The code for this how-to is a kind of hello world program using LEDs. The code for this is hosted on Github, you can follow along with the blink.c file for the PIC16F887, PIC16F688, or PIC12F675.

There are plenty of utilities out there to control keyboard LED indicators, but I'm rather interested in controlling the power LED on my headless 1U rackmount. While theoretically there are tons ...

The Raspberry Pi Pico 2 is equipped with an LED that can be controlled by a program, so we will actually write an LED blinking program to the Raspberry Pi Pico 2 and make it blink.

He built an M.2 compatible LED matrix that adds a little light to your motherboard. [bitluni] built a web tool for sending images to the matrix.