Hi, Karen

1) Go here :

http://www.maxim-ic.com/products/ibu...tmex/index.cfm

download the soft corresp. to you system ...

2) Download the dS2480 Datasheet ... and get one or two of them ( think to the SAMPLES !!! )

3) Give me a PM mail where I can send you the Scheme, PCB and parts placement.

OR

Build THAT ...

http://www.elektor.de/jahrgang/2008/...e.497315.lynkx

You'll be able to read the Device IDs ...

OR

Just read your Datasheet ...

READ ROM [33h]
This command can only be used when there is one slave on the bus. It allows the bus master to read the
slave’s 64-bit ROM code without using the Search ROM procedure. If this command is used when there
is more than one slave present on the bus, a data collision will occur when all the slaves attempt to
respond at the same time.

64-BIT LASERED ROM CODE
Each DS18B20 contains a unique 64–bit code (see Figure 6) stored in ROM. The least significant 8 bits
of the ROM code contain the DS18B20’s 1-Wire family code: 28h. The next 48 bits contain a unique
serial number. The most significant 8 bits contain a cyclic redundancy check (CRC) byte that is
calculated from the first 56 bits of the ROM code. A detailed explanation of the CRC bits is provided in
the CRC GENERATION section. The 64-bit ROM code and associated ROM function control logic allow
the DS18B20 to operate as a 1-Wire device using the protocol detailed in the 1-WIRE BUS SYSTEM
section of this datasheet.
64-BIT LASERED ROM CODE Figure 6
8-BIT CRC 48-BIT SERIAL NUMBER 8-BIT FAMILY CODE (28h)
MSB LSB MSB LSB MSB LSB
and buid a little application just to read the ID ...

Something more ???

Alain