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pathetic piss kitten @kitten@elizabeth.cat
9mo
kitten playing with trackers okay, so, my tinkering with Bluetooth beacons/trackers begins

I bought a bunch to be able to play around and see which one its holder likes the most
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pathetic piss kitten @kitten@elizabeth.cat
9mo
kitten playing with trackers first contender: nrf51822 (like almost all the boards), with an incorporated SHT30 temperature and humidity sensor, using a CR2032 battery

this one is my favorite for the moment, both because of the neat small form factor, and because the seller provides the pinout for the board... except mine doesn't match any of the ones they provide..but I asked them, see if they can provide it.

a.aliexpress.com/_EJjjOxI
small black PCB with a nrf51822 microcontroller in it and a small button in the center
the board inside its white plastic case, with a blue plastic button, in my hand
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User avatar
pathetic piss kitten @kitten@elizabeth.cat
9mo
kitten playing with trackers the second, another nrf51822, this time by itself, and this time using a CR2477 battery

this one... is not looking good. it's just too big, and that's with half the PCB empty. besides, the case has no way of attaching it to anything

it does have an upside though: I found the datasheet in the internet, with the pinout. not only that, it has 4 available digital I/O pins, which means: potential

a.aliexpress.com/_EHqjtVA

www.holyiot.com/tp/2019042814310092401.pdf
big black PCB with a chip in the middle, marking "N51822" barely visible
the chip in a big bulky black round case, in my hand
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pathetic piss kitten @kitten@elizabeth.cat
9mo
kitten playing with trackers the third one, also nrf51822, this one is a bit weird... two button, and it's clearly a devboard embedded in a larger PCB. also CR2477

I found sort of a pinout, and it has plenty of gpio available... the case is weird though, no easy way of attaching it to anything, although it has some holes in it that could be used

a.aliexpress.com/_EGPL3pO
weirdly shaped black PCB, with a chip in the middle marked N51822, and a button on its side
the PCB in its transparent case, in a similar weird shape
the pinout for the devboard. with the antenna on the top, and the chip facing the viewer, the left side is: ANT, P0.22, P0.23, P0.24, P0.00, P0.01, P0.02, P0.03, P0.04 and the right side: P0.18, SWCLK, SWDIO, P0.16, P0.15, P0.12, P0.08, GND, VCC
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User avatar
Maaike 🔜 eth0 @ayke@blahaj.social
9mo
kitten playing with trackers @kitten it's actually pretty common to have modules like that. It means one manufacturer can design a module and make sure it works well (RF is magic), and others can just plop that on a PCB without worrying too much. Also apparently makes compliance easier.
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pathetic piss kitten @kitten@elizabeth.cat
9mo
kitten playing with trackers @ayke I mean, yes, but for an item in which keeping a small footprint is, or should be, a priority... feels wasteful
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Maaike 🔜 eth0 @ayke@blahaj.social
9mo
kitten playing with trackers @kitten agreed ^^
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