Hacking Hardware McFly - an RP2040 board compatible with Picofly

[KingMo5h]

I tried my best on the space between cpu and ram. Not much space there. I guess it should work but cant link it here, since not enough post written...

Post automatically merged: Mar 26, 2023

https://abload.de/img/slim0teob.jpg

Maybe it works now. The left part is the actuell part you put in between, the right one ist just for flashing and should be removed after.

 

[Saliciae]

That looks awesome!

 

[KingMo5h]

Also the top right part is are the mosfets but since i dont know the space or have the measurements. I cant design it.
It is for a 2 Layer PCB with a maximum thickness of 0.6mm, then it should fit under the shield.

 

[Saliciae]

Not sure about untented vias under the chip as they might get shorted to ground

 

[KingMo5h]

Yes, could be a problem if not tented or with silk on it. But Space is restricted

 

[Dee87]

Not sure about untented vias under the chip as they might get shorted to ground

U can still put a thin layer of soldermask on the bottum if it need to

 

[LogicalMadness]

Cut the bar that runs across?

 

[Saliciae]

U can still put a thin layer of soldermask on the bottum if it need to

but the RP2040 chip goes on top, soldermask applied by hand will stop the chip soldering properly. Best solution is not have vias under chip, but second best solution is order with tented vias

 

[busmanl30]

Cut the bar that runs across?

not a bad idea tbh, double sided kapton tape would do the job

 

[Saliciae]

PCBs just came in, joycon strap for scale, these things are tiny!

 

[Dee87]

PCBs just came in, joycon strap for scale, these things are tiny!

looking realy nice

nice job Man!!

 

[musashiro]

do we still need to solder anything? either way, I am still happy to hear any developments for the switch, keep up the good work folks

 

[linuxares]

do we still need to solder anything? either way, I am still happy to hear any developments for the switch, keep up the good work folks

lol yes, there will most likely NEVER be a solderless with the Switch.

 

[hippy dave]

PCBs just came in, joycon strap for scale, these things are tiny!

Beautiful. Bonus points for purple

 

[Saliciae]

Components are on their way too. Hopefully this weekend i can get some put together and measure the thickness, I think the whole board with components will by 1.6mm with the flat flex connector, possible thinner without it, so no case bending to make it fit!

I'm also exploring porting an RCM injector firmware like switchME or Fusee Suite to the rp2040 giving this board usage in unpatched switches (like mine ) but it should be a useful development board for lots of space constrained applications i think

 

[Gardosen]

@Saliciae any plans to release a components list + schematic where to put which piece?
I think this would be pretty nice, as i for myself would love to build the mcfly (Amazing name btw) myself for me and a friend.

 

[Saliciae]

Once tested and confirmed to be a good device all source will be released. I dont want potentially broken schematics etc floating around the internet

 

[KarimPolska]

@Saliciae excellent work buddy! Is there any reason why to not integrate the MOSFET on board?

 

[linuxares]

@Saliciae excellent work buddy! Is there any reason why to not integrate the MOSFET on board?

Mosfets should be as close to the APU as possible for best results.

 

[gokuz]

Mosfets should be as close to the APU as possible for best results.

Time to debunk this once and for all. The original flex cable has quite a distance from the capacitors. Its more of a design choice that has been used since SX. No reason the mosfet incorporated in the main chip will work differently.

The only reason the "close to the APU" is a thing is because of the beta people trying out stuff to make their lives easier by soldering it directly to the capacitor.