打造你的树莓派游戏机：第81期树莓派杂志解析

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"树莓派杂志第81期聚焦于 Raspberry Pi 的创新应用与项目构建，包括介绍新的 Jam HAT，利用 AI 监控植物，PiTalk 智能手机评测，以及如何制作游戏控制台等。此外，还列出了十大笔记本套件，指导读者打造便携式树莓派，并提供了 GPIO 零组件的电子制作教程。杂志旨在激发和帮助用户克服构建项目时的心理和实际困难，分享创意，解决问题，并推动社区互动。" 在这一期的树莓派杂志中，你可以找到一系列关于 Raspberry Pi 的创新实践。首先，"Meet the new Jam HAT!" 介绍了新推出的 Jam HAT 开发板，这是一款专为树莓派设计的扩展板，可能集成了音频处理功能，适合音乐爱好者或教育者用于编程教学和多媒体项目。接着，文章探讨了如何"Deploy AI to keep an eye on plants"，利用树莓派和人工智能技术来监控植物的生长状态，可能是通过图像识别分析植物的健康状况，对于家庭园艺和智能农业有很高的实用价值。此外，"PiTalk smartphone reviewed"是对 PiTalk 智能手机的评测，PiTalk 可能是基于树莓派开发的一款低成本、可定制的智能手机，让读者了解其性能和使用体验，为想要自己动手组装手机的爱好者提供了参考。杂志还提供了"Make a games console"的步骤指南，指导读者如何用树莓派组装一台复古游戏机，重温经典游戏，适合电子游戏爱好者和喜欢 DIY 的人群。在"Top 10 laptop kits"部分，列出了打造便携式树莓派的十大套件，这些套件可能包含了电池、显示器和外壳等配件，方便用户将树莓派变成一款便携式电脑。此外，杂志还强调了"Building with GPIO Zero"的电子制作教程，GPIO 零组件允许初学者无需深入电子知识即可进行简单的硬件交互，这对于教育和快速原型设计非常有益。这期树莓派杂志不仅提供了丰富的项目示例，还关注了项目构建过程中的思考和挑战，鼓励社区成员分享经验，共同成长。无论你是树莓派新手还是资深玩家，都能从中获得启发和乐趣。

he ‘Raspberry Pi in a vintage radio’

project is a stalwart of the community.

Pi computers the world over have rescued

otherwise defunct devices from the rubbish

heap and are often cited as a great example of

upcycling. When Raphaël Yancey, a maker from

Paris, France, was gifted his grandfather’s Optalix

TO100 radio, he decided to take this classic project

to the next level.

Raphaël’s love of Grand Theft Auto: San

Andreas’s in-game radio stations inspired him.

“It’s always a pleasure to steal luxury cars and

drive way too fast while listening to good music!

The hilarious talk-shows and skits make it even

more real,” he tells us. When the complete set of

station recordings was released by Rockstar, some

new ideas for a project started to form.

Raphaël

Yancey

Raphaël Yancey is a

maker and musician

from Paris, France,

with a keen interest

in programming,

electronics,

and music.

magpi.cc/VrTLVp

MAKER

He explains, “I thought of a way to listen to the

radio stations ‘in context’ without launching the

game. A radio set was the perfect choice, because:

rst, I had a spare one on hand; second, being

able to move between the stations would make it

real, like it’s taken right out of the game.”

Touch that dial

Raphaël’s radio plays ve stations from the game

in real-time. The radio features a ‘tuning’ knob

(a rotary encoder) that switches between each

station, complete with cross-fade. When you’re

listening to one station, the others continue

to play silently, making for a more realistic

experience. “I was really looking forward to

turning that knob, changing station, and then

coming back to the rst station to see it has

This vintage radio plays GTA’s radio stations, all in

real‑time. You can even tune between them.

PJ Evans talks to maker Raphaël Yancey

GTA:

San Andreas

Radio Set

This classic Optalix TO100 radio

retains its original speaker,

allowing a more authentic sound

The audio sources are GTA: San

Andreas’s in-game radio stations,

featuring music (over many

genres), talk-shows, and comedy

The original controls are replaced by two

rotary encoders: one for volume and another

to ‘tune’ between the various stations

GTA: San Andreas Radio Set

magpi.cc

PROJECT SHOWCASE

Being able to move between the stations

would make it real, like it’s taken right

out of the game

lived its life without me listening to it! That little

feature is what makes it real in my opinion.”

Channels funnel

The hardware side of this inspiring project was

straightforward enough: a Raspberry Pi 3, two rotary

encoders (tuning and volume), with an amplier to

power the original speaker. The challenges lay in

the software. The Pi would have to be playing ve

channels concurrently, one per station. Would it

be able to handle it? “The audio was really glitchy

when playing multiple les with the built-in

Raspberry Pi DAC,” recalls Raphaël, “so I bought a

cheap USB DAC (kind of a sound-card-on-a-stick)

to ooad this work.”

A further challenge was to be able to elegantly

cross-fade between each station, rather than a

straight, jarring cut. “I also struggled to nd an

audio mixer Python library that tted my needs

(controlling volume and position of multiple

audio tracks) and benchmarked all of them before

choosing swmixer.”

After some maths to work out an elegant

‘fade’, the project was complete. A hit with

the community, it was featured on many

popular maker sites, including the Raspberry Pi

Foundation’s blog.

Are there any further plans for the radio? “A

feature that was requested a lot was to add static

between stations to make it even more real,”

says Raphaël. “I could also optimise the code to

not play every track at the same time and rather

only play audible stations. In the meantime,

every contribution is welcome on the GitHub

repository: magpi.cc/wDBwEN.”

