The article on flashing an LED using the Raspberry PI and Python language shows how to blink an LED on and off using a Python program running on the Raspberry PI.
The article on flashing an LED using the Raspberry PI and C programming language shows how to blink an LED on and off using a C program on the Raspberry PI.
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.
An op-amp is used as an oscillator in this LED flasher circuit. This is another circuit that can easily be built on an electronic breadboard by beginners in electronics. Click the above link for the circuit diagram.