Short video demonstrating a very simple timer build with PIC16F18313 microcontroller. For more: https://diyfan.blogspot.com/2023/08/very-simple-timer-with-pic16f18313.html
Short demo of PIC16F818 driving a 4 digits 7 segments LED display with TM1637 driver
For more info click there: https://diyfan.blogspot.com/2022/01/driving-4-digit-7-segments-tm1637.html
This is an old computer CD drive converted to a shaker for faster PCB etching. The liquid in the video is water, but in real use it should be FeCl3 or other etchant. For more details about the project go to my blog: https://diyfan.blogspot.com/2022/12/shaker-for-pcb-etching.html