DS18B20 ID saving To and Reading From EEPROM

[Acetronics2]

So suppose I want to make indoor/ outdoor thermometers for all my family and friends as gifts. I'll have 2 DS18B20's on a bus in the design. How do I resolve which is the indoor one and which is the outdoor one?

I do not see other method than reading the sensors ID and addressing them by their ID ...

but have to reprogram the chips if you change the sensor

the clever methods here are...

1) to use two ports instead of only one !!!

2) to have a routine that reads ONE sensor ID you have placed alone on the bus and makes it indoor one , then reads the second sensor you place later and make it the outdoor one ...

and so-on if a sensor change should occur one day.

3) use a normal sensor for outside and a ghost supply one for inside : it's possible to recognize them by software ...

Alain