DS18B20 ID saving To and Reading From EEPROM

[Charlie]

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?

[Demon]

Wouldn't it be obvious to them which temp was which? lol I don't know where your relatives live, but it's real easy to figure out here in Quebec.

Why burden yourself with labelling the temps? (if that is the reason of the question)

Robert

[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

[Charlie]

I put up my hypothetical question because I'm trying understand why you would ever use the whole serial number. If you want to build something that does not require human intervention on every restart, with multiple sensors and with the ability to swap one out if it fails, you can't use the full serial number as the method. So why would you bother to read anything beyond the family code? (other than academic interest)

[snuff28]

I'm back to try and resolve this. I can not assign each temp sensor (6 of them) a different pin as the motherboard is already produced, I am just trying to improve things a little. So all I need to figure out is how to get an array into the select case:
I have tried:

SELECT CASE sensor
    CASE 1 :LOOKUP hexbyte,[STR sensor1\8], col

but that does not work

In my orginal code I have:

Select Case sensor
        Case 1 :LOOKUP hexbyte,[$28,$1E,$F5,$24,$03,$00,$00,$B8], col

Lets say the array sensor1\8 is $28,$1E,$F5,$24,$03,$00,$00,$B8
Hope this makes sense.

[AvionicsMaster1]

Should lookup have a : before it?