GPIO

General-Purpose Input/Output (GPIO) refers to non-specialized digital signal pins on integrated circuits or electronic circuit boards (such as MCU/MPU). These pins can be used as input, output, or both, and are controllable via software.

Preparation

• Rhino Pi-A1
• Multimeter
• Open-source tool: gpiod

sudo apt update
sudo apt install gpiod libgpiod2 libgpiod-dev

Connection

No.	Board Silkscreen	GPIO Mapping	Description
2	5V	GPIO117	After pulling the pin level high, the pin outputs 5V voltage, restored after device restart

Take the 5V PIN (GPIO117) of the Rhino Pi-A1 48 PIN as an example for testing:

• Turn on the multimeter and rotate the switch to the DC voltage 10V range gear.
• Connect the red multimeter lead to the 5V PIN (GPIO117) on the 48 PIN side of the Rhino Pi-A1.
• Connect the black multimeter lead to the GND PIN (GND) on the 48 PIN side of the Rhino Pi-A1.

Testing

• Output High Level

sudo gpioset /dev/gpiochip3 117=1

Observe that the multimeter shows a voltage of approximately 5V.

• Output Low Level

sudo gpioset /dev/gpiochip3 117=0

Observe that the multimeter shows a voltage of approximately 0V.