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What the fuck is an SBAT and why does everyone suddenly care
📰 mjg59.dreamwidth.org
📅 2024-08-22 08:52
Short version: Secure Boot Advanced Targeting and if that's enough for you you can skip the rest you're welcome.Long version: When UEFI Secure Boot was specified, everyone involved was, well, a touch naive. The basic security model of Secure Boot is that all the code that ends up...
Client-side filtering of private data is a bad idea
📰 mjg59.dreamwidth.org
📅 2024-08-19 19:03
(The issues described in this post have been fixed, I have not exhaustively researched whether any other issues exist)Feeld is a dating app aimed largely at alternative relationship communities (think "classier Fetlife" for the most part), so unsurprisingly it's fairly popular in...
SSH agent extensions as an arbitrary RPC mechanism
📰 mjg59.dreamwidth.org
📅 2024-06-12 02:57
A while back, I wrote about using the SSH agent protocol to satisfy WebAuthn requests. The main problem with this approach is that it required starting the SSH agent with a special argument and also involved being a little too friendly with the implementation - things worked beca...
Digital forgeries are hard
📰 mjg59.dreamwidth.org
📅 2024-03-14 09:11
Closing arguments in the trial between various people and Craig Wright over whether he's Satoshi Nakamoto are wrapping up today, amongst a bewildering array of presented evidence. But one utterly astonishing aspect of this lawsuit is that expert witnesses for both sides agreed th...
Debugging an odd inability to stream video
📰 mjg59.dreamwidth.org
📅 2024-02-19 22:30
We have a cabin out in the forest, and when I say "out in the forest" I mean "in a national forest subject to regulation by the US Forest Service" which means there's an extremely thick book describing the things we're allowed to do and (somewhat longer) not allowed to do. It's a...
Bus Pirate 5 is here!
📰 Dangerous Prototypes
📅 2024-01-22 14:09
Bus Pirate 5 is the latest version of the multi-tool hackers trust since 2018. RP2040-based, color LCD, 1-5volt power supply and IO buffers, and more! Firmware, hardware and a fresh new forum are hosted at BusPirate.com, which I rescued from spammers a few years ago. The software...
Happy New Year 2024 from Dangerous Prototypes
📰 Dangerous Prototypes
📅 2024-01-01 05:21
Happy New Year! Thank you for reading the blog and being part of our community in 2023! We’re looking forward to more open hardware projects, more how-tos, more videos, more free PCBs, and more hacking in 2024.
Merry Christmas!
📰 Dangerous Prototypes
📅 2023-12-25 06:53
Merry Christmas and Happy Holidays to all. May you find many PCBs and other electronics wizardry under your tree or pole. Remember, support is available on Christmas. Just give us a shout in the forum.
App note: The difference between current sense resistors and hall effect sensors for motor control
📰 Dangerous Prototypes
📅 2023-11-26 17:00
App note from Bourns’ comparing current shunt resistors and hall effect current sensing pros and cons. Link here (PDF) Current sensing is an essential design function that is necessary in a broad range of applications. For example, current sensing is needed to detect a battery’s ...
App note: A simple solution for LED overtemperature protection
📰 Dangerous Prototypes
📅 2023-11-26 13:03
Bourns’ new thermal cutoff device for LED protection can be found in this paper. Link here (PDF) Compared to traditional lighting technologies such as incandescent and fluorescent lamps, LED lighting has a much longer life span, consumes far less energy and offers shock and vibra...
App note: Linear motion potentiometers
📰 Dangerous Prototypes
📅 2023-11-12 17:00
App note from Bourns on linear motion potentiometers and how they can be used to detect position by voltage division ratio. Link here (PDF) The elements of the LMPs are manufactured with conductive plastic (CP) for extended wear capabilities. Unlike Trimmers, which are “set and f...
App note: How Silicon Carbide power schottky diode properties provide enhanced application capabilities
📰 Dangerous Prototypes
📅 2023-11-05 17:00
Great read from Bourns’ white paper about the new SiC Schottky diode which revolutionize power handling capability and other benefits compared to Silicon diodes. Link here (PDF) For diode applications, the ideal component would be one with no voltage drop during forward conductio...
App note: Trimmers interfacing with surveillance system sensors
📰 Dangerous Prototypes
📅 2023-11-05 13:00
App note from Bourns about the robustness of trimmers used on surveillance system, typically sealed to protect agaisnt harsh environment. Link here (PDF) Trimmer technology is designed for use in applications where the unit must be calibrated before it is shipped to a retailer, a...
App note: Basics of linear fixed resistors
📰 Dangerous Prototypes
📅 2023-10-29 13:22
App note from Vishay going back to the fundamentals of humble fixed resistors. Link here (PDF) In the shadow of microelectronics, passive components such as discrete resistors would seem to have fallen out of the field of view in electronics. Yet, it is the rare circuit that can ...
App note: Nexperia load switch ICs
📰 Dangerous Prototypes
📅 2023-10-22 14:07
Nexperia’s app note on their load switches, combining multiple load switch functions in to one chip. Link here (PDF) Nexperia load switch ICs are highly integrated Power Management Integrated Circuits (PMICs) designed to efficiently control power rails within electronic systems. ...
Using Gamepads and Joysticks in JavaScript
📰 beej.us
📅 2017-03-01 00:00
Let's get some games written!