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.
