
I have worked through the errors line by line however I cannot get past this error:

Arduino: 1.8.11 (Mac OS X), Board: "Arduino Uno"
the .h and .cpp files are included in the same folder. I have also attached all source codes.
The error doesn't make sense. I have tried moving the defining outside the loop but nope

error is:
undefined reference to `get_units()'

the modified code:

/* Calibration sketch for HX711 */
 
#include "HX711.h"  // Library needed to communicate with HX711 https://github.com/bogde/HX711
//#include "HX711.cpp"  
#define DOUT  5  // Arduino pin 6 connect to HX711 DOUT
#define CLK  4  //  Arduino pin 5 connect to HX711 CLK
 
HX711 scale();  // Init of library

void setup() {
  Serial.begin(9600);
  //scale.begin(DOUT,CLK);
void set_scale();  // Start scale
 void tare();       // Reset scale to zero

}
 
void loop() {
float  get_units();
float current_weight;
 current_weight=get_units();  
  
  float scale_factor=(current_weight/0.145);  // divide the result by a known weight
  Serial.println(scale_factor);  // Print the scale factor to use
}

caliberation_sketch_for_HX711.ino (695 Bytes)

HX711.cpp (7.01 KB)

HX711.h (2.76 KB)

2

The code will never work as written. You're not calling the functions of the class correctly. You have to make those calls using the name of the object you instantiated --- i.e. current_weight = scale.scale.get_units();

Trash what you have and work the examples that come with the library.

3

the examples that come with the tutorial and library do not work. Because the libraries were updated. class scale no longer exists. I managed to bypass the error by doing

float get_units(20);
float current_weight;
 current_weight=get_units;