AVERAGE READING of the drag and lift forces

[jun325]

Hi guys.. hope you can help me this one.. Since the reading of my load cell fluctuates due to the vibration and other factors, I need to find its average. By the way i use a millligrams unit.

#include "HX711.h"

// HX711 circuit wiring
const int DF_DOUT = 2; // DOUT for drag
const int DF_SCK = 4; // SCK for Drag

const int LF_DOUT = 11; // DOUT for Lift
const int LF_SCK = 12; // SCK for Lift

//HX711 constructor:
HX711 DFORCE;
HX711 LFORCE;

void setup() {
Serial.begin(38400);
Serial.println();
Serial.println("Starting Set Up...");
DFORCE.begin(DF_DOUT, DF_SCK);
DFORCE.set_scale();
DFORCE.tare();

LFORCE.begin(LF_DOUT, LF_SCK);
LFORCE.set_scale();
LFORCE.tare();

}

void loop() {
long DragOrigRead = DFORCE.read ();
long Drag2ndRead;
long Drag1stRead;

long LiftOrigRead = LFORCE.read ();
long Lift2ndRead;
long Lift1stRead;

Serial.println();
Serial.println();
Serial.println("Start The Fan And Set A Desired Velocity");

Drag1stRead = (-000.524* LiftOrigRead) -127008.2+14000;

Lift1stRead = (-000.525* DragOrigRead) +37008.2+52000;

Serial.print("Drag Force Reading Is:");
Serial.print(Drag1stRead);

Serial.println();
Serial.print("Lift Force Reading Is:");
Serial.print(Lift1stRead);

delay(10000);

}

[anon73444976]

So, sum a number of readings, and divide the sum by the number of readings.

If you need a moving average, there are libraries for that, or you can write a simple circular buffer, so you subtract the oldest reading and add the newest to a running total.

[jun325]

thank you for the response sir..by the way hows my code gonna look like??..can you show me sir?

[gcjr]

you can also try leaky integration

avg += (reading - avg) * K; // K < 1

[jun325]

hows gonna my code look like?

[anon73444976]

You need to decide how you want your software to perform.

[jun325]

how and where to insert that line to my code?

[Alexitoo]

Your code can be structured like this, using an enum statement and converting all your code into separated functions:

#include "HX711.h"

// Declare functions
enum MeasurementType {drag, lift};
long takeMeasurement(MeasurementType type);
long getAverage(MeasurementType type, int N_Measurement);

// HX711 circuit wiring
const int DF_DOUT = 2; // DOUT for drag
const int DF_SCK = 4; // SCK for Drag

const int LF_DOUT = 11; // DOUT for Lift
const int LF_SCK = 12; // SCK for Lift

//HX711 constructor:
HX711 DFORCE;
HX711 LFORCE;

void setup() {
  Serial.begin(38400);
  Serial.println();
  Serial.println("Starting Set Up…");
  DFORCE.begin(DF_DOUT, DF_SCK);
  DFORCE.set_scale();
  DFORCE.tare();

  LFORCE.begin(LF_DOUT, LF_SCK);
  LFORCE.set_scale();
  LFORCE.tare();

}

void loop() {
  long DragRead = getAverage(DFORCE, drag, 5);  // Get the drag average of 5 measurements
  long LiftRead = getAverage(LFORCE, lift, 5);  // Get the lift average of 5 measurements

  Serial.print("Drag Force Reading Is:");
  Serial.print(DragRead);

  Serial.println();
  Serial.print("Lift Force Reading Is:");
  Serial.print(LiftRead);

  // THE CODE YOU WANT HERE

  delay(10000);
}

long takeMeasurement(HX711 FORCE, MeasurementType type) {
  long measurement = 0;
  switch (type) {
    case drag:
      measurement = (-000.524 * FORCE.read ()) - 127008.2 + 14000;
      break;
    case lift:
      measurement = (-000.525 * FORCE.read ()) + 37008.2 + 52000;
      break;
  }
  return measurement;
}

long getAverage(HX711 FORCE, MeasurementType type, int N_Measurements) {
  long average = 0;
  for (int i = 0; i < N_Measurements; i++) {
    average += takeMeasurement(FORCE, type) / N_Measurements;
  }
  return average;
}

I hope this help you in your project.
Cheers!

[jun325]

thank you very much for your help sir.God Bless​:heart:

[anon73444976]

I'd be inclined to use references for the sensor objects in the functions, then you wouldn't need the enums