Álvaro Prieto

@alvaro
992 Followers
180 Following
174 Posts
Electrical/Firmware Engineer, maker, traveler. 
@unnamedre co-host. http://mastodon.social/@alvaro
websitehttps://alvarop.com
blueskyhttps://bsky.app/profile/alvarop.com
Álvaro PrietoJan 24
Helen LeighJan 23

I'm beyond excited to share that #Teardown2026 will be happening 24-26th July.

We're in a cool new space too: the Jupiter on Burnside. Our 60s mall era is dead, long live our 60s motel era.

I'll miss the mall but it'll be nice to run an event somewhere with furniture and internet.

Ticket sales, calls for participation + volunteers, and general info on the @crowdsupply website: https://www.crowdsupply.com/teardown/portland-2026

Álvaro PrietoNov 16
Tube❄TimeNov 15
did you know that you can find free Cortex M0 development boards at the side of the road? folks call them disposable vapes but they're hackable, and i've reverse engineered a bunch of them! see https://github.com/schlae/VapeRE/
Show threadÁlvaro PrietoOct 5
@esden yeah, that looks like what I expect they did
Show threadÁlvaro PrietoSep 30

@leo @wren6991 @timonsku I don’t think “always just use the included cable and only that cable” is a good solution. If that was the case it should be built in.

I’m surprised they don’t have this documented on their website at the very least. There must be some amount of support calls this generates 🤷‍♂️

Show threadÁlvaro PrietoSep 30

@leo @wren6991 @timonsku yeah, it’s very easy to make the assumption “oh, no cable has both CC lines, so this will always work!”

And in the past, most people would use the cheapest cables they could get away with. These days there’s a lot more eMarked cables.

I’m surprised that in all the testing it never came up, and if it did, that they just left it unfixed when the solution is so simple and inexpensive. Sure you have to spin the board, but cmon…

Show threadÁlvaro PrietoSep 28
@worik the new standard supports 48V @ 5A!
Show threadÁlvaro PrietoSep 28
@krutonium not bad. Thanks for the recommendation! Now I’ll have to find the time to play with it and make sure nothing breaks 😅
Show threadÁlvaro PrietoSep 28
@krutonium probably the damn Hugo template I’m using. 🤦‍♂️
I hate UIs
Álvaro PrietoSep 28

Do you have a J-Link compact and wonder why it only works with _some_ USB-C cables? I looked into why that is 🤬

https://alvarop.com/2025/09/j-link-compact-usb-c-issues/

Show threadÁlvaro PrietoAug 17, 2025

@adistuder Yeah! I was using C and kept having issues. CS pin wasn't toggling, so I switched to a GPIO and then that was working ok.

Then the MISO pin was getting stuck at 2V, so I enabled a pull-down resistor 😂

Decided to switch to micropython to see if it made a difference. Once I figured out how to set custom pins I immediately got an "Invalid MISO pin" error. At least it's an easy bodge from GP4 to GP8 (and it's thankfully unused on my board)