I'm using an older scanner as a box to create a UV PCB exposure box. I'll go through all steps of the hardware and software design emphasizing more to software logic. You will find all the resources on Github, including all of the design files.

• Links:

Blog: https://lytrax.io/blog/projects/diy-uv-exposure-box
Github: https://github.com/clytras/CL_UVScanner

• Library Dependencies:

Tim Eckel Arduino toneAC: https://bitbucket.org/teckel12/arduino-toneac/wiki/Home
CL_RotaryEncoder: https://github.com/clytras/CL_RotaryEncoder
CL_Button: https://github.com/clytras/CL_Button
TM1637Display: https://github.com/clytras/TM1637Display

• Music notice (NC):

Mellow Acid by CyberSDF https://soundcloud.com/cybersdf
Creative Commons — Attribution 3.0 Unported— CC BY 3.0
https://creativecommons.org/licenses/by/3.0/
Music promoted by Audio Library https://youtu.be/l1WXwkPDPGI