Project: The Grand Kiosk, a Nerves journey

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I’ve mentioned it previously in this thread that I’m poking and playing with the Seeed Studio ReTerminal DM which is a $300-400 piece of industrial kiosk kit. I like the look and feel of it and it makes for a very promising prototype platform for anyone wanting to do visual or interactive stuff with Nerves.

Tom Winkler at Formrausch made a Nerves system for it. And I’m hacking away at a demo-friendly featureful sample project.

Figured I’d show some of my progress here on the forum.

I’ve posted YouTube Shorts about it as well (1, 2, 3).

It comes with a solid set of peripherals:

  • Touchscreen
  • WiFi antenna
  • Light sensor
  • Microphone array, two mics
  • NervesKey chip (ATECC608)
  • Convenient boot switch for flashing the CM4 inside
  • Slot for M.2 drive

Plus plenty of ports and some GPIO stuff. It can also be enclosed to make it reasonably IP-classed for water and dust supposedly :slight_smile:

A variant exists that gives you PoE + a camera. Wish I’d grabbed that, it is not upgradable to it.

I will try to put notes about what I do with this thing as I go :slight_smile: Feel free to ask questions if you follow along.

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Tom got most of the peripherals working via Linux drivers. So I can query a bunch of driver “files” to get light levels for example. But the mic was not working.

arecord -l did not give the expected device information.

So I’ve had a spelunk all across the Seeed studio overlays, added new firmware versions for RPi. Poked alsa settings. Then found a missing piece of linux config. Added that.
Suffice to say I have the microphone working on the ReTerminal DM.

And also, I’m fairly certain everything except that piece of linux config can be removed. Verifying that now…

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Yup. One line.