[time-nuts] Environmental sensor recommendations

Jim Harman j99harman at gmail.com
Thu Apr 5 21:09:54 EDT 2018


I would like to put in a good word for the DS18B20 temperature sensor. It
consumes very little power, uses the "1-Wire" protocol, and is available
pre-wired in a variety of configurations, for example this
https://www.adafruit.com/product/381
and this
https://www.adafruit.com/product/642

resolution is 12 bits, .0625 C, range -55 to +125 C.

You can connect a bunch of them in parallel on the same data pin if you
want to measure temperature at different locations

There is a pretty good 1-wire library for the Arduino.

On Thu, Apr 5, 2018 at 7:19 PM, Mark Sims <holrum at hotmail.com> wrote:

> Digital temperature sensors have some advantages (like nice factory
> calibration),  but also so issues.   The IIC/SPI ones need to be mounted to
> a PCB and also have quite a bit of thermal mass.  They also need 4-6 wire
> cables.  They are hard to attach directly to a point that you want to
> monitor.
>
> The advantage of thermistors is that they are small,  cheap, readily
> available with leads attached, and only require a two wire cable.   You can
> easily tape them to whatever point you want to monitor.
>
> The ADT7420 is $8 a pop + PCB + assembly + cable.  Decent thermistors can
> be had for less than a buck.
>
> --------------
>
> >  Check out ADT7420:
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-- 

--Jim Harman



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