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examples/Persistent_zero_offset/Persistent_zero_offset.ino
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/* | ||
------------------------------------------------------------------------------------- | ||
HX711_ADC | ||
Arduino library for HX711 24-Bit Analog-to-Digital Converter for Weight Scales | ||
Olav Kallhovd sept2017 | ||
------------------------------------------------------------------------------------- | ||
*/ | ||
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/* | ||
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 | ||
*/ | ||
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#include <HX711_ADC.h> | ||
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#if defined(ESP8266)|| defined(ESP32) || defined(AVR) | ||
#include <EEPROM.h> | ||
#endif | ||
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//pins: | ||
const int HX711_dout = 4; //mcu > HX711 dout pin | ||
const int HX711_sck = 5; //mcu > HX711 sck pin | ||
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//HX711 constructor: | ||
HX711_ADC LoadCell(HX711_dout, HX711_sck); | ||
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const int calVal_eepromAdress = 0; | ||
const int tareOffsetVal_eepromAdress = 4; | ||
unsigned long t = 0; | ||
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void setup() { | ||
Serial.begin(57600); delay(10); | ||
Serial.println(); | ||
Serial.println("Starting..."); | ||
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LoadCell.begin(); | ||
float calibrationValue; // calibration value (see example file "Calibration.ino") | ||
calibrationValue = 696.0; // uncomment this if you want to set the calibration value in the sketch | ||
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#if defined(ESP8266)|| defined(ESP32) | ||
EEPROM.begin(512); | ||
#endif | ||
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//EEPROM.get(calVal_eepromAdress, calibrationValue); // uncomment this if you want to fetch the calibration value from eeprom | ||
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//restore the zero offset value from eeprom: | ||
long tare_offset = 0; | ||
EEPROM.get(tareOffsetVal_eepromAdress, tare_offset); | ||
LoadCell.setTareOffset(tare_offset); | ||
boolean _tare = false; //set this to false as the value has been resored from eeprom | ||
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unsigned long stabilizingtime = 2000; // preciscion right after power-up can be improved by adding a few seconds of stabilizing time | ||
LoadCell.start(stabilizingtime, _tare); | ||
if (LoadCell.getTareTimeoutFlag()) { | ||
Serial.println("Timeout, check MCU>HX711 wiring and pin designations"); | ||
while (1); | ||
} | ||
else { | ||
LoadCell.setCalFactor(calibrationValue); // set calibration value (float) | ||
Serial.println("Startup is complete"); | ||
} | ||
} | ||
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void loop() { | ||
static boolean newDataReady = 0; | ||
const int serialPrintInterval = 250; //increase value to slow down serial print activity | ||
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// check for new data/start next conversion: | ||
if (LoadCell.update()) newDataReady = true; | ||
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// 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(); | ||
} | ||
} | ||
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// receive command from serial terminal, send 't' to initiate tare operation: | ||
if (Serial.available() > 0) { | ||
char inByte = Serial.read(); | ||
if (inByte == 't') refreshOffsetValueAndSaveToEEprom(); | ||
} | ||
} | ||
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// zero offset value (tare), calculate and save to EEprom: | ||
void refreshOffsetValueAndSaveToEEprom() { | ||
long _offset = 0; | ||
Serial.println("Calculating tare offset value..."); | ||
LoadCell.tare(); // calculate the new tare / zero offset value (blocking) | ||
_offset = LoadCell.getTareOffset(); // get the new tare / zero offset value | ||
EEPROM.put(tareOffsetVal_eepromAdress, _offset); // save the new tare / zero offset value to EEprom | ||
LoadCell.setTareOffset(_offset); // set value as library parameter (next restart it will be read from EEprom) | ||
Serial.print("New tare offset value:"); | ||
Serial.print(_offset); | ||
Serial.print(", saved to EEprom adr:"); | ||
Serial.println(tareOffsetVal_eepromAdress); | ||
} |
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