Arduino v příkladech - XII. díl - Displej a měření teploty poprvé

// Include the libraries we need
#include <OneWire.h>
#include <DallasTemperature.h>

// Data wire is plugged into port 2 on the Arduino
#define ONE_WIRE_BUS 2

// 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);

// arrays to hold device address
DeviceAddress insideThermometer;

/* * Setup function. Here we do the basics */
void setup(void)
{
  // start serial port
  Serial.begin(9600);
  Serial.println("Dallas Temperature IC Control Library Demo");

  // locate devices on the bus
  Serial.print("Locating devices...");
  sensors.begin();
  Serial.print("Found ");
  Serial.print(sensors.getDeviceCount(), DEC);
  Serial.println(" devices.");

  // report parasite power requirements
  Serial.print("Parasite power is: ");
  if (sensors.isParasitePowerMode()) Serial.println("ON");
  else Serial.println("OFF");
  
  // 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)
  // Note that you will need to use your specific address here
  //insideThermometer = { 0x28, 0x1D, 0x39, 0x31, 0x2, 0x0, 0x0, 0xF0 };

  // Method 1:
  // Search for devices on the bus and assign based on an index. Ideally,
  // you would do this to initially discover addresses on the bus and then
  // use those addresses and manually assign them (see above) once you know
  // the devices on your bus (and assuming they don't change).
  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");

  // show the addresses we found on the bus
  Serial.print("Device 0 Address: ");
  printAddress(insideThermometer);
  Serial.println();

  // set the resolution to 9 bit (Each Dallas/Maxim device is capable of several different resolutions)
  sensors.setResolution(insideThermometer, 9);
 
  Serial.print("Device 0 Resolution: ");
  Serial.print(sensors.getResolution(insideThermometer), DEC);
  Serial.println();
}

// function to print the temperature for a device
void printTemperature(DeviceAddress deviceAddress)
{
  // method 1 - slower
  //Serial.print("Temp C: ");
  //Serial.print(sensors.getTempC(deviceAddress));
  //Serial.print(" Temp F: ");
  //Serial.print(sensors.getTempF(deviceAddress)); // Makes a second call to getTempC and then converts to Fahrenheit

  // method 2 - faster
  float tempC = sensors.getTempC(deviceAddress);
  Serial.print("Temp C: ");
  Serial.print(tempC);
  Serial.print(" Temp F: ");
  Serial.println(DallasTemperature::toFahrenheit(tempC)); // Converts tempC to Fahrenheit
}
/* * Main function. It will request the tempC from the sensors and display on Serial. */
void loop(void)
{
  // call sensors.requestTemperatures() to issue a global temperature
  // request to all devices on the bus
  Serial.print("Requesting temperatures...");
  sensors.requestTemperatures(); // Send the command to get temperatures
  Serial.println("DONE");
  
  // It responds almost immediately. Let's print out the data
  printTemperature(insideThermometer); // Use a simple function to print out the data
}

