Arduino sample code:
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();
}
