hydroponic-controller/include/temperature.h

#ifndef _TEMPERATURE_H_
#define _TEMPERATURE_H_


#include <OneWire.h>
#include <DallasTemperature.h>

void printAddress(DeviceAddress deviceAddress);

//first address: 28FF6C1C7216058B
//second address: 

#define ONE_WIRE_BUS 18 //GPIO pin
#define TEMPERATURE_PRECISION 12 //max is 12
#define READINTERVAL_DS18B20 1000 //ms

// Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
OneWire oneWire(ONE_WIRE_BUS);

// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);


#define TEMPMEAN_SIZE 16
uint16_t tempCmean_pos=0;
// arrays to hold device addresses
DeviceAddress thermometerReservoir={0x28,0xFF,0x30,0xBA,0x85,0x16,0x03,0xB5};
float tempC_reservoir;
float tempCmean_reservoir[TEMPMEAN_SIZE];

DeviceAddress thermometerAir={0x28,0xFF,0x6C,0x1C,0x72,0x16,0x05,0x8B};
float tempC_air;
float tempCmean_air[TEMPMEAN_SIZE];


void temperature_setup() {

  //initialize mean array
  for (uint16_t i=0;i<TEMPMEAN_SIZE;i++) {
    tempCmean_reservoir[i]=-127;
    tempCmean_air[i]=-127;
  }

  sensors.begin();
  delay(1000);

  Serial.print("Locating devices...");
  Serial.print("Found ");
  Serial.print(sensors.getDeviceCount(), DEC);
  Serial.println(" devices.");

  delay(1000);

  Serial.print("Parasite power is: ");
  if (sensors.isParasitePowerMode()) Serial.println("ON");
  else Serial.println("OFF");

  delay(1000);


  //Just search for devices. Only needed when connecting a new sensor to find the address
  oneWire.reset_search();
  
  for (uint8_t i=0;i<sensors.getDeviceCount();i++){
    DeviceAddress _addr;
    if (!oneWire.search(_addr)) {
      Serial.print("Error: Device not found");
    }else{
      Serial.print("Found device. Address:");
      printAddress(_addr);
    }
    Serial.println();
      
  }

  sensors.setResolution(thermometerReservoir, TEMPERATURE_PRECISION);
  sensors.setResolution(thermometerAir, TEMPERATURE_PRECISION);
}


void temperature_loop(unsigned long loopmillis) {

  static unsigned long last_read_ds18b20;
  static bool flag_requestTemperatures=false;
  if (loopmillis>last_read_ds18b20+READINTERVAL_DS18B20) { 
    if (loopmillis>last_read_ds18b20+READINTERVAL_DS18B20*10) { //timeout
      Serial.println("Warn: Request Temperatures Timeout!");
      flag_requestTemperatures=false;
    }
    if (!flag_requestTemperatures) {
      sensors.requestTemperatures(); //this takes ~600ms
      flag_requestTemperatures=true;
    }
    if (sensors.isConversionComplete()) {
      flag_requestTemperatures=false;
      last_read_ds18b20=loopmillis;
      
      tempC_reservoir = sensors.getTempC(thermometerReservoir);
      if (tempC_reservoir == DEVICE_DISCONNECTED_C)
      {
        Serial.print(" Error reading: ");  printAddress(thermometerReservoir);
      }else{
        tempCmean_reservoir[tempCmean_pos]=tempC_reservoir;
      }

      tempC_air = sensors.getTempC(thermometerAir);
      if (tempC_air == DEVICE_DISCONNECTED_C)
      {
        Serial.print(" Error reading: ");  printAddress(thermometerReservoir);
      }else{
        tempCmean_air[tempCmean_pos]=tempC_air;
      }

      tempCmean_pos++;
      tempCmean_pos%=TEMPMEAN_SIZE;
    }
    
  }
}


void printAddress(DeviceAddress deviceAddress)
{
  for (uint8_t i = 0; i < 8; i++)
  {
    // zero pad the address if necessary
    if (deviceAddress[i] < 16) Serial.print("0");
    Serial.print(deviceAddress[i], HEX);
  }
}
#endif