探索MagPi 56：Raspberry Pi社区的官方月刊

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"MagPi56杂志是一本专注于树莓派的官方月刊，由树莓派社区撰写，专为该平台用户和爱好者提供丰富的资源和教程。这期杂志发行于2017年4月，售价为£5.99。它包含了多种精彩项目和实用技巧，展示了树莓派在不同领域的应用。 1. 项目与教程：本期杂志提供了多个项目示例，包括如何使用Python编程制作一个DJ控制器，实现音乐混音大师级作品；还介绍了安全地为树莓派供电的方法，并进行了一次全面的10页操作系统测试，帮助读者选择最适合特定任务的Raspberry Pi版本。 2. 纪念与庆祝：特别庆祝树莓派诞生5周年，通过模拟Monopoly游戏教读者智慧投资，体现了树莓派在教育和娱乐中的价值。 3. 学习与创意：杂志内含一个简单的反应式游戏制作教程，以及如何用LED构建一个温度计，引导读者通过实践提升技能。此外，还强调了终端（Terminal）在解决问题中的作用，鼓励读者熟练掌握其操作。 4. 编辑团队：编辑部由经验丰富的团队组成，包括Managing Editor Russell Barnes、Features Editor Rob Zwetsloot、News Editor Lucy Hattersley以及Sub Editors Rachel Churcher和Phil King，他们的专业知识确保了杂志内容的专业性和深度。 5. 设计与合作：设计工作由Critical Media负责，由Head of Design Dougal Matthews领导，设计师们如Lee Allen、Daiva Bumelyte和Mike Kay共同打造了杂志的视觉风格，使其既实用又美观。 MagPi56不仅是技术爱好者的重要参考资料，也是一个展示创新思维和动手能力的平台，无论你是初学者还是资深用户，都能从中找到适合自己的学习材料和灵感。通过阅读这一期，读者不仅能提升树莓派的使用技巧，还能了解到最新的技术趋势和发展动态。"

A custom motor control unit is

included. This enables you to control

the robot using Python code

BUILD AN

EASY ROBOT

Featur

uilding a robot is a dream

for many new Raspberry

Pi owners, and it’s

way easier to get started than

you think.

One of our favourites is the

EduKit 3 Robotics by Cambridge

Raspberry Jam. The kit is

Get a CamJam robotics kit and make a wheeled rover in an afternoon

MIKE AND TIM

Michael Horne and Tim

Richardson run the Cambridge

Raspberry Jam and are active

members of the Raspberry

Picommunity.

camjam.me

Beginner

EASY ROVER

Tim Richardson, the guys who run

CamJam and Pi Wars.

Inside the box, you get a

custom motor controller made

by 4Tronix (4tronix.co.uk). This

sits between the two DC motors

and a battery compartment,

which takes four AA batteries –

make sure you buy high-quality

batteries, as cheap ones often

don’t have enough juice to move

the wheels.

The kit comes with two sensors:

an SR-04 distance sensor and a

line-following sensor. The only

thing you don’t get is a chassis.

This is part of its charm, though,

as you can build a robot out of

any box capable of containing the

Raspberry Pi. It’s even possible

to use the box that all the

components come in.

What makes the CamJam

EduKit 3 better than other

robotics projects is the quality of

the instructional material. There

are ten dierent worksheets,

covering everything from building

the robot to driving the motors

and setting up the sensors.

These two yellow motors

power the red wheels and are

used to move the robot around

Two sensors are included with the

kit. A distance sensor lets the robot

stop before hitting a wall, and a line

sensor enables the robot to follow a

line drawn underneath it

raspberrypi.org/magpi

April 2017

>STEP-02

Fix the

Raspberry Pi

Attach the

Raspberry Pi to the

rear of the monitor.

Using a short HDMI

lead will help to

contain the cables.

A professional

edition uses the

DSI cable on the

Raspberry Pi.

>STEP-01

Set up DAKboard

Using a regular monitor and keyboard, set up the

DAKboard software on your Raspberry Pi. Make

sure it’s connected to your wireless network and

set up SSH so you can access it remotely.

SET UP DAKBOARD

Featur

CREATE A WALL DISPLAY

icon in the Menu bar and choose

your wireless network.

Now open the Chromium web

browser and set up an account at

dakboard.com. You’ll be taken

to the DAKboard app interface.

Before going any further, click the

Options tab in DAKboard. Click on

your account name (in the menu

to the left) and choose Account.

See the bit where it says ‘Private

URL’ – you’ll need this URL later,

so minimise Chrome for now.

Configure Raspbian

Back in Raspbian, choose Menu

> Preferences > Raspberry Pi

Conguration. Ensure that Boot

is set to Desktop and Auto Login

is ticked.

We’re going to turn SSH on, so

it’s a good idea to click Change

Password rst. Enter a new

password for your wall display so

you can access it remotely. Choose

Interfaces and set SSH to Enabled.

