set up temperature resolution on DS18B20

gistfile1.txt

ds.search(addr); // address on 1wire bus

if (addr[0] == DS18B20)     // check we are really using a DS18B20
{
    ds.reset();             // rest 1-Wire
    ds.select(addr);        // select DS18B20

    ds.write(0x4E);         // write on scratchPad
    ds.write(0x00);         // User byte 0 - Unused
    ds.write(0x00);         // User byte 1 - Unused
    ds.write(0x7F);         // set up en 12 bits (0x7F)

    ds.reset();             // reset 1-Wire
}