> There are ve

stations, from

88.7MHz to

108.0MHz

> This radio used

costs around £20

on auction sites

> The project can

run for hours on

batteries

> The rotary encoders

are the popular

KY040 type

> Raphaël wrote a

Python library for

the KY040s

Quick FAC T S

Inside the radio. Note the stripped-

down USB audio card used to ooad

the audio processing

One of the two KY040 rotary

encoders used to control the radio

With the speaker removed,

we can see an elegant

power solution which oers

more exibility over the

Pi’slocation

GTA: San Andreas Radio Set

magpi.cc

PROJECT SHOWCASE

ver the years, the Raspberry Pi has become

a rm favourite among enthusiasts of

retro gaming, thanks to its ability to

emulate classic computers and consoles from a

bygone era. Many use packages such as RetroPie

to create machines capable of playing games from

multiple systems. These are usually hooked up to

the makers’ big-screen televisions.

When Chris Mills decided to emulate the

Commodore 64, however, he had smaller

ambitions. Inspired by the recently-launched

miniature, THEC64 Mini, he set about producing

a tinier version of the age-old Commodore 1702

monitor. Or at least he did eventually. “The

original idea was to make a small box to hold the

monitor and a Raspberry Pi strictly for Commodore

emulation,” he says. “I wasn’t really planning on

making it quite as elaborate as it turned out to be.”

Mini marvel

Chris likes the Raspberry Pi, which is why,

despite buying THEC64 Mini and enjoying its

plug-and-play nature, he prefers using the Pi for

his Commodore 64 games. “I can get a lot more

software to run on it,” he tells us. This is mainly

Testing the notion that good things come in small

packages, this tiny replica monitor was created for

Commodore 64 gaming. David Crookes reports

Commodore

monitor

You wouldn’t believe how

loud a ‘silent’ 50mm fan is

in a box that size

Chris

Mills

Chris has had

an interest in

computers since

the late 1970s. He

got a Commodore

128 in 1985, and

says he likes getting

things to work as

much as actually

using them.

magpi.cc/VKPkzy

MAKER

due to him running the Combian 64 emulator,

which is a distribution based on an app called Vice.

“Its single purpose is Commodore emulation,

and it boots from a cold start to the blue

Commodore screen in just a few seconds,” he

explains. “It seems a bit closer to the real hardware

experience of a Commodore computer to me and

control seems far less laggy.” Hooked up to the

monitor and with the mini-C64 to its side, along

with a joystick, it makes for an impressive setup –

in appearance alone if nothing else.

Security monitor

To achieve the look, Chris chose a small TFT LCD

security monitor. “It needed to have a 4:3 aspect

ratio since the display would be for a computer

with 320×200 resolution,” he says. “I also wanted

something that would sit on my desk without

taking up too much space. I can’t imagine a

Commodore 64 displaying on a 32-inch television,

and I grew up with a 13-inch CRT for my computers

No, that’s not a

huge joystick: it’s a

standard size, but

it shows just how

small the monitor

is. THEC64 Mini sits

in front

Cables run from the circuit board of the monitor to the back

of the new case, so that the connectors are easily accessible.

Components are cooled by a fan

Commodore monitor

magpi.cc

PROJECT SHOWCASE

With a built-in AI voice assistant, this accessible smart

guitar can help almost anyone learn to play. Phil King

starts strumming

Chord Assist

Cutting the holes in the guitar and

then putting all of the parts inside

became quite a tedious task

earning to play the guitar can prove

dicult for people with sight or hearing

loss. Joe Birch’s accessible Chord Assist

guitar is intended to make the process a whole lot

easier for deaf, blind, and mute people.

In Joe’s family runs a condition known as

retinitis pigmentosa, which causes tunnel vision

over time; it has aected his mother, who is

now registered partially sighted. “Being closer

to people who have this condition opened up my

awareness of how it can eect peoples lives,”

explains Joe. “Currently, music is something that

is not so accessible to everyone, so I started to

think of ways in which it could become accessible

– which is where the idea for Chord Assist

came from.”

As well as an LCD screen, four-digit display, and

buttons to show and select chords, Joe’s modied

acoustic guitar features a Braille reader based

on his earlier BrailleBox news-reader project

(magpi.cc/LpjrGF). There’s even a vibrating

progress indicator next to the reader, to indicate

when a request is taking place.

In addition, the user can make a spoken request

for a chord using the built-in mic and Google-

based voice assistant, and hear a response via

the speaker. Also capable of playing a requested

note for tuning purposes, this system makes use

of Joe’s Chord Assist app (magpi.cc/xUAQNo) on

the Actions on Google platform, which can also be

used as a standalone learning aid on smartphones

and other devices.

Hidden components

The whole project took Joe around six months

to complete. “The most dicult part was

denitely the last stages of the build process –

Joe

Birch

Joe is an Android

engineer working

remotely at Buer,

currently from

Brighton in the UK.

He is also a Google

Developer Expert

in Android, Google

Pay, and Flutter.

chordassist.com

MAKER

Users can talk to the

guitar and receive

spoken responses via

the built-in speaker

An LCD screen shows chord

diagrams; alternatively, there’s

a Braille reader on the other

side of the guitar

The Raspberry Pi

and other electronic

components are

hidden inside the

guitar body, without

greatly aecting

its sound

Chord Assist

magpi.cc

PROJECT SHOWCASE

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