Erroneous data after setSamplesInUse()

[sonic74]

When doing

LoadCell.begin();
long stabilizingtime = 2000; // tare preciscion can be improved by adding a few seconds of stabilizing time
boolean _tare = true; //set this to false if you don't want tare to be performed in the next step
LoadCell.start(stabilizingtime, _tare);
LoadCell.setCalFactor(calibrationValue); // user set calibration value (float)
LoadCell.setSamplesInUse(1)
if (LoadCell.update()) newDataReady = true;
//get smoothed value from data set
if (newDataReady) {
  float a = LoadCell.getData();
}

I get wrong data. Shouldn't

HX711_ADC/src/HX711_ADC.h

Line 112 in dff0de8

long lastSmoothedData;

be initialized to 0?

[olkal]

Hi!
Initializing lastSmoothedData in the .h file should not be required as it is being assigned to a value before use (in line 258 of the .cpp file).

I'm not able to replicate an error using setSamplesInUse(1), output data is as expected. Could you please provide the complete sketch?

[sonic74]

Initializing lastSmoothedData in the .h file should not be required as it is being assigned to a value before use (in line 258 of the .cpp file).

Only when calling getData() before setSamplesInUse()

[olkal]

You're right. I have revised the header file according to your comment, thanks.

[sonic74]

Unfortunately, the missing initialisation doesn't seem to have been the culprit. As a workaround I now added refreshDataSet() after setSamplesInUse()