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

//------------------------------------------------------------------
// inicializace zakladnich knihoven
#include <OneWire.h> // knihovna pro komunikaci 1-wire
#include <EEPROM.h> // knihovna pro zapis do pameti eeprom
//------------------------------------------------------------------
// nastaveni nazvu pinu
#define DS_18B20          3 // vstup pro cidla DS 18B20
//------------------------------------------------------------------
// pocet cidel
#define numberOfSensors   8 // maximalni pocet cidel DS 18B20
//------------------------------------------------------------------
// Nastaveni komunikace cidel DS 18B20
OneWire ds18B20(DS_18B20); // nastaveni komunikace cidel po sbernici oneWire
//------------------------------------------------------------------
// promenne teploty
float teplota[numberOfSensors];
unsigned long casCteniTeplot; // cas posledniho cteni
boolean povolCteniTeplot = false;
byte ID_teploty; // ID pro aktualizaci teploty v pripade nastaveni teplot
unsigned long prodlevaCteniTeplot = 5000; // nastaveni periody cteni teploty
byte resolutionDS = 12; // nastaveni rozliseni cidla
//------------------------------------------------------------------
// pole adres cidel DS 18B20 - 8 pozic dalsi volna adresa 624
//const int cidlaDS_i[] = {560, 568, 576, 584, 592, 600, 608, 616};
const int cidlaDS_i = 560; // prvni adresa EEPROM pro zapis adres cidel
//------------------------------------------------------------------
void setup() {
  //------------------------------------------------------------------
  Serial.begin(9600); // seriova komunikace
  //------------------------------------------------------------------
  // vyhleda a ulozi adresy teplotnich cidel
  hledaniDS18B20(); // vyhleda a ulozi adresy teplotnich cidel
}
//------------------------------------------------------------------
void loop() {
  //------------------------------------------------------------------
  // cast programu pro cteni teplot
  if (!povolCteniTeplot) { // kdyz je zakazano cteni teplot
    if ((unsigned long)(millis() - casCteniTeplot) >= prodlevaCteniTeplot) { // cekej na uplynuti prodlevz
      spustKonverzi();
    }
  }
  else { // jinak je povoleno cteni teplot
    if (ds18B20.read()) { // zkontroluj zda jsou data k dispozici
      cteniTeplot(); // precist hodnoty cidel teploty
    }
  }
}
//------------------------------------------------------------------
// cast programu pro cteni teplot
void cteniTeplot() { // precte teploty ulozenych cidel
  byte data[12];
  byte address[8];
  byte count;
  Serial.println(F("Dalsi cteni teploty"));
  Serial.println("Doba konverze: " + (String)(millis() - casCteniTeplot) + " millis");
  ds18B20.depower();
  for (int id = 0; id < numberOfSensors; id++) { // nastav odresu EEPROM cidla
    count = 0;
    for (int i = cidlaDS_i + (id * 8); i < cidlaDS_i + (id * 8) + 8; i++) { // precti adresy
      address[count] = EEPROM.read(i);
      count++;
    }
    ds18B20.reset(); // resetuj nastaveni oneWire
    ds18B20.select(address); // vyber adresu aktualniho cidla
    ds18B20.write(0xBE); // cti zasobnik cidla
    for (int i = 0; i < 9; i++) { // precti prvnich 9 bitu, bez CRC kodu
      data[i] = ds18B20.read();
    }
    if (address[0] == 255 || data[0] == 255) teplota[id] = NULL; // kdyz neni cidlo ulozeno, nebo nejsou data k dispozici
    else {
      uint16_t temp;
      if (resolutionDS == 12) temp = 127; // 12 bit res, 750 ms
      else if (resolutionDS == 11) temp = 95; // 11 bit res, 375 ms
      else if (resolutionDS == 10) temp = 63; // 10 bit res, 187.5 ms
      else temp = 31; // 9 bit res, 93.75 ms
      if (data[4] != temp) { // kdyz neni nastaveno pozadovane rozliseni
        uint16_t tmpResolution;
        tmpResolution = (resolutionDS - 9) * 32;
        ds18B20.reset();
        ds18B20.select(address);
        ds18B20.write(0x4E);         // zapis do zasobniku
        ds18B20.write(0x00);            // TL
        ds18B20.write(0x00);            // TH
        ds18B20.write(tmpResolution);         // Nastav nove rozliseni
        ds18B20.write(0x48);         // kopiruj zasobnik
        ds18B20.reset();
      }
      int16_t raw = (data[1] << 8) | data[0];
      Serial.print("RAW: " + String(raw) + " ");
      teplota[id] = (float)raw / 16;
      Serial.print("Cidlo " + (String)(id + 1) + ": ");
      Serial.print(teplota[id], 4);
      Serial.println(" C");
    }
  }
  povolCteniTeplot = false;
  Serial.println();
}
//------------------------------------------------------------------
// konverze teplot cidel
void spustKonverzi() {
  casCteniTeplot = millis(); // nastav novy cas cteni
  ds18B20.reset(); // resetuj nastaveni oneWire
  ds18B20.write(0xCC); // nastav konverzi pro vsechny cidla
  ds18B20.write(0x44); // start interni konverze teploty
  povolCteniTeplot = true;
}
//------------------------------------------------------------------
// hleda adresy teplotnich cidel DS 18B20

void hledaniDS18B20() {
  byte address[8];
  byte id;
  ds18B20.reset_search(); // resetuj hledani
  if (ds18B20.search(address)) { // hledej adresy
    for (id = 0; id < numberOfSensors; id++) { // zapis data do displeje
      String stringText;
      for (byte i = 0; i < 8; i++) { // precti a uloz adresy
        EEPROM.write(cidlaDS_i + (id * 8) + i, address[i]);
        stringText += address[i], DEC;
        if (i < 8 - 1) stringText += ",";
      }
      Serial.println("Cidlo " + (String)(id + 1) + ": " + stringText);
      if (!ds18B20.search(address)) {
        ds18B20.reset_search();
        Serial.println(F("Zadne dalsi cidlo nenalezeno"));
        break;
      }
    }
    Serial.println("Nalezeno " + (String)(id + 1) + " cidel.");
    Serial.println();
  }
}