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Open Hardware/Modding: Arduino Projects and Precursor

Submitted by Roy Schestowitz on Wednesday 23rd of June 2021 05:04:53 AM Filed under
Hardware
  • This shield brings a tic-tac-toe game to your Arduino Mega, complete with an AI opponent | Arduino Blog

    Tic-tac-toe is a nearly perfect time-wasting game as it’s quick to play, easy to learn, and has a very small set of rules, which makes it ideal for implementation on a microcontroller. Michael Klements wanted to take it a step further and add a simple AI that can effectively play against a human opponent while never losing a single match. The device he came up with is a shield that fits onto an Arduino Mega and features a grid of LEDs and corresponding tactile buttons. A player can then choose from one of three different modes: easy AI, expert AI, or a human opponent.

  • Adding a ChaCha Cipher to Precursor’s TRNG « bunnie's blog

    This is the second post of a two-part series on Betrusted/Precursor’s True Random Number Generator (TRNG).

    A bulletproof source of random numbers is a key component of any cryptosystem, so we’ve done an extensive, months-long characterization of Precursor’s dual, redundant TRNG sources, which consists of an avalanche noise generator and a ring oscillator. We’ve found them to produce passable raw entropy, but you don’t have to take my word for it. You can download our raw data and run your on analysis on it if you like (at least until our ISP cuts us off for serving multiple 10GiB files filled with random data).

    [...]

    After poking around a bit on the Internet, it seems popular to feed a seed of entropy into the ChaCha20 stream cipher (I refer to it as a “cipher” in this post, but I think more technically because of the way I’m using it, it should be referred to as a CSPRNG – Cryptographically Secure Pseudo Random Number Generator). This is done in the Linux kernel as well as by cryptech.is’s HSM and a few other implementations. The devil, of course, is always in the details. Cryptech.is takes the output of their TRNGs, hashes them with a SHA2 block, and then feeds it into a ChaCha20 stream cipher. Linux maintains an entropy pool that is collected from a variety of low-and-high-quality sources, blends them using some fast and slow techniques based upon the nature of the source, runs it through SHA1, and then into ChaCha20 to create the final stream.

  • Arduino rocks babies to sleep, gives parents a break | Arduino Blog

    If there is one thing for which babies are infamous, it is their complete inability to fall asleep and stay asleep. Rocking cradles can help them drift off, but they require a parent’s attention. Modern motorized rockers solve that issue, but they can be expensive. That’s why Peter Turczak used an Arduino to build an electromechanical rocker mechanism for cribs.

    Turczak kept the costs down on this project by using 3D printer parts. The frame, which attaches beneath an existing crib, was constructed from aluminum extrusion. The frame is in two parts and the top half slides on linear rails with bearings. A NEMA 23 stepper motor pushes the top half of the frame back and forth using a ball screw. Two reed switches act as end stops so that the motor doesn’t grind.

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