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:
![](https://freight.cargo.site/t/original/i/c05f8aa3ddabc11a437dea9c2f6c8dc7d90b6dca6272c2a94863f38a0d0e43be/2022-03-16-12.40.53.png)
![](https://freight.cargo.site/t/original/i/fa5380bca7b4ae3bb7f5f698f22acbc8b2623c443aaefe041412e94e2511cb84/2022-03-16-1.10.15.png)
![](https://freight.cargo.site/t/original/i/6bcbcd3d639e0b8f452d108adbb639d5a1623122db1a047fc6925a1deab168ad/IMG_2765.jpeg)
![](https://freight.cargo.site/t/original/i/7d3ade8377dfc83681612b085a1c44766bdf4b361e0508cc72a4eebe0a1d2fd1/IMG_2796.jpeg)
![](https://freight.cargo.site/t/original/i/72defa160418ea58fc5ac86a7d82a895d0060b940ab31a502fe17352b631eb3b/IMG_2791.jpeg)
2. An adjustable timer made with a 555 timer, 12/2022
3. Attiny85 Controlled Joule heating circuit
![](https://freight.cargo.site/t/original/i/be299af4a25b4439d631f36ebd2509959595dc71aabbc784dbebe2aa9c2d0923/IMG_6103.jpeg)
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.
![](https://freight.cargo.site/t/original/i/bfa8afcf32e7ab3b09a69822dfc55977ba6e684a739c4027b28883d2146b6372/2022-02-17-3.47.09.png)
Self fabricting PCB acid etched using Ferric chloride, made this in xFab’s classes:
![](https://freight.cargo.site/t/original/i/d49f9ce0a07315fd78dee9597ddc015ab28a2756a4cf776632d84b71aff2133f/438A7809-6202-437D-AAB6-3742D74622BE_1_105_c.jpeg)
![](https://freight.cargo.site/t/original/i/68e0973cf61816aa1738ff37984b174101482cd341d365077e50e10d5eef46b9/1FF7F87A-7ACD-4AB5-B146-9629F37A71CB_1_105_c.jpeg)