hydroponic-controller/include/ec.h

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#ifndef _EC_H_
#define _EC_H_
#include <Arduino.h>
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#define EC_PIN_RELAY_PROBE 27
#define EC_PIN_RELAY_RANGE 25
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#define EC_PIN_ADC 4
#define EC_PIN_FREQ 5
#define EC_PWM_CH 0
#define EC_RESOLUTION 8
#define EC_FREQUENCY 5000
#define EC_ARRAY_SIZE 128
uint16_t ec_array_rangeLow[EC_ARRAY_SIZE];
uint16_t ec_array_rangeHigh[EC_ARRAY_SIZE];
uint16_t ec_array_pos=EC_ARRAY_SIZE*2;
#define EC_MEASUREMENT_INTERVAL 10000 //complete filtered measurement every x ms
//One filtered measurement takes EC_READ_INTERVAL*EC_ARRAY_SIZE*2
#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
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;
bool ec_measurementReady();
void ec_startMeasurement();
void ec_setRange(bool);
void ec_connectProbe(bool);
void ec_releaseRelay();
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void ec_setup() {
pinMode(EC_PIN_ADC,INPUT);
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
pinMode(EC_PIN_RELAY_RANGE,OUTPUT); //LOW=NC Range Resistor, HIGH=NO Range Resistor
ec_releaseRelay();
}
void ec_loop(unsigned long loopmillis) {
static unsigned long last_measurement_ec=0;
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);
ecstate=MEASURE;
Serial.println("EC Take Measurement");
}
break;
case MEASURE:
if (ec_measurementReady()) {
ec_releaseRelay();
float adc_rangelow=getMean(ec_array_rangeLow,EC_ARRAY_SIZE);
float adc_rangehigh=getMean(ec_array_rangeHigh,EC_ARRAY_SIZE);
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Serial.print("EC ADC: Low="); Serial.print(adc_rangelow); Serial.print(" High="); Serial.println(adc_rangehigh);
ecstate=IDLE;
}
break;
}
if (loopmillis>last_read_ec+EC_READ_INTERVAL && ec_array_pos/2<EC_ARRAY_SIZE) { //take reading into array if measurement running
last_read_ec=loopmillis;
//flag_print= ec_array_pos==EC_ARRAY_SIZE;
//ec_array_pos%=EC_ARRAY_SIZE;
if (ec_array_pos<EC_ARRAY_SIZE){ //low range
ec_setRange(LOW);
}else{ //high range
ec_setRange(HIGH);
}
if (loopmillis>ec_last_change_relay+EC_RELAY_SWITCH_SETTLETIME) { //values have settled
uint16_t value=analogRead(EC_PIN_ADC);
if (ec_array_pos<EC_ARRAY_SIZE){ //low range
ec_array_rangeLow[ec_array_pos%EC_ARRAY_SIZE]=value;
}else{ //high range
ec_array_rangeHigh[ec_array_pos%EC_ARRAY_SIZE]=value;
}
/*
if (ec_array_pos==0) {
Serial.println(""); Serial.print("Lowrange:");
}
if (ec_array_pos==EC_ARRAY_SIZE) {
Serial.println(""); Serial.print("Highrange:");
}
Serial.print(value); Serial.print(" ");
if (ec_array_pos==EC_ARRAY_SIZE*2-1) {
Serial.println("");
}
*/
ec_array_pos++;
}
}
}
void ec_startMeasurement() {
ec_array_pos=0;
}
bool ec_measurementReady(){
if (ec_array_pos>=EC_ARRAY_SIZE*2) { //reached end of both arrays
return true;
}else{
return false;
}
}
void ec_setRange(bool range) {
//range low means low resistor value -> NO -> relay High
bool val=digitalRead(EC_PIN_RELAY_RANGE);
if (val!=!range) { //write only if different
digitalWrite(EC_PIN_RELAY_RANGE,!range);
ec_last_change_relay=millis();
}
}
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);
digitalWrite(EC_PIN_RELAY_RANGE,LOW);
ec_last_change_relay=millis();
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}
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#endif