I dug up this image of the CR2032 tester with a coin cell inserted.
The coin cell doesn’t have to be inserted completely for the tester to work, which
reduces test time (no need to mess up/bend fingernails prying the battery out too).
The next best thing to add to this design would probably be a plastic non-conductive
ejection system. But i’m not in the business of testing lots of coin cell batteries (yet).
I was able to release a small breakout board based on a sample I received long ago from Texas Instruments.
It is a CR2032 tester, based on the pretty accurate TPS3809L30DBVR part (which was derived
from eevblog’s µCurrent). The LED stops lighting up somewhere slightly at or below 2.64v, where most CR2032 coin cells enter
end-of-life on the discharge curve.
Read more and get it made on the project page.
I’ve been working on some motion sensing stuff and stumbled across Panasonic’s PIR sensors. They’re not raw sensors, but come as a mostly all in one TO-5 package.
Since the package has slender, non-breadboard friendly pins, working with it was quite unwieldy, and required alligator clips (which got tied up in knots, required careful positioning, etc).
So here is a tested breakout board for the Panasonic PIR sensors. All the good bits of information (which sensors have been tested, vendor links, etc) are in the repository’s README (just scroll down).
If you prefer to use OSHPark’s fabrication services for purpleization, a link is included to a shared project. All you need to do is to click order.