• Arduino
• ScetchTempDigiReadMultiOneWireSensors

One wire

• 20111218 - Needed to read multiple DS18B20 Temperature sensors
• Define Known sensors with names, it will also find the rest.

#include <OneWire.h>
#include <DallasTemperature.h>
// Data wire is plugged into port 2 on the Arduino
#define ONE_WIRE_BUS 10
#define TEMPERATURE_PRECISION 9
// 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);
typedef struct  {
    char name[20+1];
    DeviceAddress Address;
    byte found; //
    } Thermometer_type; // Thermometer;

int ThermometerCount = 2;  // Set to predefined number, add discovered here, after fixed.
Thermometer_type Thermometers[8];
Thermometer_type ThermometersStatic[]= {
      "1st Pool temp in" , { 0x28, 0x71, 0x48, 0x57, 0x3, 0x0, 0x0, 0xDC } , false ,
      "2nd Pool temp out" ,{ 0x28, 0xFB, 0x4A, 0x57, 0x3, 0x0, 0x0, 0x7A } , false
       }; // arrays to hold device addresses

void setup(void)
{
  // start serial port
  Serial.begin(9600);
  delay(5000);
  setupTherm();
};
void loop(void)
{
  loopTerm();
}
void setupTherm(void)
{
  Serial.println("Dallas Temperature IC Control Library Demo");
  //strcpy (Thermometers[0].name , "Test" );


  // Start up the library
  Serial.print("Locating devices...");
  sensors.begin();
  ThermometerCount = sensors.getDeviceCount();
  // locate devices on the bus  
  Serial.print("Found ");
  Serial.print(ThermometerCount);
  Serial.println(" devices.");
  delay(2000);
  // report parasite power requirements
  Serial.print("Parasite power is: "); 
  if (sensors.isParasitePowerMode()) Serial.println("ON");
  else Serial.println("OFF");
  //PES
  for (int i=0 ; i < ThermometerCount ; i++) {
    Thermometers[i].found = false;
    if (!sensors.getAddress(Thermometers[i].Address, i)) {
      Serial.print("Unable to find address for Device ");Serial.println(i);
      //ThermometerCount = i;
      delay(5000);
    }
    else {
      strcpy(Thermometers[i].name , "No Named defined.");
      boolean found; //start true and test each byte
      for (int ii = 0; ii < (sizeof(ThermometersStatic)/sizeof(Thermometer_type)); ii++) {
        found = true;
        for ( int iii = 0; iii < 8; iii++ ) { 
          found = found && (ThermometersStatic[ii].Address[iii] == Thermometers[i].Address[iii] ); 
        };
        if (found) {
          strcpy(Thermometers[i].name , ThermometersStatic[ii].name);
          Thermometers[i].found = true; //start true and test each byte
        };
      };
      Serial.print("Device "); Serial.print(i);Serial.print(" Address: ");
      printAddress(Thermometers[i].Address);
      Serial.print(" ");
      sensors.setResolution(Thermometers[i].Address, TEMPERATURE_PRECISION);
      Serial.print(" Resolution: ");Serial.print(TEMPERATURE_PRECISION);
      if (Thermometers[i].found) { Serial.print(" FOUND MATCH!"); };
      Serial.print(" ");
      Serial.print(Thermometers[i].name);
      Serial.println();
    }
  }
  delay(5000);
  // assign address manually.  the addresses below will beed to be changed
  // to valid device addresses on your bus.  device address can be retrieved
  // by using either oneWire.search(deviceAddress) or individually via
  // sensors.getAddress(deviceAddress, index)
  //insideThermometer = { 0x28, 0x1D, 0x39, 0x31, 0x2, 0x0, 0x0, 0xF0 };
  //outsideThermometer   = { 0x28, 0x3F, 0x1C, 0x31, 0x2, 0x0, 0x0, 0x2 };
  // 
  // method 1: by index
  ////if (!sensors.getAddress(insideThermometer, 0)) Serial.println("Unable to find address for Device 0"); 


  // method 2: search()
  // search() looks for the next device. Returns 1 if a new address has been
  // returned. A zero might mean that the bus is shorted, there are no devices, 
  // or you have already retrieved all of them.  It might be a good idea to 
  // check the CRC to make sure you didn't get garbage.  The order is 
  // deterministic. You will always get the same devices in the same order
  //
  // Must be called before search()
  //oneWire.reset_search();
  // assigns the first address found to insideThermometer
  //if (!oneWire.search(insideThermometer)) Serial.println("Unable to find address for insideThermometer");
  // assigns the seconds address found to outsideThermometer
  //if (!oneWire.search(outsideThermometer)) Serial.println("Unable to find address for outsideThermometer");

  // show the addresses we found on the bus

  // set the resolution to 9 bit

}

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

// function to print the temperature for a device
void printTemperature(DeviceAddress deviceAddress)
{
  float tempC = sensors.getTempC(deviceAddress);
  Serial.print("Temp C: ");
  Serial.print(tempC);
}

// function to print a device's resolution
void printResolution(DeviceAddress deviceAddress)
{
  Serial.print("Resolution: ");
  Serial.print(sensors.getResolution(deviceAddress));
  Serial.println();    
}

// main function to print information about a device
void printData(DeviceAddress deviceAddress,char* name)
{
  Serial.print("Device Address: ");
  printAddress(deviceAddress);
  Serial.print(" ");
  printTemperature(deviceAddress);
  Serial.print(" ");
  Serial.print(name);
  Serial.println();
}

void loopTerm(void)
{ 
  // call sensors.requestTemperatures() to issue a global temperature 
  // request to all devices on the bus
  Serial.print("Requesting temperatures...");
  sensors.requestTemperatures();
  Serial.println("DONE");

  // print the device information
  for (int i=0 ; i < ThermometerCount ; i++) {
    printData(Thermometers[i].Address , Thermometers[i].name );
    }
 
}

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CategoryElectronics