ADEEPT PiCar-Pro, Manual

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6.2 Introduction of OLED Screen
OLED (Organic Light-Emitting Diode), also known as organic electric laser
display, organic light emitting semiconductor (Organic Electroluminesence Display,
OLED). OLED is a kind of current-type organic light-emitting device, which
produces light by the injection and recombination of carriers, and the luminous
intensity is proportional to the injected current. The PiCar Pro robot uses an OLED
screen to display the expressions or some parameters of the robot. OLED Screen is a
commonly used module on robot products. Due to the black non-luminous feature of
OLED Screen, this type of screen has extremely high contrast. Even if the ambient
light is strong, you can see the information on the OLED Screen clearly, and the
power consumption is relatively low. We only need to connect the power supply and
the GPIO port to control it.
If you want to use OLED Screen, you need to use a 4-pin cable with anti-reverse
interface to connect the OLED screen to the IIC interface on the Robot HAT.
If you do not use Robot HAT driver board to connect with Raspberry Pi driver
board, then you need to connect Vin of OLED screen to 5V or 3.3V of Raspberry Pi,
and connect GND of OLED screen to GND of Raspberry Pi. Connect SCL of Robot
HAT to SCL of OLED, and SCA of Robot HAT to SCA of Raspberry Pi. Please refer
to the pin definition diagram of Raspberry Pi for specific pins.