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:

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@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: > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > -- --Jim Harman