#include <HX711_ADC.h>

//HX711 constructor (dout pin, sck pin)
HX711_ADC LoadCell_1(A3, A2); //HX711 1
HX711_ADC LoadCell_2(A1, A0); //HX711 2

long t;

void setup() {
  Serial.begin(9600); delay(10);
  Serial.println();
  Serial.println("Starting...");
  LoadCell_1.begin();
  LoadCell_2.begin();
  long stabilisingtime = 2000; // tare preciscion can be improved by adding a few seconds of stabilising time
  byte loadcell_1_rdy = 0;
  byte loadcell_2_rdy = 0;
  while ((loadcell_1_rdy + loadcell_2_rdy) < 2) { //run startup, stabilization and tare, both modules simultaniously
    if (!loadcell_1_rdy) loadcell_1_rdy = LoadCell_1.startMultiple(stabilisingtime);
    if (!loadcell_2_rdy) loadcell_2_rdy = LoadCell_2.startMultiple(stabilisingtime);
  }
  LoadCell_1.setCalFactor(100); // user set calibration value (float)
  LoadCell_2.setCalFactor(100); // user set calibration value (float)
  Serial.println("Startup + tare is complete");
}

void loop() {
  //update() should be called at least as often as HX711 sample rate; >10Hz@10SPS, >80Hz@80SPS
  //longer delay in scetch will reduce effective sample rate (be carefull with use of delay() in the loop)
  LoadCell_1.update();
  LoadCell_2.update();

  //get smoothed value from data set + current calibration factor
  if (millis() > t + 250) {
    long a = LoadCell_1.getSingleConversionRaw();  
    long b = LoadCell_2.getSingleConversionRaw();  
    Serial.print("Load_cell 1 output val: ");
    Serial.print(a);
    Serial.print("    Load_cell 2 output val: ");
    Serial.println(b);
    t = millis();
  }
}