Hi. I am planning to install some temperature sensors around my house using a 1-wire bus. I have found some combined temperature and humidity sensors called DHT11, but I can't find out if they are using 1-wire or not. I would like to use 1-wire in order to be able to daisy chain the sensors instead…

Hello, Silly answer - does it say 1-Wire on it? No. Have a look at Maxim's site for the full list of 1-Wire devices. I have just set up a few DS18B20's on CAT5e cable together with humidity. The ususal route for humidity on 1-Wire is to use something like the Honeywell HIH-4000 series (you will n…

Just a typo Be nice to the last (first) reference should have read "Be nice to the last (and first) reference" A bit more info - I get the 2438's from RS in UK (£5 or less) and the Honeywells from Farnell (£14). I'm only guessing, but if the DH?? device is analogue, then you might need two 2438…

DHT11s are not accurate, I had 5 of them hooked up on a single breadboard and the temperatures they were showing varied from 72 to 77, the RH readings were worse, from 28 to 52. DHT22 may be better ?? but you can't go wrong with DS18B20s.

1-Wire sensors

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DrDiettrich May 19, 2015, 9:26pm 2

You'll need a bunch of digital pins and cables, unless the many sensors are individually adressable. The DS18B20 sensors can be programmed for unique addresses, so that a single data line is sufficient.

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