Quote:
Originally Posted by drgonzalez94
Indeed, that picture sure makes it look like the traces make a beeline toward the shield with less than a centimeter of space. I'm having a little bit of trouble understanding what to do as far as the reset and on/off connections. Are they to be used in lieu of the serial? I would imagine they can be programmed as inputs, but I'm not exactly sure how to do that. It's a bit above my paygrade without some kind of help or a guide. I couldn't find anything via search. Is there any detailed info anywhere, or any insight you can provide? 
I'll definitely make my next attempt at this with a microscope. I tried dissolving the solder mask already but acetone simply cleans it, and no better than some denatured alcohol. I might try some medical/reagent grade stuff (if I can get my hands on it). The only thing I can think of that will dissolve solder masks on commercial PCB's are strong solvents like methlyene chloride. I don't want to do that as it can be difficult to do with pin point accuracy but I could try scratching slowly away at it now that I know exactly where the trace is...perhaps with a pick or a scraper/knife and maybe I can solder directly to the trace. Seems like a viable option, but I'd rather try the on/off reset route first, if I can find enough information to be able to do it.
I know the light is a little weak. I'll try to get some better pictures with a brighter light if I can find one but I can't promise anything 
Regards,
Dan |
Both the on/off and the reset are pictures of a push button switch.
Momentary contact of the lead marked 'cntrl' in the pictures to ground does just what the solder mask claims.
I.E:
Turns device on->off and off->on
The other one triggers a hardware reset.
It is the "USB boot" pair that are still a mystery.
They are 3v3 rather than 1v8 and from the picture on the sm, it looks like they are suppose to be held connected while triggering a hardware reset.