3.7.2 Mouse
Raspberry Pi works well without a mouse connection. You may not need a mouse when using Raspberry Pi for a special purpose. You may also not need a mouse to connect to Raspberry Pi only via the network. However, it may be convenient to use a mouse when you need to purchase Raspberry Pi and install the operating system or install applications.
3.7 Input Device
3.7.1 Keyboard
Raspberry Pi works fine even if keyboard is not connected. Keyboard may not be necessary when you connect and use Raspberry Pi to a machine or facility or for other special purposes. Also, when connecting to Raspberry Pi only via network, you may not need a keyboard either. But when you need to purchase Raspberry Pi and install an operating system or install an application at first, you have to connect a keyboard.
3.6.4 Bluetooth Adapter
Bluetooth communication is usually used for mobile devices such as mobile phones to connect directly to a computer at a short distance, not through the network, to listen to music or videos, and to upload or download files. If you want to connect to a computer wirelessly using Bluetooth communication, both computers connected to each other must support Bluetooth function.
3.6.3 WI-FI Adapter
If you do not want to connect a specific computer to the network by cable and want to connect wirelessly, both the computer and the network access device must support the Wi-Fi function.
Figure 3‑6 WI-FI adapter
If you want to connect to the network using Wi-Fi in Raspberry Pi, you need to have a device that supports Wi-Fi network in Raspberry. The newest model, the Raspberry Pi 3 model B, provides Wi-Fi as standard, so you do not need to prepare a separate device, but if you want to use Wi-Fi on the previous model, you can buy Wi-Fi parts that support USB port . There are various types of USB Wi-Fi available on the market, so you can buy your favorite items.
3.6.2 LAN Cable
It is LAN cable that connects the computer to the network equipment by cable. To connect Raspberry Pi to a LAN network, one end of the LAN cable is to be connected to the Ethernet port and the other end to the LAN HUB.
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.
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.
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.
.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.
3.3 Heat Sink
Raspberry Pi adopts the ARM processor. The power consumption of these CPU, GPU, etc is very low, and there is almost no heat in normal operating environment, so Raspberry Pi is designed from the beginning so that it does not need extra cooling function like cooling fan.