Raspberry Pi 8110714 Manual

Raspberry Pi Ikke kategoriseret 8110714

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Bringing Cellular Networking Connectivity to Raspberry Pi and Arduino

Posted by on Wed, Feb 26 2014 Designspark Magazine

SparqEE is a California-based company that has

come up with the concept of a tiny cellular

development board that provides the opportunity

to developers to add worldwide wireless

coverag . Initially launched back in August via e

the Kickstarter crowd-funding programme, the

CELLv1.0 enables worldwide wireless Internet

access for projects using Arduino and Raspberry

Pi platforms. Although Bluetooth and WIFI oﬀer

high-speed data transfer, relatively speaking,

there are clear limitations in terms of distance, operating over a few meters or a few

tens of metres; whereas cellular enables signiﬁcantly greater range and is ideal for

‘small data’ projects that need to operate over distances such as a few streets or a

town or even a country away.

Measuring only 36 x 42 x 7mm, the CELLv1.0 is currently the smallest, least

expensive and easiest to-use cellular module on the market for popular development

platforms. The device uses 2G/3G technology, meaning that it will primarily use 3G

worldwide and will only employ 2G where 3G connectivity is unavailable. Clearly, a

SIM card is required to communicate over a cellular network and the CELLv1.0

allows any SIM to be used, such as that from a mobile phone or a pre-paid SIM.

However,SparqEE can also provide low-cost SIM cards via its website that works

pretty much anywhere in the world.

Applications

The increase in range permitted by cellular communications enables a number of

potential applications for developers. Given bandwidth constraints versus say WIFI

or Bluetooth, suitable project are more likely to be sensor-based low-

bandwidth-data projects that will send low amounts of data over the Internet.

Connected to the developer’s favourite development board such as the Raspberry Pi

or Arduino, example projects could be relatively simple ones like remote help

devices to open a door,turn on a light or the power for an air-conditioning unit or

setting an alarm in a remote oﬃce. Another project could be creating a vehicle

tracker that allows car owners to know where their vehicle is directly from any

smartphone or computer, or possibly even adding a ‘kill switch’ in case the vehicle is

stolen. The same basic idea could be applicable to making a tracking device for a

dog or another pet. More ambitious and grander projects could include ﬂying a small

solar-powered remote-control helicopter across town with a camera to make aerial

movies and shoot cityscape pictures; or using remote sensor networks to provide

early warning systems by monitoring bridge harmonics for evidence of impending

danger, or heat signatures in a forest for ﬁres, or sea levels oﬀ the coast looking for

ﬂoods or tsunamis.

Making Cellular Easy

As there are many potential stumbling blocks in cellular technology for developers to

consider, the company provides help along every step of the way to easily get data

from a device. For example, as cellular connectivity via the CELLv1.0 is over the

Internet, data servers will need to be set up. Developers can of course set up their

own servers to use the CELLv1.0, but very helpfully SparqEE is also providing freely

available servers via a standard RESTful implementation and also provides

examplesfor enabling this feature. All this enables users to easily get data from a

device, through the cloud, and back out to a computer, smartphone or any Internet

enabled device, see ﬁgure 1. A completely open-source project, also included in the

CELLv1.0 package by SparqEE along with the board, antenna and power cable are

open-source development aids including code, schematics, PCB ﬁles including

EAGLE and DesignSpark PCB formats, design ﬁles, examples,pictures and other

useful facilities. SparqEE also provide a forum on its website at www.sparqee.com

dedicated to projects from developers.

Originally, when launched via Kickstarter, the CELLv1.0 was a two-piece design

consisting of a cellular and a breakout/jumper board. However, the new design is a

single-board design, shown in Figure 2, which has been simpliﬁed to a USB cable to

supply the power and using the appropriate Arduino or Raspberry Pi shield. In the

move to the single-board design, all that was required essentially was four

connection wires:TX, RX, ground (GND) and voltage reference (Vref),allowing usage

Produkt Specifikationer

Mærke:	Raspberry Pi
Kategori:	Ikke kategoriseret
Model:	8110714

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