Yet Another (PiZero) Wi-Fi 'Hat'

I had some interesting ideas last week about a possible modular solution. With the abundance of SDIO cards available from sites like Aliexpress it would be nice to use these modules without any FCC testing (byo wifi). I ordered a couple cards from there earlier in the month but am not really holding my breath for them to come (guessing it'll be closer to the Summer months).

With that in mind, I made a more elegant looking SDIO Hat and have it out on order from OSH Park, more on that when the boards come back, which should be sometime in the next couple weeks.

I've updated my Github with the latest version of the WILC1000 based Hat and attached the updated schematic to this project page. Any feedback on errors is appreciated!

Also, congrats to all the winners of the first round of the Pi-Zero contest!

So as you all have kindly pointed out, the large sd form factor dev board made by Atmel is less than ideal for use in a HAT which is supposed to help cut down on bulk. I completely understand this. I've come up with a rough schematic and board layout for a WILC1000 based WiFi hat.

There are some major stability issues I am still trying to work out, in that the entire interface goes down after the throughput reaches a certain threshold (around 10Mb/s). I am pretty sure it's a power related issue, the chip probably needs more current than the 3v3 rail can provide. My Pi doesn't want to stay powered on when I try to measure current draw of the card which is an issue.