First of all: thank you for making cool things....

But ehm... why don't we start using (for instance) the wiki at your Github repository to document them a little more? I realise you have a bunch of really busy engineers making products and not all speaking english, but if you really have no time to document, please just dump code, schematics, PCB designs, 3D CAD or whatever else and we'll help making it look pretty and tell people how it works in ways that they can understand. This helps us build stuff and having stuff documented well makes more people buy more product. Win/win, right?

The alternative is that we start reverse-engineering your made-for-prototyping hardware. Which is doable, but a silly waste of time. Where are you located, and what are your documents written in? And are there volunteers here on the forum that speak Mandarin/Cantonese?

My personal off-the-top-of-my-head wishlist...

• The schematics and any other documentation regarding the FACES keyboards and the plate underneath, so we can figure out if we can detect its presence and if/how we can trigger from software the reset-button double-click power off state that also turns off the keyboard. (If that is not triggerable from software, it probably should be in the next version.)

• Any internal data you have on battery charging (capacities, time needed, USB power modes supported, etc etc) for all three batteries (the small bottom plate that comes with the unit, the battery stackable unit and the FACES bottom.

• The thing with button A and wifi: which units does it affect, is the fix with the analogRead the best way, can one use speaker, button A and wifi at the same time without the squealing sound? Does it affect the newer units?

But I am sure there is much more people can think about.

This is, in my mind, the coolest tinkering hardware currently out there. I'd like to see it get critical mass and have a rapidly expanding ecosystem of stackable boards, software libraries etc, etc. This cannot all be done by a small group inside one company. You will have your own ideas of where you are taking this, and you have the benefit of seeing what actually sells in the market, but I think you would do even better if you also to talk to the rest of the world more.

Somewhat unrelated, but now that I'm talking to you anyway: here's some random ideas from myself or others in this community:

• The proto board and the other boards should have the pins on the other side of the connector accessible. ( maybe like http://forum.m5stack.com/topic/95/custom-prototype-board )

• In future versions of the stackable boards, more pins need to be solder-jumper options: too many pin conflicts already.

• Maybe sell a cheap OEM laserdiode barcode reader in a stackable module, looking out at the top of the screen, so with the FACES bottom it can be a handheld inventory device etc etc. (Or even a small camera, to be used as a camera or for QR and other 2D barcodes?)