cheap ds18b20's, are they legit??

[blume007]

Hey guys and gals,

Although coming from the AVR world, I've found this thread and would like to contribute a little. I've been also a bit worried when buying a pack of 10 DS18B20s from China (aliexpress.com) but after checking most of them, I did have the luck all work just fine. There is a tiny offset among each, but considering the datasheet says about 0.5 deg.C precision, it seems to be quite all right.

Here is what I get from 6 in breadboard neighboring thermometers:
[0] P=1 24.1
[1] P=1 23.9
[2] P=1 24.1
[3] P=1 24.1
[4] P=1 24.1
[5] P=1 24.3
------------------
[] is channel/pin index, P stands for presence indicator and finally, there is the temperature.

Considering the absolute value of 24 deg.C I am not really sure whether we have such T in the office.. and don't have a any other calibrated thermometer and thus I have nothing to compare to. However, comparing to AD's TMP36 T->U converter these are way easier to use. Additionally, I got 10 of them for the price of 2 here in CZ

[mvs_sarma]

encouraging to be back with our site after a long gap

Good that you got 10 and are happy.
i checked ebay to day. some sellers offer 10 at little less than 10$.
However, no point in searching for same , as you bought already. all the best