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Open Hardware/Modding: Raspberry Pi, RISC-V, HiFiBerry, and More

Submitted by Roy Schestowitz on Tuesday 7th of December 2021 08:18:39 PM Filed under
Hardware
  • Retro Reproduction Captures The Style Of The Sol-20 | Hackaday

    In the early years of the computer revolution, a machine like the Sol-20 really stood out. Where most hobbyist machines had front panels that bristled with toggle switches and LEDs, the Sol-20 was a sleek, all-in-one that looked like an electric typewriter in a walnut-trimmed box. Unfortunately, it was also quite expensive, so not that many were sold. This makes them hard enough to find 40 years later that building his own reproduction Sol-20 is about the only way for [Michael Gardi] to have one of his own.

  • Imagination Catapults into RISC-V

    Imagination unveiled four RISC-V-based “Catapult” CPU cores: two 32-bit MCU cores and two 64-bit designs that run Linux, including an automotive functional safety core.

    The big news on the first day of the RISC-V Summit in San Francisco was the announcement from Imagination Technologies that it was launching four RISC-V core designs under a Catapult brand. This summer, Imagination revealed it was building RISC-V CPU cores, and it has now announced four Catapult CPU designs.

    The in-order cores include two 32-bit MCU-like cores and two 64-bit models that run Linux. The UK-based company refers to the four core categories as “dynamic microcontrollers; real-time embedded CPUs; high-performance application CPUs; and functionally safe automotive CPUs.”

  • Adding Optical Audio to the Raspberry Pi with One Chip

    In the home theater space most people would tell you the age of optical audio, known officially as TOSLINK, is over. While at one time they were the standard for surround sound systems, the fiber cables with their glowing red tips have now been largely supplanted by the all-in-one capabilities of HDMI on new TVs and audio receivers. But of course, that doesn’t mean all that TOSLINK-compatible hardware that’s in the field simply disappears.

    If you’re looking to connect a Raspberry Pi to the optical port of your AV system, [Nick Sayer] has you covered. His “TOSLINK Transceiver Hat” utilizes a WM8804 chip from Cirrus Logic to go from the Pi’s I2S audio output to S/PDIF. From there the signal goes directly into the TOSLINK input and output modules, which have the appropriate fiber optic hardware and drivers built-in. All you have to do from a software standpoint is enable a boot overlay intended for a digital-to-analog converter (DAC) from HiFiBerry.

  • Guitar Pickguard Adds MIDI Capabilities

    For a standard that has been in use since the 1980s, MIDI is still one of the most dominant forces on the musical scene even today. It’s fast, flexible, and offers a standard recognized industry-wide over many different types of electronic instruments. Even things which aren’t instruments can be turned into musical devices like the infamous banana keyboard via the magic of MIDI, and it also allows augmentation of standard instruments with other capabilities like this guitar with a MIDI interface built into the pick guard.

    [Ezra] is the creator of this unique musical instrument which adds quite a few capabilities to his guitar. The setup is fairly straightforward: twelve wires run to the pick guard which are set up as capacitive sensors and correspond with a note on the chromatic scale. Instead of using touchpads, using wires allows him to bend away the “notes” that he doesn’t need for any particular piece of music. The wires are tied back to an Adafruit Feather 32u4 microcontroller behind the neck of the guitar which also has a few selectors for changing the way that the device creates tones. He can set the interface to emit single notes or continuously play notes, change the style, can change their octave, and plenty of other features as well.

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