Connect the signal to Arduino digital 10, and open serial port monitor:







#include

 

/* DS18S20 Temperature chip i/o

 

 */

 

OneWire ds(10); // on pin 10

 

void setup(void) {

 // initialize inputs/outputs

 // start serial port

 Serial.begin(9600);

}

 

 

 

void loop(void) {

 byte i;

 byte present = 0;

 byte data[12];

 byte addr[8];

 int Temp;

 if ( !ds.search(addr)) {

      //Serial.print("No more addresses.n");

      ds.reset_search();

      return;

 }

 

 Serial.print("R="); //R=28 Not sure what this is

 for( i = 0; i < 8; i++) {

   Serial.print(addr[i], HEX);

   Serial.print(" ");

 }

 

 if ( OneWire::crc8( addr, 7) != addr[7]) {

      Serial.print("CRC is not valid!n");

      return;

 }

 

 if ( addr[0] != 0x28) {

      Serial.print("Device is not a DS18S20 family device.n");

      return;

 }

 

 ds.reset();

 ds.select(addr);

 ds.write(0x44,1);        // start conversion, with parasite power on at the end

 

 delay(1000);    // 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

 

 Serial.print("P=");

 Serial.print(present,HEX);

 Serial.print(" ");

 for ( i = 0; i < 9; i++) {        // we need 9 bytes

   data[i] = ds.read();

   Serial.print(data[i], HEX);

   Serial.print(" ");

 }

 Temp=(data[1]<<8)+data[0];//take the two bytes from the response relating to temperature

 

 Temp=Temp>>4;//divide by 16 to get pure celcius readout

 

  //next line is Fahrenheit conversion

 Temp=Temp*1.8+32; // comment this line out to get celcius

 

 Serial.print("T=");//output the temperature to serial port

 Serial.print(Temp);

   Serial.print(" ");

 

 

 Serial.print(" CRC=");

 Serial.print( OneWire::crc8( data, 8), HEX);

 Serial.println();

}