The Raspberry PI can be operated without a keyboard, mouse, screen or network connection by connecting it to a PC using a RS-232 serial port.
This article uses minicom running on a Linux PC to connect to the Raspberry PI command line. A USB to RS-232 adapter cable connects the PC to the Raspberry PI RS-232 adapter board.
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Add a RS232 serial port and GPIO breakout to your Raspberry PI using this simple single-sided circuit board that you can build at home.
To keep the design simple and easy to lay out on a single sided board, only 5 GPIO pins were connected to a socket strip – this is fine for initial experimentation. The serial port allows the Raspberry PI to be connected to a PC without the need to connect a keyboard and screen to the Raspberry PI.
Go to the article on the Raspberry PI serial port and breakout board to see the circuit diagram and source files in KiCad format.
In this article, a program written in the Processing language is used to determine which port the Arduino or other USB serial device is plugged into on the computer. The article contains the source code for the sketch which can be run on Linux, Windows and Mac.
The application waits for the Arduino to be plugged into a spare USB port on the PC and then notifies the user what the port name is with a message in the application window.
In this tutorial, the Arduino displays the time and date on a LCD (optional) and in the Arduino IDE serial monitor window. A PCF8563 real time clock (RTC) IC is used to generate the time and date.
The Arduino Clock Circuit on Breadboard
Tutorial 15: The Arduino reads temperature from a MCP9700 temperature sensor IC and displays the temperature in the Arduino IDE serial monitor window.
Arduino Serial Thermometer Breadboard Circuit