2014/08/16

Why Raspberry Pi is popular? -merely personal comments-

Wow, Raspberry Pi's Eben and Liz visited Taipei. RS Components held a convention in FutureWard . And I'm honored to give a talk about why Raspberry Pi is popular(successful). The following are the 20 slides I used and the brief descriptions.

Why Raspberry Pi is popular? This is a difficult question. I am not a trend expert or an experienced analyst. Neither do I have backdoor straight to the Raspberry Pi Foundation. Well, however, I'm interested in this question and try to provide some explanations. Caution: just some biased thoughts.

You got to have a goal. And the purpose of the charity organization Raspberry Pi Foundation is about education. That makes it very different.
You got to have a good team. Not only engineers, you also need to have masters accountable for other aspcts. Including an iconic figure to show on media and non-technicians to grow the community. Once set the goal and have a good work group, the rest just follows.
Naming is hard. Picking a good name is harder. It has to be unique. Well, even better to have a cute logo(icon) and a mascot. (Ubuntu, for god's sake, please abandon those bizarre codenames.)
First thing first, the product which you can hold on your hand. On the first sale day of Raspberry Pi Model B, it's a complete product. Robust, beautiful, decent, and just works. Although this should be a basic requirement, many other products out there don't satisfy.
We are not Apple who are willing to and able to control everything. So please utilize the already-built resources. When I kew that Raspbian is based on Debian, it made me relieve. Please don't make some small changes and add little new things, then call it a new name. By known familiar things, it will lower the enter barrier for the newbies.
Many hackers blamed the Foundation for not being real open. I don't think that is an issue. You have open something enough to let makers play, and not-open something to keep the profit.
From the first day, Raspberry Pi sells and distributes to the whole world. In this global villiage era, this seems not so big. However, many other boards don't.
The price of Raspberry Pi just hits the sweet point. Great!
Hardware spec is boring. Everybody likes to hear stories. Even before we could buy Raspberry Pi, there exists the blog website(and later Twitter) recording happings around it and tells us the story about the Raspberry Pi. Though the representative type of Raspberry Pi is Eben, I personally think the main driving force behind the success story of Raspberry Pi is Liz, the one who tells good stores about Pi.
What? Website? Are you kidding me? In the web version x.0 age, why should I put this as a factor of the success of Raspberry Pi? Well, please compare other boards' website, Raspberry Pi's website is just clean and elegant, period. There is no blah blah blah non-sense text. The English text is of high quality. Not too hard to read, and not too shabby such let natively-English-speakers think it's something bad.
Besides the execellent story-teller Liz, in the forum, there are also exists somebodies from the Raspberry Pi Foundation. They answer your questions, attract the early-adapters, and enrich the forum accumulating lots of Q and A. It's not an easy thing you could do it on spare time. It needs dedicated man and time.
I think the Raspberry Pi just came into a good time. The Arduino(and other microcontrollers) users want to upgrade to next level. The 32-bit ARM dev board users want something cheaper. And a lot of newcomers want to enter this area.
The above shows the main reasons I reckon as to lead to success of Raspberry Pi. The followings sometimes are the consequences of the previous factors. Sometimes are the causes of themselves, enabling them to go stronger.
Once you have a group of fans and enthusiasts, who are willing and happy to share, the community will get larger and larger. Attract makers from other camps.
Community is very import. So I put on two slides. Fans share with each other, attract more fans.
Even better, an ecosystem established. They start to build products around Raspberry Pi.
You can't just have a product and a datasheet. Please take a look at Adafruit. Pretty website listing execellent products, not only that, they provides detail tutorials and responsive forum.
The story doesn't end here. Raspberry Pi is still forwarding to the goal: education.
Thanks all. Let me stress this point again: just some biased personal opinions.

2014/08/10

Raspberry Pi情報彙整(33)

我將網路上看到的、感興趣的、跟Raspberry Pi相關的資訊收集如下。如果您發現任何新奇驚人的新聞或專案,還請留言告知。

PiCE+, a metal outdoor case for the Raspberry Pi B+ & Camera by Elson Designs — Kickstarter,防水、耐重壓的外殼。募資中,結束日期是8月27日。

