SDWire: Open-source SD card mux | Hacker News Reader

SDWire: Open-source SD card mux

wiki.tizen.org

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These are pretty handy devices for embedded development. I’m currently working on my own similar one using a wifi enabled SD card and a slightly alternative set of parts since these cost significantly more than the SD cards I can get from A reliable store on AliExpress (they make their own hardware but are based in china so it’s effectively just their storefront) I don’t have any working software to show yet, I wouldn’t have bothered given how good these ones are… but I needed a couple dozen and at 79€ that was going to cost a lot more than a couple dozen at ~$10 USD

I also needed a couple dozen, but couldn't find inventory in stock (even at the 79 euro price point). Sending my own design off to the fab this week.

I'd be curious to see your revisions, if you're open to collaborating. WiFi-enabled SD cards are of interest to some of my users @ PrintNanny.ai

sdwire lacks one thing - a way to find out which usb-storage device belongs to which sdwire hardware (in case of having many sdwire devices connected to one pc). For wifi card there is fysetc wifi adapter but it is slow one in uploading to it over wifi (like 300KB/s).

Would be nice if your projects were published on github, so more people could benefit.

The Fystec adapter is actually the one I’m writing custom firmware for. It’s slow going since I don’t have much time for it and I’m not as familiar with the chip. I do plan on desoldering the UART/SD Card switch and replacing it with a set of opto-isolated header pins so I can drive the mode remotely and use the the UART mode via USB in order to get better data rates to the flash storage space. It’s a bit more work, but I’m trying to test Operating System on disk A/B update behaviour and other low level stuff, so I need to be able to wipe an SD as part of test provisioning if I want to automate the stuff I’m doing (and not doing enough of because of how much time it consumes)

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