Hacking Adafruit Trinket M0 problem

[DayVeeBoi]

I`d take the opportunity to stick a 4056 and a 250mAh LiPo in it.

It is VASTLY overcomplicated for what it is. I mean, they even have an inductor attached to that (what looks like) LDO. Talk about overkill. Shame they put such a crap cell in it.

You have any opinion on why they would make it so overbuilt? I think its probably safe to assume the design is probably kicking around chinese forums since so many variations of this board popped up at once. There's a version with 2 capacitors in place of battery floating about as well. Im thinking that maybe someone just tried to adapt that design to LiPos to save money or something.

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I`d take the opportunity to stick a 4056 and a 250mAh LiPo in it.

I'm gonna put a button cell holder I think

 

[mattytrog]

You have any opinion on why they would make it so overbuilt? I think its probably safe to assume the design is probably kicking around chinese forums since so many variations of this board popped up at once. There's a version with 2 capacitors in place of battery floating about as well. Im thinking that maybe someone just tried to adapt that design to LiPos to save money or something.

No idea. Thats the type of circuit you would build if you are using a dirty unfiltered switch-mode wall-wart (dc adapter) by the looks of it.
Maybe thats what it was for.

At least USB power should be semi-clean, therefore that is not necessary.

Might be to filter out square-wave harmonics or something. Who knows?

I`m still not convinced about that crystal though.

I'm gonna put a button cell holder I think

Just make sure it can`t charge it!

Keep us posted! At least it semi works...

 

[DayVeeBoi]

So for OP and the others who have commented in this thread with the same problem, just removing the battery then flashing it and replacing the battery will be infinitely easier than desoldering and soldering those tiny smd resistors. Obviously not an ideal solution but so far that's my best suggestion.
Seems the crappy old batteries they used have enough juice to send the payload, but they're leeching all the power from the microcontroller and causing brownout when attached to a computer (Take that explanation with a grain of salt).

An easier solution would be to follow @duckbill007 advice (thanks BTW) and use ctcaer's python script to modify the payload you need to boot. It is available here.

 

[sheg0]

An easier solution would be to follow @duckbill007 advice (thanks BTW) and use ctcaer's python script to modify the payload you need to boot. It is available here.

Could you provide a link? I don't know this script. It converts hekate bin-file to a dat-file, which we can load via the SX loader? I only used hekate so far

 

[duckbill007]

@DayVeeBoi, no I did not plug it into PC. I decided not to mess with dongle. Because I can not determine if it is V3 or V2, so I decided to leave it as is and convert payload.

 

[DayVeeBoi]

Could you provide a link? I don't know this script. It converts hekate bin-file to a dat-file, which we can load via the SX loader? I only used hekate so far

Sorry about that, I forgot to paste the link. It is here--> https://gist.github.com/CTCaer/13c02c05daec9e674ba00ce5ac35f5be you will need to have python installed.

 

[sheg0]

Thank you

 

[johnybjb]

So for OP and the others who have commented in this thread with the same problem, just removing the battery then flashing it and replacing the battery will be infinitely easier than desoldering and soldering those tiny smd resistors. Obviously not an ideal solution but so far that's my best suggestion.
Seems the crappy old batteries they used have enough juice to send the payload, but they're leeching all the power from the microcontroller and causing brownout when attached to a computer (Take that explanation with a grain of salt).

An easier solution would be to follow @duckbill007 advice (thanks BTW) and use ctcaer's python script to modify the payload you need to boot. It is available here.

Thanks. Removed the postive battery pin and now it doesnt cycle connecting / disconnecting. But doesnt show up on the PC, constant red light but no device detected. Any other thoughts before this goes in the bin?

 

[mattytrog]

Thanks. Removed the postive battery pin and now it doesnt cycle connecting / disconnecting. But doesnt show up on the PC, constant red light but no device detected. Any other thoughts before this goes in the bin?

Replace battery.

 

[johnybjb]

Replace battery.

Ok, but following the suggestion earlier which said remove the battery then flash. Resoldered postive connection but still the same. Oh well

 

[DayVeeBoi]

constant red light but no device detected. Any other thoughts before this goes in the bin?

That's the way it's supposed to work. To have it show up as a disk drive you need to press the reset button twice in succession while plugged into the usb port. To flash the device you need to install the Arduino IDE and clone the github repo, although you may not need to do this. All I had to do was just press the button twice.

My personal device would not charge or even have enough power to send the payload after I changed the payload. I suspect everyone elses (in this thread) may be the same. If your device is suddenly not doing anything at all (and it worked previously) it may be that your battery has just been depleted at this point.

 

[Canna]

Hold on a second ,,
You talk about adafruit M0 but show a cheap chinese dongle rip off

That is not a adafruit m0

Also with some programming, a long cable can fck you. try a shorter one or another port pref a back port, rather then a addon usb board..

But get what you pay for i guess.. if it dont work get a refund, is it really worth the hassle ?

 

[mattytrog]

Could you provide a link? I don't know this script. It converts hekate bin-file to a dat-file, which we can load via the SX loader? I only used hekate so far

In downloads section, I have modded CTCaers script to have file open and save dialogs and built it into a windows EXE.

No python needed. Give it a try!

https://gbatemp.net/threads/interna...ybitsy-m0-express-guide-files-support.508068/