Soldering of External Battery

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user103487

Hi Guys,

I have pulled one of my puck.js out of the draw again recently and have tried to drive it with a 3.3v power source for prototyping. Not sure what I am going to do with it but I would prefer not to burn through my batteries while prototyping so I have soldered on some headers and tried driving it through GND and 3v pins but this board has had some abuse and I didn't know how to solder when I orginally got it and it seems I damaged the trace...

Anyway, my question is can I use D24 and D23 for power connection?
I recall that they were supposed to be for external battery connection but can't find any info about it.
e.g. which one is GND?

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Robin in reply to @user103487

Fri 2019.09.20

I opened up the info page from:

http://www.espruino.com/Puck.js

below heading 'Information' opened up the schematic:

https://github.com/espruino/EspruinoBoard/blob/master/Puck.js/pdf/puckjs_sch.pdf

The correlation seems to be P0.15 == D15 so for D23 and D24 might be the pins in the upper right of the chip pinout. A rollover of the image from the first link indicates those two pins are not 5V tolerant, so this implies I/O rather than power, and the schematic seems to confirm this.

p.14 seems to confirm also:

http://www.espruino.com/datasheets/nRF52832_PS_v1.0.pdf

The board layout didn't provide any important additional info:

https://github.com/espruino/EspruinoBoard/blob/master/Puck.js/pdf/puckjs_brd.pdf

It seems the two pad GND through hole near D11 and the 3V power near D7 are the best bet.

'it seems I damaged the trace'

Could there be an unintentional bridged solder connection?

Do you have an ohm meter to check for shorts- opens?

Any chance an image of the botched solder area could be uploaded for us to determine if traces were in fact damaged? Other than an extremely long heat contact time way over two seconds with a high wattage iron (above 22W), might damage the copper trace, or repeated attempts without a proper solder removal means (vacuum, solder wick). Otherwise, within those estimated ranges should be okay. A keen eye here might confirm or provide a glimmer of hope . . . .

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