Source Code Heizungs-Logger II

#include <Ethernet.h>
#include <SPI.h>
#include <OneWire.h>

// HZSteuerung
OneWire  ds(20);  // on pin 20 (a 4.7K resistor is necessary)

// the media access control (ethernet hardware) address for the shield:
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
byte ip[] = { 192, 168, 12, 118 };  
  
EthernetClient client;
int    HTTPPORT   = 80;
String HTTPMETHOD = "GET";
char   HOSTNAME[] = "192.168.12.117"; 
String PATHNAME   = "/hzcontroller/ds18.php";

void setup() {
  Serial.begin(9600);
  Serial.println("Starting ....");
  Ethernet.begin(mac, ip);
}

char *ftoa(char *a, double f, int precision)
{
  long p[] = {0,10,100,1000,10000,100000,1000000,10000000,100000000};
  char *ret = a;
  long heiltal = (long)f;
  itoa(heiltal, a, 10);
  while (*a != '\0') a++;
  *a++ = '.';
  long desimal = abs((long)((f - heiltal) * p[precision]));
  itoa(desimal, a, 10);
  return ret;
}

int HZLoggerLoop() {
  byte i;
  byte present = 0;
  byte type_s;
  byte data[12];
  byte addr[8];
  float celsius;
  char address[20];
  char temperature[20];

  if ( !ds.search(addr)) {
    //Serial.print("No more addresses.");
    ds.reset_search();
    return 1;
  }
  
  for( i = 0; i < 8; i++) {
    sprintf(address+(i*2),"%2.2X",addr[i]);
  }

  if (OneWire::crc8(addr, 7) != addr[7]) {
      Serial.println("CRC is not valid!");
      return 2;
  }
 
  // the first ROM byte indicates which chip
  switch (addr[0]) {
    case 0x10:
      //Serial.println("  Chip = DS18S20");  // or old DS1820
      type_s = 1;
      break;
    case 0x28:
      //Serial.println("  Chip = DS18B20");
      type_s = 0;
      break;
    case 0x22:
      //Serial.println("  Chip = DS1822");
      type_s = 0;
      break;
    default:
      Serial.println("Device is not a DS18x20 family device.");
      return 2;
  } 

  ds.reset();
  ds.select(addr);
  ds.write(0x44, 1);        // start conversion, with parasite power on at the end
  
  delay(750);     // maybe 750ms is enough, maybe not
  // we might do a ds.depower() here, but the reset will take care of it.
  
  present = ds.reset();
  ds.select(addr);    
  ds.write(0xBE);         // Read Scratchpad

  for ( i = 0; i < 9; i++) {           // we need 9 bytes
    data[i] = ds.read();
  }

  // Convert the data to actual temperature
  // because the result is a 16 bit signed integer, it should
  // be stored to an "int16_t" type, which is always 16 bits
  // even when compiled on a 32 bit processor.
  int16_t raw = (data[1] << 8) | data[0];
  if (type_s) {
    raw = raw << 3; // 9 bit resolution default
    if (data[7] == 0x10) {
      // "count remain" gives full 12 bit resolution
      raw = (raw & 0xFFF0) + 12 - data[6];
    }
  } else {
    byte cfg = (data[4] & 0x60);
    // at lower res, the low bits are undefined, so let's zero them
    if (cfg == 0x00) raw = raw & ~7;  // 9 bit resolution, 93.75 ms
    else if (cfg == 0x20) raw = raw & ~3; // 10 bit res, 187.5 ms
    else if (cfg == 0x40) raw = raw & ~1; // 11 bit res, 375 ms
    //// default is 12 bit resolution, 750 ms conversion time
  }
  celsius = (float)raw / 16.0;
  ftoa(temperature,celsius,2);
  
  String queryString = "?s=" + String(address) + "&t=" + String(temperature);
  if(client.connect(HOSTNAME, HTTPPORT)) {
    //if connected make a HTTP request send HTTP header
    client.println(HTTPMETHOD + " " + PATHNAME + queryString + " HTTP/1.1");
    client.println("Host: " + String(HOSTNAME));
    client.println("Connection: close");
    client.println(); // end HTTP header

    while(client.connected()) {
      if(client.available()){
        // read an incoming byte from the server and print it to serial monitor:
        char c = client.read();
      }  
    }
    // the server's disconnected, stop the client:
    client.stop();
  } else {// if not connected:
    Serial.println("connection failed");
  }  
 return 0;    
}

void loop(void) {
  if (HZLoggerLoop() == 1)
    delay(60000);
}