2.5.4 3.5mm Audio Jack and Composite Video
The Raspberry Pi offers a 3.5 m audio jack to support stereo. When using HDMI output from Raspberry Pi, audio output can also be transmitted to the HDMI port together with video output, so that external device can play video and audio at once. However, if separate audio output such as a speaker and a headphone is required, audio may be outputted separately through an audio jack.
2.5.3 DSI Display Port
Raspberry Pi supports DSI (Digital Serial Interface) connection to support TFT-LCD display. When connecting the device, you can connect it to the DSI display port protected by a plastic layer over the SD card slot on the top of the printed circuit board.
In addition, in order to use Raspberry Pi with a touch screen without a keyboard or mouse, touch-screen drivers that support 10-finger touch and on-screen keyboards is integrated in the latest version of the Raspbian operating system.
2.5.2 CSI Camera Interface
Raspberry Pi can use a regular USB camera, but it has a device for Pi-only camera. You can connect a dedicated camera with a short ribbon cable to the CSI camera port on the board. The CSI port is connected to the ISP (Image System Pipeline) in SoC of Raspberry Pi. ISP processes the incoming camera data and converts it into image or video. Using this camera, we use 250mA of current.
2.5.1 HDMI Video Port
In the past, VGA/DVI monitors were widely used video devices, but most modern monitors support High Definition Multimedia Interface (HDMI), which displays high-resolution images. The Raspberry Pi is designed to use Full HDMI output with full HD 1920×1080 resolution as the primary video output, and comes with an HDMI port to support it as a standard.
2.4.2 Current Consumption by Device
Raspberry Pi has a limited current that can be supplied to the entire USB port. Raspberry Pi 1 model A, A+, B can supply up to 500mA of current to all USB devices. Raspberry Pi model 1 model B+ and Raspberry Pi 2 model B can supply up to 600mA/1.2A current to all USB devices, which can be switched according to the firmware setting. The Raspberry Pi 3 model B has been improved to provide up to 1.2 A current to the USB port, allowing you to connect more USB devices which requires much current directly to Raspberry Pi compared to the previous models.
2.4 Power Supply
2.4.1 Micro USB Power Supply Port
Raspberry Pi supports Micro USB socket to power the system. Micro USB sockets are a common standard for charging mobile phones and mobile devices.
The power supplied to the system is using a 5.1V DC power supply. How much current is needed in Raspberry Pi depends on the type of Raspberry Pi model and number of peripherals connected to Raspberry Pi.
2.2 SoC, CPU and Memory
● System on a Chip(SoC)
Raspberry Pi is a System on a Chip (SoC) type computer. System on a Chip (SoC) refers to the way in which all electronic components required for computer operation are concentrated on one chip. In this method, the CPU, GPU, USB controller, RAM, Northbridge, Southbridge, and other components are compressed and bundled together on one chip without installing separate chips.
2.1.2 Characteristics Comparison of Raspberry Pi Model
● Characteristics of Raspberry Pi 1 model A and Raspberry Pi 1 model B
device
Raspberry Pi 1 model A/A+
Raspberry Pi 1 model B/B+
SoC
Broadcom BCM2835
Broadcom BCM2835
CPU
700MHz Single-Core
ARM 1176JZFS
700MHz Single-Core
ARM 1176JZFS
2.1 Hardware Configuration of Raspberry Pi
2.1.1 Basic configuration of Raspberry Pi
The hardware of Raspberry Pi has depends on the model, but the basic framework maintains the same structure as before. However, as the popularity of Raspberry Pi has increased recently, and the requirements for higher performance and various functions have been raised, and thus usage area has been expanded, hardware configuration of the latest model is slightly changed to support higher performance and add new functionality.
1.2 Features of the Raspberry Pi
● Small size
Raspberry Pi is a System on a Chip (SoC) type computer. System on a Chip (SoC) refers to the way in which all electronic components required for computer operation are concentrated on one chip. All the functions are installed on one board and additional work for installation or assembly is not necessary. And it is a completely working computer by itself.
Raspberry Pi is a very small computer with the size of a credit card. It can be easily attached to other machines or equipment if necessary, and it is also very easy to carry because of its small size.