PCB Making: Customized Arduino & A Timer made with 555 Timer

1. Customized Arduino
A self-made ‘Arduino Uno’ tested on breadboard:

Arduino schematic drawn in Eagle:

2. An adjustable timer made with a 555 timer


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.

Failure on the Othermill machine: It didn’t clear the whole ground surface even though it should according to the Eagle file, then we found the solution of milling one more time using an exported .svg file from Eagle so that we have the “clear all” option in Bantam.

Another way of fabricting PCB is to etch using etchant solution cupric chloride. We made this together on one of xFab’s classes: