hydroponic-controller/include/ec.h

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#ifndef _EC_H_
#define _EC_H_
#include <Arduino.h>
bool ec_flag_measurement_available=false;
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#define EC_PIN_RELAY_PROBE 27
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//#define EC_PIN_ADC 4
#define EC_ADS_CHANNEL 0
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#define EC_PIN_FREQ 5
#define EC_PWM_CH 0
#define EC_RESOLUTION 8
#define EC_FREQUENCY 5000
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#define EC_CALIB_ARRAY_SIZE 64
uint16_t ec_calib_array[EC_CALIB_ARRAY_SIZE];
uint16_t ec_calib_array_pos=0;
#define EC_CALIB_READ_INTERVAL 100 //interval of reading adc value inside a measurement
#define EC_ARRAY_SIZE 64
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uint16_t ec_array[EC_ARRAY_SIZE];
uint16_t ec_array_pos=EC_ARRAY_SIZE;
unsigned long last_measurement_ec=0;
#define EC_MEASUREMENT_INTERVAL 10000 //complete filtered measurement every x ms
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//One filtered measurement takes EC_READ_INTERVAL*EC_ARRAY_SIZE*4
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#define EC_READ_INTERVAL 5 //interval of reading adc value inside a measurement
#define EC_RELAY_SWITCH_SETTLETIME 500 //time until voltage of ec circuit has settled
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const uint16_t ec_centerADCvalue=1909; //adc value when probe resistance is equal to the range resistor (mean of both)
unsigned long ec_last_change_relay=0; //millis of last relay change
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enum ECState{IDLE,MEASURE};
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ECState ecstate=IDLE;
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float ec_adc;
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float ec_adc_adjusted; //adjusted for reference resistor
float ec_calib_adc;
float ec_reference_adc=5889; //adc reference value for the calibration resistor measurement
bool ec_measurementReady();
void ec_startMeasurement();
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void ec_setRange(uint8_t range);
void ec_connectProbe(bool);
void ec_releaseRelay();
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void ec_setup() {
ledcSetup(EC_PWM_CH, EC_FREQUENCY, EC_RESOLUTION);
ledcAttachPin(EC_PIN_FREQ, EC_PWM_CH);
ledcWrite(EC_PWM_CH, 127); //50% duty cycle
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pinMode(EC_PIN_RELAY_PROBE,OUTPUT); //LOW=Calibration/idle, HIGH=Probe connected
ec_releaseRelay();
}
void ec_loop(unsigned long loopmillis) {
static unsigned long last_read_ec=0;
switch (ecstate) {
case IDLE:
if (loopmillis>last_measurement_ec+EC_MEASUREMENT_INTERVAL && ecstate==IDLE) { //start measurement if idle
last_measurement_ec=loopmillis;
ec_startMeasurement();
ec_connectProbe(true);
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Serial.println("Measuring EC");
ecstate=MEASURE;
}
break;
case MEASURE:
if (ec_measurementReady()) {
ec_releaseRelay();
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Serial.println("Finished EC");
ec_adc=getMean(ec_array,EC_ARRAY_SIZE);
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if (isValueArrayOK(ec_calib_array,EC_CALIB_ARRAY_SIZE,0)){
ec_calib_adc=getMean(ec_calib_array,EC_CALIB_ARRAY_SIZE);
ec_adc_adjusted=mapf(ec_adc,0,ec_calib_adc,0,ec_reference_adc);
}
ec_flag_measurement_available=true;
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ecstate=IDLE;
}
break;
}
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if (ec_array_pos<EC_ARRAY_SIZE) { //measurement running
if (loopmillis>last_read_ec+EC_READ_INTERVAL) { //take reading into array
last_read_ec=loopmillis;
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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;
ec_array_pos++;
}
}
}else{ //measurement not running, then take calibration readings
if (loopmillis>last_read_ec+EC_CALIB_READ_INTERVAL) { //take reading into array
last_read_ec=loopmillis;
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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;
ec_calib_array_pos++;
ec_calib_array_pos%=EC_CALIB_ARRAY_SIZE;
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}
}
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}
}
void ec_startMeasurement() {
ec_array_pos=0;
}
bool ec_measurementReady(){
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if (ec_array_pos>=EC_ARRAY_SIZE) { //reached end of both arrays
return true;
}else{
return false;
}
}
void ec_connectProbe(bool relay) {
bool val=digitalRead(EC_PIN_RELAY_PROBE);
if (val!=relay) { //write only if different
digitalWrite(EC_PIN_RELAY_PROBE,relay);
ec_last_change_relay=millis();
}
}
void ec_releaseRelay() {
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digitalWrite(EC_PIN_RELAY_PROBE,LOW);
ec_last_change_relay=millis();
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}
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#endif