Ecods18b20.cpp

/*
* EcoSensors
* Library is distributed  WITHOUT WARRANTY
* 
*/

#include "Arduino.h"
#include "Ecods18b20.h"


/*
* You can connect up to 4 DS18B20, either on the same BUS, or a different pin for each of them.
* YOU MUST DEFINE THE Pin number https://learn.adafruit.com/adafruit-feather-m0-adalogger/pinouts
* Expl:
* A0 => 14
* A1 => 15
* A2 => 16
* A3 => 17
* A4 => 18
* A5 => 19
* 
*/

Ecods18b20::Ecods18b20()
{
}

/*
* 1 = READ_OK
* 0 = NO_SENSOR_FOUND
* -1 = INVALID_ADDRESS
* -2 = INVALID_SENSOR
*/
int Ecods18b20::get_temperature(OneWire* ds, float *temperature_soil, bool reset_search)
{
  _wire = ds; // Does it makes sens to do it
  
  //Serial.println(F("Getting temperature"));
  
  delay(500);
  byte data[9], addr[8];
  // data[] : Données lues depuis le scratchpad
  // addr[] : Adresse du module 1-Wire détecté  
  // Reset le bus 1-Wire ci nécessaire (requis pour la lecture du premier capteur)
    
  if (reset_search) {
    _wire->reset_search();
  }
     
  // Recherche le prochain capteur 1-Wire disponible
  if (!_wire->search(addr)) {
    // Pas de capteur
    Serial.println(F("  No sensor found"));
    return 0;
  }
  else
  {
    switch (addr[0])
    {
      case 0x10:
        Serial.println("  Chip = DS18S20");  // or old DS1820
        break;
     	case 0x28:
        Serial.println("  Chip = DS18B20");
        break;
      case 0x22:
        Serial.println("  Chip = DS1822");
        break;
      default:
        Serial.println("  Device is not a DS18x20 family device.");
        return -2;
    } 
  }	

  // Vérifie que l'adresse a été correctement reçue 
  if (OneWire::crc8(addr, 7) != addr[7])
  {
    // Adresse invalide
    Serial.println(F("  Invalid address"));
    return -1;
  }
  
  // Vérifie qu'il s'agit bien d'un DS18B20 
  if (addr[0] != 0x28)
  {
    Serial.println(F("  Invalid sensor"));
    return -2;
  }

  // the first ROM byte indicates which chip
	// Reset le bus 1-Wire et sélectionne le capteur
  _wire->reset();
  _wire->select(addr);
    
  // Lance une prise de mesure de température et attend la fin de la mesure
  _wire->write(0x44, 1);
  delay(800);
    
  // Reset le bus 1-Wire, sélectionne le capteur et envoie une demande de lecture du scratchpad
  _wire->reset();
  _wire->select(addr);
  _wire->write(0xBE);

  // Lecture du scratchpad
  for (byte i = 0; i < 9; i++)
  {
    data[i] = _wire->read();
  }

  // Calcul de la température en degré Celsius 
  *temperature_soil = (int16_t) ((data[1] << 8) | data[0]) * 0.0625;

  // Pas d'erreur
  return 1;
}


float Ecods18b20::corrected(float *temperature, float rawLow, float referenceLow, float rawRange, float referenceRange)
{
  //Return the calculate value following the calibration step
  float correctedValue;

  //RawRange = RawHigh - RawLow
  //ReferenceRange = ReferenceHigh - ReferenceLow

  correctedValue = (((*temperature - rawLow) * referenceRange) / rawRange) + referenceLow;
  return correctedValue;
}


// Not tested yet
void Ecods18b20::scan(byte readPin)
{
  Serial.print(F("# Scan DS18B20 on BUS ")); Serial.println(readPin);
  OneWire ds(readPin);
  int s = 0;

  do{
    byte address[8];
    if (!ds.search(address))
    {
      ds.reset_search();
      _numberOfConnectedSensors = s;
      Serial.print(F("Found "));
      Serial.print(_numberOfConnectedSensors);
      Serial.println(F(" sensor(s)"));
      s=4;  // Leave the loop
    }
    else
    {
      // DS18B20 has been found
      Serial.print(F("Found: "));
      for(byte i = 0; i < 8; ++i)
      {
        if (address[i] < 0x10) Serial.write('0');
        Serial.print(address[i], HEX);
        _sensorsAddr[readPin][s][i]=address[i];             // Save into an array to use it later
        Serial.write(' ');
      }
      
      // Check if the address belong to a DS18B20 
      if (OneWire::crc8(address, 7) != address[7])
      {
        Serial.print(F("(CRC invalid)"));
      }
      else
      {
        switch (address[0])
        {
          case 0x10:
            Serial.println(F("  Chip = DS18S20"));  // or old DS1820
            break;
          case 0x28:
            Serial.println(F("  Chip = DS18B20"));
            break;
          case 0x22:
            Serial.println(F("  Chip = DS1822"));
            break;
          default:
            Serial.println(F(" Unknow sensor!"));
            break;
        }
      }
      s++;
      // END
      //Serial.println();
    }
  }while(s < 4);
}