Regarding the earlier thread about buying from cheaper sources...
I got five DS18B20 temperature sensors from eBay a year or two ago and finally got around to using them today. Each device is supposed to have a unique 64-bit (8 byte) ID. And these do, but of the 8 bytes they all have 5 bytes in common. And, more importantly, they all register a temperature that is several degrees F higher than two known good temperature sensors (everything within a couple inches of each other).
Just say no.
I got five DS18B20 temperature sensors from eBay a year or two ago and finally got around to using them today. Each device is supposed to have a unique 64-bit (8 byte) ID. And these do, but of the 8 bytes they all have 5 bytes in common. And, more importantly, they all register a temperature that is several degrees F higher than two known good temperature sensors (everything within a couple inches of each other).
Just say no.