167 lines
4.1 KiB
C
167 lines
4.1 KiB
C
#ifndef _EC_H_
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#define _EC_H_
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#include <Arduino.h>
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#define EC_PIN_RELAY_PROBE 27
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#define EC_PIN_RELAY_RANGE 25
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#define EC_PIN_ADC 4
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#define EC_PIN_FREQ 5
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#define EC_PWM_CH 0
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#define EC_RESOLUTION 8
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#define EC_FREQUENCY 5000
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#define EC_ARRAY_SIZE 128
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uint16_t ec_array_rangeLow[EC_ARRAY_SIZE];
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uint16_t ec_array_rangeHigh[EC_ARRAY_SIZE];
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uint16_t ec_array_pos=EC_ARRAY_SIZE*2;
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#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*2
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#define EC_READ_INTERVAL 5 //interval of reading adc value inside a measurement
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#define EC_RELAY_SWITCH_SETTLETIME 500 //time until voltage of ec circuit has settled
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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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bool ec_measurementReady();
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void ec_startMeasurement();
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void ec_setRange(bool);
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void ec_connectProbe(bool);
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void ec_releaseRelay();
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void ec_setup() {
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pinMode(EC_PIN_ADC,INPUT);
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ledcSetup(EC_PWM_CH, EC_FREQUENCY, EC_RESOLUTION);
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ledcAttachPin(EC_PIN_FREQ, EC_PWM_CH);
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ledcWrite(EC_PWM_CH, 127); //50% duty cycle
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pinMode(EC_PIN_RELAY_PROBE,OUTPUT); //LOW=Calibration/idle, HIGH=Probe connected
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pinMode(EC_PIN_RELAY_RANGE,OUTPUT); //LOW=NC Range Resistor, HIGH=NO Range Resistor
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ec_releaseRelay();
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}
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void ec_loop(unsigned long loopmillis) {
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static unsigned long last_measurement_ec=0;
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static unsigned long last_read_ec=0;
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switch (ecstate) {
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case IDLE:
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if (loopmillis>last_measurement_ec+EC_MEASUREMENT_INTERVAL && ecstate==IDLE) { //start measurement if idle
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last_measurement_ec=loopmillis;
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ec_startMeasurement();
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ec_connectProbe(true);
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ecstate=MEASURE;
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Serial.println("EC Take Measurement");
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}
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break;
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case MEASURE:
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if (ec_measurementReady()) {
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ec_releaseRelay();
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float adc_rangelow=getMean(ec_array_rangeLow,EC_ARRAY_SIZE);
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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);
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ecstate=IDLE;
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}
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break;
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}
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if (loopmillis>last_read_ec+EC_READ_INTERVAL && ec_array_pos/2<EC_ARRAY_SIZE) { //take reading into array if measurement running
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last_read_ec=loopmillis;
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//flag_print= ec_array_pos==EC_ARRAY_SIZE;
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//ec_array_pos%=EC_ARRAY_SIZE;
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if (ec_array_pos<EC_ARRAY_SIZE){ //low range
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ec_setRange(LOW);
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}else{ //high range
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ec_setRange(HIGH);
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}
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if (loopmillis>ec_last_change_relay+EC_RELAY_SWITCH_SETTLETIME) { //values have settled
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uint16_t value=analogRead(EC_PIN_ADC);
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if (ec_array_pos<EC_ARRAY_SIZE){ //low range
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ec_array_rangeLow[ec_array_pos%EC_ARRAY_SIZE]=value;
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}else{ //high range
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ec_array_rangeHigh[ec_array_pos%EC_ARRAY_SIZE]=value;
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}
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/*
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if (ec_array_pos==0) {
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Serial.println(""); Serial.print("Lowrange:");
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}
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if (ec_array_pos==EC_ARRAY_SIZE) {
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Serial.println(""); Serial.print("Highrange:");
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}
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Serial.print(value); Serial.print(" ");
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if (ec_array_pos==EC_ARRAY_SIZE*2-1) {
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Serial.println("");
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}
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*/
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ec_array_pos++;
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}
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}
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}
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void ec_startMeasurement() {
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ec_array_pos=0;
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}
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bool ec_measurementReady(){
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if (ec_array_pos>=EC_ARRAY_SIZE*2) { //reached end of both arrays
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return true;
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}else{
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return false;
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}
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}
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void ec_setRange(bool range) {
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//range low means low resistor value -> NO -> relay High
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bool val=digitalRead(EC_PIN_RELAY_RANGE);
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if (val!=!range) { //write only if different
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digitalWrite(EC_PIN_RELAY_RANGE,!range);
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ec_last_change_relay=millis();
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}
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}
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void ec_connectProbe(bool relay) {
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bool val=digitalRead(EC_PIN_RELAY_PROBE);
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if (val!=relay) { //write only if different
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digitalWrite(EC_PIN_RELAY_PROBE,relay);
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ec_last_change_relay=millis();
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}
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}
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void ec_releaseRelay() {
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digitalWrite(EC_PIN_RELAY_PROBE,LOW);
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digitalWrite(EC_PIN_RELAY_RANGE,LOW);
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ec_last_change_relay=millis();
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}
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#endif |