Raspberry Pi_Eng_03.6.1 WAN Connection Device, LAN Hub and Router

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3.6 Network Device

3.6.1 WAN Connection Device, LAN Hub and Router

If you want to connect your computer to a network and work with another computer, you need network access equipment. Commonly used networks include LAN networks and WAN networks.

A LAN network is a form in which a certain number of computers are connected to each other in a limited space, and a device used to connect to such a network is a LAN HUB. Through the LAN HUB, computers on the same network can exchange necessary data with each other.

Raspberry Pi_Eng_03.5 Power Adapter and Power Supply Cable

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3.5 Power Adapter and Power Supply Cable

Raspberry Pi can supply electricity of 5.1V DC power via Micro USB socket. To supply power to the Raspberry Pi, you first need a power cable that supports the Micro USB socket. It is commonly used in mobile phones, so it can be easily obtained from around, or it can be shared with mobile devices.

Raspberry Pi_Eng_03.4.2 External Mass Storage Device

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3.4.2 External Mass Storage Device

Raspberry Pi can use an SD card as a storage device, but SD cards usually have a limited storage capacity, so if you need to store a large volume of data, you need an external storage device. If you want to use such an external storage device, you need to connect it to a USB port.

Raspberry Pi_Eng_03.4.1 SD Card

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.4.1 SD Card

As Raspberry Pi is designed to install operation system on the SD card, SD card is essential.

When purchasing an SD card, the capacity should be at least 4 GB, and it is recommended t use usually 8 GB or more. In some cases, you might want to use a 16 GB or 32 GB SD card if you want to install a lot of programs or to save a lot of data on your system.

Raspberry Pi_Eng_03.2 Body Case

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3.2 Body Case

The size of Raspberry Pi body is very small. The main board is provided with four holes for fixing the main board, so that it can be fixed to another machine or equipment. However, since there is no part to protect the board itself, it can be damaged from external contact or impact. Therefore, we need a case that physically protects the board and protects the board from dust and pollutants from the outside.

Raspberry Pi_Eng_03.10 External Interface

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.10 External Interface

Raspberry Pi can communicate with and control devices outside the system through a bidirectional interface with external devices. It can receive input or output through an external device, or adjust an external device. A key device for this is the GPIO (General Purpose Input Output) port. Here, I will briefly mention the preparations required to use this GPIO. For details, refer to [Chapter 25 External Interface]:

Raspberry Pi_Eng_03.1 Selection of Raspberry Pi Model

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3.1 Selection of Raspberry Pi Model

When purchasing Raspberry Pi, you should clarify the purpose of use. If you want to use it only for a limited purpose, you can use a lower model that has a relatively low processing power. However, if you want to use it as a general purpose just like general PC, you will have to use the latest upper model that have various advanced features and high level processing.

Raspberry Pi_Eng_03.0 Chapter 3 Buying & Installing Device/Part

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Chapter 3 Buying & Installing Device/Part

Chapter’s Main Topics

Here this chapter will find out what devices are needed to operate Raspberry Pi and how to connect them to Raspberry Pi.

It includes descriptions on the following topics:
■ Selection of Raspberry Pi model

■ Body case and heat sink

■ Storage device

■ Power supply device

■ Network device

■ Input device

■ Video output

■ Camera

■ External interface device

Raspberry Pi_Eng_20.3.5 Automatic Run regardless of Run Level at Booting

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20.3.5 Automatic Run regardless of Run Level at Booting

If you want the command or script to always run regardless of run level, you register it in the “/etc/rc.local” file. The script registered here is executed only in run level “2” ~ “5” which is a normal operation status of the system.

Here is an example for the contents of the file “/etc/rc.local”.