• 5 Posts
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Joined 3 years ago
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Cake day: June 16th, 2023

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  • I’m running out the door, so sorry for keeping this a little terse. Just wanted to throw out some things for you to potentially look into with regards to your USB-C port in case you were about to send this PCB off for fabbing.

    1 - Consider including an ESD Protection chip. It’s a small IC which you pass your data lines through. It can help protect your microcontroller in case there’s some static electricity in the cable you’re plugging in.

    2 - There’s a variety of different detection mechanisms and handshakes in USB-C to identify the amount of power a USB-C device supports. Adding a pair of 5.1K resistors to the CC1 and CC2 pins on your USB-C port will definitively tell the device on the other end that your keyboard is a simple USB 2 device and should get a nice chill 5V. Some devices will default to providing 5V is CC1 and CC2 are left floating, but others are more picky. Adding the two 5.1K resistors will help make sure you don’t run into any trouble with a USB-C to USB-C cable.

    3 - I’m less confident on the specifics of this one, so maybe do a bit of research yourself. Most of the USB-C implementations I’ve seen on keyboards tie the redundant pins on the USB-C port together. I believe some of these are only connected when the cable’s face up, and others are only connected when the cable’s face down. Routing them together on your board will make sure you don’t run into any trouble with cheap USB-C to USB-A cables.

    Here’s a quick example of those three items in action. (Ignore the weird vias and disconnected ground nets. I deleted the fill to make it easier to read.)

    Sorry to post and run. Hope that helps!










  • This is pretty typical for universities. They don’t want the airwaves clogged, doubling up NAT can lead to networking wonkiness, and they don’t want you giving university network access to unauthorized folks with an open AP.

    When you say VR streaming, you just mean wireless from your PC to the headset, right? There’s a chance you could do that with an offline wireless router if the VR experiences you’re looking to play are single player.



  • V2H unfortunately isn’t broadly available as a concept in the US yet.

    For what it’s worth, most of the Kia/Hyundai V2L plugged into your house shenanigans aren’t as convoluted as they might seem. Basically there’s something called a Transfer Switch that you can get installed into your house’s circuit breaker. It tells your house to stop pulling power from the grid, and start pulling it from whatever you have plugged into the switch. It’s technology that’s been around for ages for gas generators. You can hire an electrician to install it. The big issue with the current Kia/Hyundai V2L and transfer switch setup is 1) the car’s doesn’t put out enough voltage to power an HVAC system in certain power outage situations, and 2) You don’t any of the novel back and forth charging where your house / the grid can use your car like a cheap reserve. Folks have used Ioniq 5s to keep a fridge and some lights going for days though.

    At this point your options are be a Lightening early adopter, wait, or buy whichever electric car you’d like now and maybe look into a generator.









  • I still cannot believe NASA managed to re-establish a connection with Voyager 1.

    That scene from The Martian where JPL had a hardware copy of Pathfinder on Earth? That’s not apocryphal. NASA keeps a lot of engineering models around for a variety of purposes including this sort of hardware troubleshooting.

    It’s a practice they started after Voyager. They shot that patch off into space based off of old documentation, blueprints, and internal memos.


  • Just got my Ambient Twilight silent choc switches in! These switches feel incredible. I’d been running tape/floss modded Red Pros up until now. Their sound is similar depending on how well you did the mod, but they always felt disappointingly mushy. The Twilights are even quieter and have a nice satisfying linear feel. They’re definitely quiet enough to start bringing to the office more regularly.

    The keyboard’s a variant to last year’s TypeBoy. A pair of modded Game Boy Advance cartridges house a custom PCB, XAIO BLE, shift register, and Sharp Memory Display. (When you don’t accidentally crack one during installation. Whoops.) The Mark II trades the staggered column setup for an ortholinear layout with an offset mod row. The new shape helps channel the handheld vibes a bit better. I went with a PCB stack this time for the case. Partially to try something new, partially to hide the bright Pro Red switches. I’ll have to let the Twilights shine a bit more on the next revision.