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Tux Machines
Posted by Roy Schestowitz on Apr 14, 2023
> Last year I floated the idea of a custom PCB to 'plug a computer into a graphics card' to Mirek. He didn't immediately say 'no', so I started pursuing the idea, coming up with this quite basic post-it note illustration: [...]
> Miraculously, through a series of emails, we refined that concept into a working PCB design. Mirek had it printed by JLCPCB, soldered on a bunch of SMD components, and shipped the PCBs (along with some metal brackets he had his friend Adam fabricate) by February.
> Because this pans and tilts, it needs two motors. Those are stepper motors controlled by an Arduino Nano Every board through two TMC2208 stepper motor driver modules. A joystick on the remote lets the user pan or tilt, while an LCD provides information. The remote connects to the main unit via an Ethernet cable. The enclosures and most of the mechanical parts are 3D-printable, but this project does require some hardware like pulleys, bearings, and aluminum tube.
> So I've been searching for a holy grail: combination of smart (or smartified) light switches on the walls and smart light bulbs (with colors and dimming) that works with automations when Home Assistant is online and also just works directly to power lights on and off when Home Assistant is offline.
> And I think I have found a solution that will be acceptable for me. The solution involves taking a normal dumb light installation, putting in smart light bulbs (any that Home Assistant can manage) and then wiring in a Shelly next to an existing dumb wall switch. For design consistency sake it would be good if the wall switch is of impulse type (so only connecting the connectors when the button is being pressed, like a doorbell button), but the setup should also work for normal toggle wall switches with minimal changes. Some settings on the Shelly and a custom Shelly script will take care of offline functionality. Note: Gen1 Shelly devices do not have scripting capabilities, you need a Gen2 device to do this, like the linked Shelly Plus.
> Tobias Mann's Los Alamos Taps Seagate To Put Compute On Spinning Rust describes progress in the concept of computational storage. I first discussed this in my 2010 JCDL keynote, based on 2009's FAWN, the Fast Array of Wimpy Nodes by David Anderson et al from Carnegie-Mellon. Their work started from the observation that moving data from storage to memory for processing by a CPU takes time and energy, and the faster you do it the more energy it takes. So the less of it you do, the better. Below the fold I start from FAWN and end up with the work under way at Los Alamos.
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