hydroponic-controller/include/ec.h

#ifndef _EC_H_
#define _EC_H_

#include <Arduino.h>

#define EC_PIN_RELAY_PROBE 27
#define EC_PIN_RELAY_CALIBRATION 26
#define EC_PIN_RELAY_RANGE 25

#define EC_CALIBRATION_RESISTOR_NC 100000
#define EC_CALIBRATION_RESISTOR_NO 1000


#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 1024
uint16_t ec_array[EC_ARRAY_SIZE];
uint16_t ec_array_pos=0;
unsigned long last_read_ec=0;
#define EC_READ_INTERVAL 1

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);

  pinMode(EC_PIN_RELAY_PROBE,OUTPUT); //LOW=Calibration/idle, HIGH=Probe connected
  pinMode(EC_PIN_RELAY_CALIBRATION,OUTPUT); //LOW=NC Calibration Resistor, HIGH=NO Calib. Res.
  pinMode(EC_PIN_RELAY_RANGE,OUTPUT); //LOW=NC Range Resistor, HIGH=NO Range Resistor
  digitalWrite(EC_PIN_RELAY_PROBE,LOW);
  digitalWrite(EC_PIN_RELAY_CALIBRATION,LOW);
  digitalWrite(EC_PIN_RELAY_RANGE,LOW);
}

void ec_loop(unsigned long loopmillis, unsigned long pInterval) {
  if (loopmillis>last_read_ec+pInterval) {
    last_read_ec=loopmillis;
    ec_array_pos++;
    flag_print= ec_array_pos==EC_ARRAY_SIZE;
    ec_array_pos%=EC_ARRAY_SIZE;
    ec_array[ec_array_pos]=analogRead(EC_PIN_ADC);

    //Serial.print(ec_array[ec_array_pos]); Serial.print(" ");
  }
}

#endif