system_structure.md

System Structure

This section describes the hardware and system architecture of the PiRacer & the Head Unit.

Componentens

The following tables displays all components and its datasheets that are used for this project.

Car	Gamepad	Dashboard	Head Unit	Raspberry Pi	CAN Hat	CAN Hat	Arduino Uno	Speed Sensor
PiRacer Base	ShanWan Wireless Gamepad	Waveshare 9inch DSI LCD	Waveshare 7inch HDMI LCD	Raspberry Pi 4	RPI 2CH CAN HAT	Arduino Uno 1CH CAN HAT	Arduino Uno	LM393

Assembly

This is how the assembled PiRacer looks like:

Wiring

The following tables are showing the wiring & connection of all Componentens.

Sensor Sensor @ Arduino Uno

LM393	Arduino
VCC	5V
GND	GND
OUT	D3

Arduino Uno @ Arduino Uno 1CH CAN HAT

The CAN HAT can directly be mounted on the Arduino Uno.

Arduino Uno 1CH CAN HAT @ RPI 2 CH CAN HAT

Chanel 1 (L & H) is used for the CAN communication between the Arduino Uno CAN HAT and the Raspberry Pi CAN HAT.

PRi @ RPi 2 CH CAN HAT

The CAN HAT is connected to the Raspberry Pi 4 via the SPI interface.

RPi @ PiRacer Drivetrain

The drivetrain of the PiRacer is connected via I2C with the Raspberry Pi 4.

RPi @ Head Unit

USB for touch input and power supply as well as HDMI for the video input are used to connect the Raspberry Pi 4 with the Head Unit.

RPi @ Dashboard

The LCD Display is connected on the Raspberry Pi using the DSI connector.
The Power (5V) is supplied via the GPIO pins.
I2C is used to get the touchscreen input.