If you use an "interchangeable" NTC like https://br.mouser.com/ProductDetail/US-Sensor/PS103J2 you can skip the calibration part.
Edésio On Thu, Apr 05, 2018 at 09:20:56AM -0400, Bob kb8tq wrote: > Hi > > By far the highest resolution sensor you will come across is a thermistor. It > also has a pretty > narrow range in terms of maintaining high resolution. That???s fine for > something with a target > temperature ( OCXO oven) and not so fine for monitoring outdoor temperature > year round. > > If you want something that is pre-calibrated, then the IC based parts are the > way to go. They > are a much better answer to the ???general purpose sensor???? question. > Mounting them and hooking > up to them ??? errr ???. not quite so easy. > > One basic answer is to buy a bag of cheap thermistors and calibrate them > yourself. They may > have odd curves, but so far the entire bag looks about the same. That???s > been true for a couple > of bags bought randomly here and there. For a lot of things, a simple three > point calibration will > do pretty well. You still need to do a rational curve fit, but even that > isn???t to crazy over limited > ranges. > > Bob > > > On Apr 4, 2018, at 8:58 PM, Mark Sims <hol...@hotmail.com> wrote: > > > > I recently (mostly) finished adding external environmental sensor support > > to Lady Heather. You can use the sensor as the primary "receiver" device > > or in conjunction with any of the "receivers" that Lady Heather supports > > (except currently the HP-5071A which uses the same plot queue entries as > > the environmental sensors). Heather supports humidity, pressure, and two > > temperature values. > > > > I am currently using a dogratian.com USB-PA sensor with temperature, > > humidity, and pressure. I am also designing a Heather specific board > > (BME280, two thernistors, temperature controller interface, maybe a couple > > of ADC channels, etc). Are there any recommendations for other > > off-the-shelf sensors worth looking at? > > > > The main requirement is that the sensor should send data over a serial port > > or virtual serial port or maybe ethernet. Ideally it would stream > > readings at 1 Hz, but a polled device (like the dogratian.com devices) can > > be accomodated. Also, it would be very nice if the temperature sensors > > are small, responsive, and on leads that could be attached to whatever is > > being monitored. > > > > Attached is a screen dump of the USB-PA running. Can you spot the furnace > > cycling and sunrise? > > <enviro.gif>_______________________________________________ > > 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. > > _______________________________________________ > 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. _______________________________________________ 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.
