The MagPi, Issue 67

MagPi Issue 67This month’s MagPi magazine includes a review of the Allo DigiOne Player, a clever though high-priced add-on for the Raspberry Pi which its creator claims gives it pitch-perfect digital audio capabilities.

Designed as a ‘digital transport’ – a device which provides a digital, rather than analogue, signal for decoding by an external digital-to-analogue converter (DAC) – the DigiOne Player is a plug-and-play design based on Allo’s DigiOne S/PDIF HAT. As the name suggests, the primary part of the Player is a Hardware Attached on Top (HAT) add-on for the Raspberry Pi which provides a Sony/Philips Digital Interface (S/PDIF) audio output on an RCA or BNC jack; the Player is simply a bundle which includes a Pi, case, and cabling.

There’s no denying that the DigiOne is a clever design, with a surprising amount of hardware crammed into a small space. At nearly £150, though, it’s priced head and shoulders above the competition and lacks some of their features – such as the optical output of the £30 JustBoom Digi HAT, ditched due to what Allo calls unacceptable built-in jitter levels avoided through the use of electrical connectivity.

For my conclusion on the device’s value, you can pick up The MagPi Issue 67 at your nearest supermarket, newsagent, or for free download under a Creative Commons licence via the official website.

Linux User & Developer, Issue 167

Linux User & Developer Issue 167This month’s Linux User & Developer includes my review of Pimoroni’s Black Hat Hack3r family of break-out boards, designed for both the mainstream Raspberry Pi and ultra-compact Raspberry Pi Zero single-board computers (SBCs).

While Pimoroni isn’t exclusively focused on the Raspberry Pi platform, it’s no secret that the Sheffield-based company has plenty of ideas in mind for enhancing the popular devices. The Black Hat Hack3r range started out as an internal development tool, designed to make it easier to debug Hardware Attached on Top (HAT) devices – add-on boards which cover the 40-pin general-purpose input-output (GPIO) header on top of the Raspberry Pi – without having to deal with a rat’s nest of cables or easily-knocked debug clips.

The boards are simple at their heart: with no active components, all they do is mirror the GPIO header. A ribbon cable connects the board – available in full-size and a Mini variant designed specifically for the Raspberry Pi Zero – to the Pi’s GPIO header, and the HAT under investigation is connected to the mirrored header. A third header then provides full access to all 40 pins, which opens up a wealth of possibilities: you can add additional hardware at the same time as the HAT, sniff signals coming to or from the HAT for debugging or reverse engineering reasons, or even connect more than one HAT to a single Pi by daisy-chaining multiple boards.

I’ve long been a fan of Pimoroni’s designs, and the Black Hat Hack3rs are no exception to the company’s rule of clever boards with attractive layouts and finishes. To get my full opinion, though, you’ll have to pick up a copy of Linux User & Developer Issue 167 from your nearest newsagent, supermarket, or electronically via digital distribution services such as Zinio.