Mystery Project #2 - Bluetooth Module Programmers

RE: Mystery Project #2 - Bluetooth Module Programmers

dang74 — Wed, 23 Apr 2025 00:41:53 GMT

I was indeed baffled by the footprint with the pair of holes. Thanks for taking the time to explain this special feature in the video.

RE: Mystery Project #2 - Bluetooth Module Programmers

DAB — Sun, 20 Apr 2025 18:29:54 GMT

Great project Douglas.

RE: Mystery Project #2 - Bluetooth Module Programmers

beacon_dave — Sun, 20 Apr 2025 09:10:29 GMT

Solder Party does something similar to the test point insert called the 'FlexyPin'

https://www.solder.party/docs/flexypin/

https://www.solder.party/docs/flexypin/adapters/

RE: Mystery Project #2 - Bluetooth Module Programmers

kmikemoo — Sat, 19 Apr 2025 23:36:27 GMT

Very nice, [mention:193ac2434c814a24b46635a2210baec1:e9ed411860ed4f2ba0265705b8793d05] . I really like the jig for the castellated boards. Very practical.

RE: Mystery Project #2 - Bluetooth Module Programmers

beacon_dave — Thu, 17 Apr 2025 21:44:10 GMT

Is the colour scheme significant beyond identifying unit 1 and unit 2 ?

RE: Mystery Project #2 - Bluetooth Module Programmers

beacon_dave — Tue, 15 Apr 2025 09:24:47 GMT

"...but why do I need two of them?..."

You accidentally left the 'number of copies' set at 'two' when you hit the print button ?

or...

it could be a Bluetooth wireless link in which case you would need two to complete the link.

or...

it could be for Bluetooth beacons in which case the more the merrier.

or...

it could be for Bluetooth broadcast.

or...

you've found another box of ice hockey pucks in the garage...

RE: Mystery Project #2 - Bluetooth Module Programmers

DAB — Sat, 12 Apr 2025 19:30:11 GMT

Very interesting.

RE: Mystery Project #2 - Bluetooth Module Programmers

colporteur — Fri, 11 Apr 2025 18:16:35 GMT

I want to play hockey:(

I retired three years ago. I coach to compensate. I keep thinking I can still play. My minds thinks I can do things as a goalie that my body attempts and then complains constantly for days after. Be able to walk is something I value:)

Played out once and the the next game I was in net. Started at age 8 and played until I was 61. I guess that is not a bad run?

RE: Mystery Project #2 - Bluetooth Module Programmers

beacon_dave — Fri, 11 Apr 2025 16:29:18 GMT

"...There is something strange about this PCB...."

The absence of visible traces perhaps ?

The absence of a feline observer, not even a paw in frame... ?

The absence of a hockey puck ?

RE: Mystery Project #2 - Bluetooth Module Programmers

michaelkellett — Fri, 11 Apr 2025 08:11:52 GMT

Is it an aluminium substrate PCB ?

RE: Mystery Project #2 - Bluetooth Module Programmers

balajivan1995 — Fri, 11 Apr 2025 06:22:29 GMT

MCU + Wireless Module + Display

That's all I can guess for now.

RE: Mystery Project #2 - Bluetooth Module Programmers

vmate — Fri, 11 Apr 2025 05:10:50 GMT

Arduino Pro Micro + HC-05 Bluetooth module I assume.
The two FETs and 8pin IO at the bottom are confusing, there's no freewheeling diode across the FETs, so I assume the load is not inductive, ruling out relays and motors.
Two of the 8 pins at the bottom are power, with the only decoupling capacior on the entire board - something sensitive to supply voltage, or something relatively high power?

My guess is that some sort of sensor is hooked up to the bottom 8 pin IO, and the whole PCB is a Bluetooth data logger and IO thing, possibly for smart home stuff.