Sonic Pi Competition | Raspberry Pi,平常寫第一支程式是印出"Hello World",但Sonic Pi讓你發出聲音;何不參加此競賽,試試能以程式發出多麼有趣的旋律呢。
Indian Inventor Makes A Decidedly Unsexy (But Cool) Open Source Glass Clone | TechCrunch,你相信G公司真的會保護你的隱私嗎?何不自製數位眼鏡呢。
The making of the Raspberry Pi Model B+ | Raspberry Pi Today,想深入了解Compute Moduel、Model B+、HAT嗎,想知道未來即將推出的A+嗎,看看這一篇James Adams訪談就對了。
Winners of Raspberry Pi Photography award contest 2014,Adafruit舉辦的rpi攝影大賽落幕了,欣賞一下眾人的作品吧。
Windows comes to Raspberry Pi-style board in Microsoft/Intel project | Ars Technica,嘿,這是一塊名為Sharks Cove的開發板,瞄準的主要目標應該是開發使用Intel Atom的平板與行動裝置的周邊、以及任何使用Intel Atom的Windows與Android裝置的周邊。規格相當高,但也很貴,其後續發展就讓我們拭目以待吧。
Mostly Technical: ASTROGUN!,哇,拿在手上玩的射擊遊戲。
Pi Wars | The Raspberry Pi Robotics Challenge Competition,2014年12月將在英國劍橋舉辦的機器人競賽,除了要以rpi為核心之外,其他規則請看看這裡
An image-processing robot for RoboCup Junior | Raspberry Pi,rpi加相機模組,影像辨識進行尋跡。
Raspberry Pi 與 IPS 7吋 1280 x 800 觸碰面板CAVEDU教育團隊技術部落格 | CAVEDU教育團隊技術部落格,Cavedu團隊測試一款觸控面板。
How to Assemble the On/Off Power Switch from Pi Supply | Average Man vs Raspberry Pi,如何組裝這款rpi的電源開關模組。
RasPi magazine launches today – get your free downloads here | Linux User & Developer,哇,又一本專注於Raspberry Pi的新雜誌問世囉。
How To Emulate Rare and Retro Platforms on the Raspberry Pi | MAKE,透過模擬器,rpi也可以跑很多已成歷史追憶的硬體環境與作業系統,諸如Macintosh System 7、FreeDOS、Windows 3.0、MAME、8086、Commodore 64等。
ODROID-W:第一個與Raspberry Pi相容的開發板 - Make 國際中文版,採用與rpi相同的主晶片BCM2835,也就是說與rpi硬體相容,令人相當驚訝,定價$30美元;板子比rpi要小,除了相容於原先的設計,還有額外的GPIO腳位、ADC、RTC,另外有一塊子板含有以太網路、四個USB埠、音訊插孔、UART。Adafruit拍了不少更清楚的照片,此產品的網頁在此。

其他:

2014/08/09

Raspberry Pi:如何抓圖

開機並進入X視窗桌面系統後,怎麼抓取畫面成圖檔呢?如何抓整個桌面、抓某一個視窗、抓某特定區域呢。

首先介紹一套不錯的抓圖軟體,其套件名為shutter,安裝指令如下:

$ sudo apt-get install shutter

如出現錯誤訊息,可先以底下指令試著更新套件:

$ sudo apt-get update
$ sudo apt-get upgrade

安裝成功後,便在程式選單「Accessories」裡;第一次執行需花費較長的時間。

底下便是Shutter軟體畫面,點按「Selection」、「Desktop」、「Window」便可抓取某特定區域、整張桌面、某視窗。因為圖形介面,甚為簡單,請自行嘗試。
但Shutter軟體相當腫大,對於Raspberry Pi來說,僅算堪用。接下來介紹命令列模式下的抓圖指令,其套件名為scrot,請以底下指令安裝:

$ sudo apt-get install scrot

然後介紹此抓圖指令的各個常用參數,請進入X視窗系統,並開啟LXTerminal終端機。

抓整個桌面:
$ scrot

延遲10秒後,抓整個桌面:
$ scrot -d 10

延遲10秒,並在終端機裡倒數,抓整個桌面:
$ scrot -c -d 10

指定路徑檔名、指定圖檔格式:
$ scrot /home/pi/xyz.jpg

讓你以滑鼠圈選出想要抓取的區域:
$ scrot -s

抓目前作用中的視窗(也就是終端機的視窗):
$ scrot -u

延遲10秒後,抓目前作用中的視窗(你就有時間選擇想要抓取的對象) :
$ scrot -d 10 -u

以上便是常用的參數。

scrot預設會自動設定檔名,若想自行指定,便可使用$f、$n、$p等參數;詳情與其他參數,請下參數-h來查詢。


參考資料: