PCB Making: Customized Arduino(Atmega328)/Attiny85/555 Timer circuits



1. Customized Arduino, 12/2021

An ‘Arduino Uno’ tested on breadboard:

Arduino schematic drawn in Eagle:








2. An adjustable timer made with a 555 timer, 12/2022



3. Attiny85 Controlled Joule heating circuit





Failures🤣


The previous version with FTDI chip(USB to TTL converter), however, the chip was out of stock so I just abandoned the idea of intergrating it on borad.




Self fabricting PCB acid etched using Ferric chloride, made this in xFab’s classes: