Comments (6)
Thanks, I'm glad you like it!
First of all, the value that decides the number of samples is a definition, not a variable, hence it can not be changed after compilation.
The scetch and the library files are compiled seperatly, and I'm not aware of any way to pass a value from the scetch that will affect the compilation of the library. You could make a way to pass a value in the scetch to reduce the numper of samples actually used by the library, but as the size of the declared dataset array directly affects memory usage it's not a good ida to declare a larger dataset array than you actually need.
So the anwer is no, unless someone can come up with a way to do this without making the library more complicated to use, and without using more memory than neccesary.
Olav
from hx711_adc.
Hi, I also would be interested in a way to change the number of samples: I am changing the speed on the fly and would like to adjust the number of samples together with the speed change. Would that be possible?
from hx711_adc.
Hi
Well, yes that should be possible by compiling the full data set and then (on the fly) restricting the library to operate with only a given limited section of the full set. I'm re-opening this Issue. Give me a couple of days and I will look into it.
from hx711_adc.
Thanks, that will help a lot!
from hx711_adc.
Hi!
You should now be able to use the new function setSamplesInUse(int samples) and getSamplesInUse() to manipulate/override the number of samples in use at the time to a lower value than defined in the config.h file. Note that the memory usage will reflect that of the compiled data set and will not be reduced by using this function.
from hx711_adc.
Hi! That helps, thanks a lot! And I can confirm that everything works well on the ADS1231. Just had to do new calibrations because the tare factor changed, but that's no problem at all. I just your old calibration sketch and modified it to give me filtered results, in case you are interested I copy it here:
//-------------------------------------------------------------------------------------
// HX711_ADC.h
// Arduino master library for HX711 24-Bit Analog-to-Digital Converter for Weigh Scales
// Olav Kallhovd sept2017
// Tested with : HX711 asian module on channel A and YZC-133 3kg load cell
// Tested with MCU : Arduino Nano
//-------------------------------------------------------------------------------------
/* This is an example sketch on how to find correct calibration factor for your HX711:
- Power up the scale and open Arduino serial terminal
- After stabelizing and tare is complete, put a known weight on the load cell
- Observe values on serial terminal
- Adjust the calibration factor until output value is same as your known weight:
- Sending 'l' from the serial terminal decrease factor by 1.0
- Sending 'L' from the serial terminal decrease factor by 10.0
- Sending 'h' from the serial terminal increase factor by 1.0
- Sending 'H' from the serial terminal increase factor by 10.0
- Sending 't' from the serial terminal call tare function
- Sending 'T' from the serial terminal call big tare function
- Observe and note the value of the new calibration factor
- Use this new calibration factor in your sketch
*/
#include "FastRunningMedian.h"
#include <HampelFilter.h>
HampelFilter tareHampel = HampelFilter(0.00, 19, 0.02);
FastRunningMedian<uint32_t, 19, 0> tareMedian;
#include <HX711_ADC.h>
// I modified the settings in config.h as follows:
// SAMPLES 64
// IGN_HIGH_SAMPLE 1
// IGN_LOW_SAMPLE 0
#define scale_DATA 0
#define scale_SCLK 1
#define scale_PWDN 2
#define scale_SPEED 22
//HX711 constructor (dout pin, sck pin)
HX711_ADC LoadCell(scale_DATA, scale_SCLK);
long t;
void setup() {
Serial.begin(115200);
pinMode(scale_PWDN, OUTPUT);
digitalWrite(scale_PWDN, HIGH); // keep high to stay on
pinMode(scale_SPEED, OUTPUT);
digitalWrite(scale_SPEED, LOW); // keep high for high speed
delay(300);
Serial.println("preparing...");
LoadCell.begin();
long stabilisingtime = 5000; // tare preciscion can be improved by adding a few seconds of stabilising time
LoadCell.start(stabilisingtime);
LoadCell.setCalFactor(25830.0f); // user set calibration factor (float)
LoadCell.setTareOffset(8380000);
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 delay() in loop)
LoadCell.update();
//get smoothed value from data set + current calibration factor
if (millis() > t + 250) {
float i = LoadCell.getData();
float v = LoadCell.getCalFactor();
Serial.print("Load_cell output val: ");
Serial.print(i);
Serial.print(" Load_cell calFactor: ");
Serial.println(v);
t = millis();
}
//receive from serial terminal
if (Serial.available() > 0) {
float i;
char inByte = Serial.read();
if (inByte == 'l') i = -1.0;
else if (inByte == 'L') i = -10.0;
else if (inByte == 'h') i = 1.0;
else if (inByte == 'H') i = 10.0;
else if (inByte == 'T') multiple_tare();
else if (inByte == 't') LoadCell.tareNoDelay();
if (i != 't') {
float v = LoadCell.getCalFactor() + i;
LoadCell.setCalFactor(v);
}
}
//check if last tare operation is complete
if (LoadCell.getTareStatus() == true) {
Serial.print("Tare offset: ");
Serial.println(LoadCell.getTareOffset());
}
}
void multiple_tare() {
Serial.println("wait, calculating... this will take long... countdown:");
for (int i = 0; i < 20; i++) {
Serial.println(20 - i);
delay(250);
LoadCell.tare();
uint32_t value = LoadCell.getTareOffset();
tareMedian.addValue(value);
double value_f = double(value) / double(2500000);
tareHampel.write(value_f);
}
Serial.print("Tare by runningMedian: ");
Serial.println(tareMedian.getMedian());
Serial.print("Tare by HampelFilter: ");
Serial.println(2500000 * tareHampel.readMedian());
Serial.print("Tare by both filters: ");
double tare_offset = 0.5 * (tareMedian.getMedian() + 2500000 * tareHampel.readMedian());
Serial.println(tare_offset);
LoadCell.setTareOffset(tare_offset);
}
from hx711_adc.
Related Issues (20)
- Test.ino issue HOT 3
- Load_cell output val: NAN HOT 6
- ESP32 Wroom Pin For CLK HOT 2
- Question on Smoothing HOT 2
- Have problem with starting the code. HOT 2
- Slow data readings HOT 4
- UNITTTTTTTT!!!!!!!!!!!!! HOT 4
- Some error While test HOT 2
- No real issue - pls provide an example on how to use New funtions from v1.2.12 HOT 4
- Read_2x_load_cell example not working - potential issue with calling .begin() on multiple HX711_ADC objects HOT 2
- help wanted: How to set Sampling rate from ESP32 HOT 8
- Understanding Multi Point Calibration HOT 2
- Question about HX711_ADC::start functions HOT 1
- Strange Observation HOT 4
- DOUT and SCK PIN declarations HOT 1
- tare at startup HOT 6
- How , do I set calibration factor for 2 different channels HOT 4
- Compatibility issue with ESP32-S3 Dev Board HOT 3
- Hi, did the mass value needed for the calibration its unit is gram or something else? HOT 1
- How to read the value in setup method HOT 5
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