Finally, click Localisation and

Set Locale. Ensure that the Country

is set to your location; it’s ‘GB:

Great Britain’ by default. Click

on Set Timezone and choose the

correct time zone for your locale;

it’s UTC (which is the same as

GMT) by default.

Now we’ll hide the mouse pointer

after a few moments of inactivity.

Open Terminal and enter:

sudo apt-get install unclutter

Next, make a couple of system

conguration changes.

sudo nano /boot/cong.txt

…and add:

# Display orientation.

Landscape = 0, Portrait = 1

display_rotate=1

# Use 24 bit colors

framebuffer_depth=24

Use CTRL+O, ENTER, and

CTRL+X to save and exit Nano.

Now we want to force the

screen to stay on, and load the

Chromium browser with the

DAKboard website on boot.

Enter this in Terminal:

sudo nano ~/.cong/lxsession/

LXDE-pi/autostart

Delete the contents of the

autostart le and replace it

with this:

@xset s off

@xset -dpms

@xset s noblank

@chromium-browser

--noerrdialogs --incognito

--kiosk http://dakboard.com/

app/?p=YOUR_PRIVATE_URL

After saving the le and exiting

nano, enter sudo reboot. The

Raspberry Pi will restart and when

it boots, you will see DAKboard

running in full-screen mode

(without a mouse pointer).

The next step is to customise

the DAKboard interface. Click on

Options and use the Date/Time,

Calendars, Photos, Weather,

and News options to customise

the display.

Now you need to x your

Raspberry Pi to the rear of your

monitor and hang it on the wall.

Dan from DAKboard suggests

an IPS display: “You’ll still be

able to see it when viewing at an

angle greater than 90 degrees,”

he explains.

If you plan to wall-mount the

monitor, make sure the USB

ports face down and not straight

out (or the cables will stick into

the wall).

Dan recommends a Dell S2340L

23-inch screen. “The plastic case

is perfect for this setup,” he says.

“There’s almost no bezel on the

front, and the back cover pops o

easily, leaving the frame which I

then attached the photo frame wire

to use for hanging.”

You can nd more details on

the build on Dan’s website

(magpi.cc/2mKaDcO). DAKboard

also sells a pre-built model,

which is a monitor containing

a Raspberry Pi, for $299.

>STEP-03

Wall-mount the display

Now mount the monitor on your wall. Most

monitors have brackets available for this

purpose. You can also remove the bezel and use

photo frame wire to hang the screen.

raspberrypi.org/magpi

April 2017

The Camera Module (connected via

the CSI cable) is held in place using a

circle of foam. More duct tape is used

to hold the Camera Module firmly in

front of the eyepiece

MAKE

PINOCULARS

Featur

he Raspberry Pi Camera

Module is a great tool for

digital making. With it you

can quickly add an 8-megapixel

camera to the Raspberry Pi board.

It connects directly to the

Raspberry Pi using the CSI camera

interface, a thin cable socket on

the Raspberry Pi board.

The Camera Module is fantastic

for video and still photography

projects, such as time-lapse

cameras. OpenCV (opencv.org/)

software makes it easy to add

computer vision to your projects.

With this, you can train a

Raspberry Pi to identify objects and

react accordingly.

The PiNoculars project is

one of our favourite Camera

Module hacks.

The PiNoculars project is an excellent way to recycle an old pair

of binoculars into a high-tech zoom recording device

JOSH WILLIAMS

Josh helps run local maker

spaces (All Hands Active and

Maker Works). He builds amazing

places for people to work on

their projects.

magpi.cc/2m9A4pz

Created by digital maker Josh

Williams, PiNoculars are a regular

set of binoculars, with a Raspberry

Pi Camera module xed over one

of the eyepieces.

The Raspberry Pi is connected

to the top of the binoculars along

with a touchscreen display. The

whole assembly is powered by

a Goal Zero AA battery pack

(magpi.cc/2m9w6xr).

“I was on 18-hour road trip back

from Colorado to Michigan with my

wife, and I was restless,” Josh tells

us. “I had brought the Raspberry

Pi and Pi Camera Module along

to play around with time-lapse

photos in the mountains.”

When Josh looked at his pair of

binoculars, he had a brainwave.

“Raspberry Pi and Camera Module

and duct tape made for a crude

prototype,” says Josh.

When he got home, Josh set about

rening the build. He now has

An AdaFruit touchscreen is held

firmly in place with two rubber bands

(red and blue). This enables you to

control the device out in the field

Duct tape is used to secure the

Raspberry Pi and touchscreen

display to the binoculars

> Binoculars

Raspberry Pi

Camera Module

Adafruit

touchscreen

display

Foam

YOU’LL

NEED

Challengin

raspberrypi.org/magpi

April 2017

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