Work in progress

I am attempting to enhance this library to enable the usage of multiple HX711 modules with only one clock pin for all modules. All credits for the original work go to Scott Russel; any errors are solely my responsibility. This library is a fork of the Queuetue HX711 Library.

Be aware: "Done" means this is beta level

This means: it works for me (ESP8266) but may have various issues on other plattforms

To-Do	Idea Credits	Status
Understand Arduino Librarys	Wolles Elektronikkiste	May GitHub Copilot bless me
Modify class definition of the Source Library to use arrays	Queuetue HX711 Library	Done
Process sensor data bit by bit	Wolles Elektronikkiste	Done
Add an atomic block for critical operations	bogde	Implementet but untested
Implement a tare method		Done
Keep the code simple		NeverDone

Multi HX711 Arduino Library

Fork of Queuetue HX711 Library Copyright (c) 2015 Scott Russell (scott@queuetue.com), released under the MIT license.
See the LICENSE file for licensing details.

A simple Arduino driver for multiple HX711 ADC.

The HX711 is a low-cost strain gauge amplifier produced by Avia Semiconductor. Breakout boards are available for it by many producers, including the Sparkfun 13230.

The HX711 communicates with a non-i2c compliant two wire protocol and provides an all-in-one solution to load cell amplification with relatively low noise.

This library provides the code required to use an Arduino, the HX711 module and a strain gauge load cell to build a scale, force gauge or many other pressure or force sensitive projects.

Class

The MULTI_HX711 class accepts two parameters during initialization: the pin for data transmission (Output) and the pin for readiness signaling (Clock). Additionally, it can also accept two arrays of pin numbers for more advanced setups. Finally there is a dummy constructor class that expects you to call init() by hand.

Functions

Function	Description	Return Type
MULTI_HX711	Constructor for the MULTI_HX711 class.	N/A
~MULTI_HX711	Destructor for the MULTI_HX711 class.	N/A
init	Initializes the HX711 with a single output and clock pin.	void
init	Initializes the HX711 with arrays of output and clock pins.	void
readyToSend	Checks if the HX711 is ready to send data.	bool
setGain	Sets the gain of the HX711 amplifier.	void
read	Reads the raw data from the HX711.	int32_t*
readTare	Reads the raw data from the HX711 after applying the tare.	int32_t*
readTareKilo (deprecated)	Reads the data from the HX711 after applying the tare and converting it to kilograms. Retained for backward compatibility.	float*
readTareFactorDecimal	Reads the data from the HX711 after applying the tare and scaling it to the desired decimal precision.	int32_t*
setTare	Sets the tare values for subsequent readings.	void
setFactor	Sets the conversion factor for each output pin.	void
setFactor	Sets the conversion factors for all output pins using an array.	void
getNumOut	Returns the number of output pins configured in the HX711 instance.	byte

Example

Here is a simple example of using the HX711

#include <MULTI_HX711.h>

//Global dummy zur initialisierung im Setup
MULTI_HX711 hx711;

void setup() {
  Serial.begin(115200);
  while (!Serial);
  //setup_single();
  setup_multi();
}

void setup_single() {
  
  hx711.init(D5, D7);
  delay(500);//Aufwärmen vor dem Tara
  hx711.setTare(10, 10); //Tara
  //Umrechnung in Kilogramm
  hx711.setFactor(13279);
  Serial.println(F("Setup Complete."));
}


void setup_multi() {
  // Pin Arrays für die HX711-Instanz
  byte out_pins[] = {D5, D6, D1, D2}; // Daten-Pins
  byte clock_pins[] = {D7, D3};      // Clock-Pins
  // Ende Pin Arrays
  hx711.init(out_pins, clock_pins, sizeof(out_pins) / sizeof(byte), sizeof(clock_pins) / sizeof(byte));
  delay(500);//Aufwärmen vor dem Tara
  hx711.setTare(10, 10); //Tara
  //Umrechnung in Kilogramm
  uint16_t factor[] = {13279, 14250, 13079, 14278}; //ausprobierte Werte
  hx711.setFactor(factor);
  Serial.println(F("Setup Complete."));
}

void loop() {
  if (Serial.available() > 0) {
    char command = Serial.read();
    if (command == 't') {
      // Set tare values
      hx711.setTare(10, 10);
      Serial.println(F("Tare completed."));
    }
  }

  if (hx711.readyToSend()) {
    // Read the data and store it in an array
    float* data = hx711.readTareKilo();
    // summiere
    float gesamt = 0.0;
    // Print the data
    for (int i = 0; i < hx711.getNumOut(); i++) {
      Serial.print(F(" Data["));
      Serial.print(i);
      Serial.print(F("]: "));
      Serial.print(data[i]);
      gesamt += data[i];
    }
    Serial.print(F(" In Summe: "));
    Serial.println(gesamt);
    delay(1000);
  }
}