On: There's an ARM Cortex-M4 with Bluetooth inside a C...

[wcunning]

So my followup question is: I have a few of these, can I do anything with them once I'm done with the test? Hook up to the headers and reprogram? What about the Binax test? Or any of the other "connected" ones?

[wcunning → wcunning]

Answering my own question: he gets there much later in the thread -- looks like single wired debug is available at a pad on the board.

https://twitter.com/Foone/status/1475268224635662336

[stbtrax → wcunning]

probably not worth your time unless you're looking for an art project. you can get a devkit for dollars that has pins brought out and more flash and ram https://www.aliexpress.com/item/1005001593980172.html

[numpad0 → wcunning]

Basically all those nRF5x products are Arduino compatible AirTags with a battery included. IIRC they also have an imprecise but low power, chip integral temperature gauge. Maybe a wireless interval thermometer might be a good start?

[antoniuschan99 → numpad0]

Yea I saw somewhere airtags are just Nordic chips? Kind of surprised because the airpod w1/h1 chips aren’t

[logbiscuitswave → antoniuschan99]

I would guess either better margins or better low power performance for better battery longevity in the nRF 52.

[theta_d → wcunning]

Binax is just some cardboard and a strip, no chips.