When trying to measure weight, the program crashes after a few seconds, sometimes in less than a second.
The issue I am having is during the calibration the script just resets after a few reads. If I do not place anything on the scale during calibration, and just put in a low amount, then the program runs fine, but then crashes as soon as anything is placed on the scale.
Here is what the output is for the calibration example sketch:
Starting...
Startup is complete
***
Start calibration:
Place the load cell an a level stable surface.
Remove any load applied to the load cell.
Send 't' from serial monitor to set the tare offset.
Tare complete
Now, place your known mass on the loadcell.
Then send the weight of this mass (i.e. 100.0) from serial monitor.
Known mass is: 213.00
New calibration value has been set to: 432.60, use this as calibration value (calFactor) in your project sketch.
Save this value to EEPROM adress 0? y/n
Value 432.60 saved to EEPROM address: 0
End calibration
***
To re-calibrate, send 'r' from serial monitor.
For manual edit of the calibration value, send 'c' from serial monitor.
***
Load_cell output val: 213.00
Load_cell output val: 213.01
Load_cell output val: 213.02
Load_cell output val: 213.02
Load_cell output val: 213.03
Load_cell output val: 213.03
Load_cell output val: 213.05
Starting...
Startup is complete
***
Start calibration:
Place the load cell an a level stable surface.
Remove any load applied to the load cell.
Send 't' from serial monitor to set the tare offset.
It reads a few times and then resets.
Here is output for the "Testing" example sketch:
I pushed down on the scale and shortly after it crashes
/*
-------------------------------------------------------------------------------------
HX711_ADC
Arduino library for HX711 24-Bit Analog-to-Digital Converter for Weight Scales
Olav Kallhovd sept2017
-------------------------------------------------------------------------------------
*/
/*
Settling time (number of samples) and data filtering can be adjusted in the config.h file
For calibration and storing the calibration value in eeprom, see example file "Calibration.ino"
The update() function checks for new data and starts the next conversion. In order to acheive maximum effective
sample rate, update() should be called at least as often as the HX711 sample rate; >10Hz@10SPS, >80Hz@80SPS.
If you have other time consuming code running (i.e. a graphical LCD), consider calling update() from an interrupt routine,
see example file "Read_1x_load_cell_interrupt_driven.ino".
This is an example sketch on how to use this library
*/
#include <HX711_ADC.h>
#if defined(ESP8266)|| defined(ESP32) || defined(AVR)
#include <EEPROM.h>
#endif
//pins:
const int HX711_dout = 4; //mcu > HX711 dout pin
const int HX711_sck = 5; //mcu > HX711 sck pin
//HX711 constructor:
HX711_ADC LoadCell(HX711_dout, HX711_sck);
const int calVal_calVal_eepromAdress = 0;
unsigned long t = 0;
void setup() {
Serial.begin(57600); delay(10);
Serial.println();
Serial.println("Starting...");
float calibrationValue; // calibration value
calibrationValue = 696.0; // uncomment this if you want to set this value in the sketch
#if defined(ESP8266) || defined(ESP32)
//EEPROM.begin(512); // uncomment this if you use ESP8266 and want to fetch this value from eeprom
#endif
//EEPROM.get(calVal_eepromAdress, calibrationValue); // uncomment this if you want to fetch this value from eeprom
LoadCell.begin();
//LoadCell.setReverseOutput();
unsigned 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);
if (LoadCell.getTareTimeoutFlag()) {
Serial.println("Timeout, check MCU>HX711 wiring and pin designations");
}
else {
LoadCell.setCalFactor(calibrationValue); // set calibration factor (float)
Serial.println("Startup is complete");
}
while (!LoadCell.update());
Serial.print("Calibration value: ");
Serial.println(LoadCell.getCalFactor());
Serial.print("HX711 measured conversion time ms: ");
Serial.println(LoadCell.getConversionTime());
Serial.print("HX711 measured sampling rate HZ: ");
Serial.println(LoadCell.getSPS());
Serial.print("HX711 measured settlingtime ms: ");
Serial.println(LoadCell.getSettlingTime());
Serial.println("Note that the settling time may increase significantly if you use delay() in your sketch!");
if (LoadCell.getSPS() < 7) {
Serial.println("!!Sampling rate is lower than specification, check MCU>HX711 wiring and pin designations");
}
else if (LoadCell.getSPS() > 100) {
Serial.println("!!Sampling rate is higher than specification, check MCU>HX711 wiring and pin designations");
}
}
void loop() {
static boolean newDataReady = 0;
const int serialPrintInterval = 500; //increase value to slow down serial print activity
// check for new data/start next conversion:
if (LoadCell.update()) newDataReady = true;
// get smoothed value from the dataset:
if (newDataReady) {
if (millis() > t + serialPrintInterval) {
float i = LoadCell.getData();
Serial.print("Load_cell output val: ");
Serial.println(i);
newDataReady = 0;
t = millis();
}
}
// receive command from serial terminal, send 't' to initiate tare operation:
if (Serial.available() > 0) {
char inByte = Serial.read();
if (inByte == 't') LoadCell.tareNoDelay();
}
// check if last tare operation is complete:
if (LoadCell.getTareStatus() == true) {
Serial.println("Tare complete");
}
}
Note: there are no error messages in the console, the program loop just suddenly stops
Sometimes, when trying to upload the sketch, I get this error:
avrdude: stk500_paged_load(): (a) protocol error, expect=0x10, resp=0xe6
avrdude: stk500_cmd(): programmer is out of sync
avr_read(): error reading address 0x0000
read operation not supported for memory "flash"
avrdude: failed to read all of flash memory, rc=-2
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x98
Failed uploading: uploading error: exit status 1
But usually if I reset the arduino then the sketch uploads fine
