calibrate ec for graphite probe

include/ec.h

@@ -64,9 +64,10 @@ float ec_reference_adc=6016.88; //adc reference value for the calibration resist
 //x^0*p[0] + ... + x^n*p[n]
 //float ec_calibration_polynom[]={691.5992624638029,-1.4015367296761692,0.0008513503472324141,-2.2140576823179093e-07,2.8962580780180067e-11,-1.8577565383307114e-15,4.7162479484903865e-20};
 //float ec_calibration_polynom[]={1033.928052655456,-3.8909104921922895,0.005627541436014758,-4.103988840997024e-06,1.7231981870816133e-09,-4.433707707721975e-13,7.203892111369395e-17,-7.406549810844244e-21,4.667420606439905e-25,-1.6439457516812463e-29,2.477292190335455e-34}; //20220505
-float ec_calibration_polynom[]={-323.68589929771457,0.5836096440900665,-0.000279737392438965,5.98673062873e-08,-5.4460235093798435e-12,1.8535134644431135e-16}; //20230509
+//float ec_calibration_polynom[]={-323.68589929771457,0.5836096440900665,-0.000279737392438965,5.98673062873e-08,-5.4460235093798435e-12,1.8535134644431135e-16}; //20230509
 //float ec_calibration_polynom[]={212.6826331524675,-0.6043878865263305,0.000571551634082491,-1.827897106718841e-07,2.682337041246909e-11,-1.8368511021965982e-15,4.8269168538877025e-20}; //20230509 manuell
-float ec_calibration_linearize_below_adc=6500; //use linear approximation below this adc value. 0=disable
+float ec_calibration_polynom[]={-202.42892340068445,0.3775267988688599,-0.0001603031198536654,3.398964768344757e-08,-3.0277753798278316e-12,1.0137804308289433e-16}; //20230620, graphite electrodes
+float ec_calibration_linearize_below_adc=4000; //use linear approximation below this adc value. 0=disable
 float ec_calibration_linear_lowADC=746; //x0
 float ec_calibration_linear_lowEC=0; //y0
 
@@ -163,7 +164,7 @@ void ec_loop(unsigned long loopmillis) {
     if (loopmillis>last_read_ec+EC_READ_INTERVAL) { //take reading into array
       last_read_ec=loopmillis;
 
-      if (loopmillis>ec_last_change_relay+EC_RELAY_SWITCH_SETTLETIME) { //values have settled        
+      if (loopmillis>ec_last_change_relay+EC_RELAY_SWITCH_SETTLETIME) { //values have settled  
         uint16_t value = ADS.readADC(EC_ADS_CHANNEL);
         
         ec_array[ec_array_pos]=value;
@@ -173,10 +174,10 @@ void ec_loop(unsigned long loopmillis) {
       
     }
   }else{ //measurement not running, then take calibration readings
-    if (loopmillis>last_read_ec+EC_CALIB_READ_INTERVAL) { //take reading into array
+    if (loopmillis>last_read_ec+EC_CALIB_READ_INTERVAL) { //take reading into arraysdf
       last_read_ec=loopmillis;
 
-      if (loopmillis>ec_last_change_relay+EC_RELAY_SWITCH_SETTLETIME) { //values have settled        
+      if (loopmillis>ec_last_change_relay+EC_RELAY_SWITCH_SETTLETIME) { //values have settled    
         uint16_t value = ADS.readADC(EC_ADS_CHANNEL);
         
         ec_calib_array[ec_calib_array_pos]=value;

include/wifi_functions.h

@@ -8,6 +8,8 @@
 #include "wifi_settings.h"
 #include "helpfunctions.h"
 
+bool force_ec_measurement=false;
+
 
 struct mqttValueTiming{
     float minchange;
@@ -25,7 +27,7 @@ MQTTClient client;
 bool sendallnext_flag=false;
 bool enableTiming=true;
 
-bool force_ec_measurement=false;
+
 
 void publishValueTimed(String topic,float value,uint8_t decimals,mqttValueTiming &mqttvt,unsigned long loopmillis);
 void publishValue(String topic,float value,uint8_t decimals);

messung/20230620_NaCl_raw.csv

@@ -0,0 +1,41 @@
+time,tempReservoir,ECadcCalib,ECadc,ECadcAdjusted,ecMeasured
+174369,26.75,6026.45,768.41,767.19,15
+226453,26.75,6026.3,768.41,767.2,15
+254513,26.75,6026.81,768.57,767.31,15
+280571,26.75,6027.54,768.12,766.76,15
+298621,26.75,6027.7,768.15,766.77,15
+393748,26.75,6026.95,866.96,865.51,40
+564951,26.75,6026.5,1100.59,1098.84,55
+612030,26.75,6026.8,1240.29,1238.25,60
+676126,26.75,6026.96,1536.88,1534.3,80
+708190,26.75,6027.02,1834.7,1831.62,100
+740254,26.75,6027.66,2122.36,2118.56,120
+772318,26.75,6027.68,2586.95,2582.31,155
+805383,26.75,6027.63,3363.96,3357.96,220
+860470,26.75,6027.38,3874.01,3867.26,260
+906548,26.75,6027.63,4411.25,4403.39,320
+945619,26.78,6027.32,5086.8,5077.99,390
+992698,26.8,6026.66,5780.72,5771.34,470
+1040778,26.81,6026.3,6346.3,6336.38,560
+1095867,26.81,6026.54,6959.73,6948.58,650
+1125929,26.81,6026.76,7704.95,7692.32,780
+1152988,26.81,6026.91,8014.21,8000.88,850
+1184051,26.81,6026.74,8444.22,8430.4,940
+1240140,26.85,6026.3,9119.98,9105.73,1120
+1286218,26.87,6026.59,9769.52,9753.78,1310
+1322286,26.87,6026.39,10601.19,10584.46,1630
+1433429,26.88,6026.82,11137.44,11119.07,1890
+1463491,26.93,6027.01,11235.27,11216.38,1940
+1495555,26.94,6026.65,11451,11432.44,2060
+1524616,26.94,6026.15,11627.25,11609.36,2170
+1556680,26.94,6026.38,11886.32,11867.59,2340
+1590746,26.94,6026.27,12143.11,12124.2,2540
+1639827,26.95,6026.5,12335.04,12315.34,2700
+1676896,27,6026.65,12505.56,12485.29,2850
+1712964,27,6027.25,12673.08,12651.28,3010
+1749032,27,6027.5,12956.33,12933.5,3310
+1822169,27.02,6026.78,13440.36,13418.28,3940
+1853232,27.06,6026.5,13607.09,13585.36,4220
+1895306,27.06,6026.53,13765.66,13743.62,4590
+1935379,27.06,6026.66,13895.97,13873.41,4860
+1967443,27.06,6026.62,13885.23,13862.79,5120

src/main.cpp

@@ -6,6 +6,8 @@
 
 bool debug=true; //print Serial information
 bool mqtt=false;
+bool eccalibrationoutput=false; //serial output for ec calibration
+
 
 
 
@@ -98,8 +100,6 @@ void setup() {
 
   delay(100000);
   */
-  
-  
 
 
   //Serial.println("time,tempReservoir,ECadcCalib,ECadc,ECadcAdjusted,EC,EC25");
@@ -125,15 +125,23 @@ void loop() {
 
   static bool getReading=false;
 
-  if (!digitalRead(PIN_BUTTON)) {
+  if (!eccalibrationoutput && !digitalRead(PIN_BUTTON)) {
     valueError=false;
     Serial.println("Reset ValueError flag by user");
     digitalWrite(PIN_LED,valueError);
     delay(100);
   }
 
-  /*
-  if (ec_flag_measurement_available && getReading) {
+  if (eccalibrationoutput && !digitalRead(PIN_BUTTON) && !getReading) {
+    getReading=true;
+    force_ec_measurement=true;
+    ec_flag_measurement_available=false;
+    digitalWrite(PIN_LED,HIGH);
+  }
+
+  
+  if (eccalibrationoutput && ec_flag_measurement_available && getReading) {
+    
     ec_flag_measurement_available=false;
     getReading=false;
     digitalWrite(PIN_LED,LOW);
@@ -143,7 +151,7 @@ void loop() {
     Serial.print(ec_adc); Serial.print(",");
     Serial.print(ec_adc_adjusted);
     Serial.println();
-  }*/
+  }
   
   if (loopmillis>last_check+2000) {  //check values
   
@@ -161,7 +169,9 @@ void loop() {
     }
     
 
-    digitalWrite(PIN_LED,valueError);
+    if (!eccalibrationoutput) {
+      digitalWrite(PIN_LED,valueError);
+    }