A Nice DIY Spin Coater Build

In this video I design and build myself a Spin Coater... a tool which is used to deposit thin films as thin as a few dozen nanometers! Truly nanotechnology at home! Some design files, stl files, schematics, code and the rest can be found on my GitHub and Printables pages
GitHub: https://github.com/BirdbrainEngineer/Spin-coater-v1
Printables: https://www.printables.com/model/658943-diy-spin-coater

Some extra points to note about this spin coater... It's not the greatest spin coater out there... the biggest problem I found is that the PC fan I used is kind of bad. When hitting the minimum duty cycle (which is 10% rather than the advertized 5%), the speed always spikes up to nearly 2000rpm... so it's unfortunately impossible for me to do a slow acceleration. I think a better way to do it would be to use a 3-pin fan and control the speed by directly using the PWM on the power of the fan... I'm just not sure what that would do to the tachometer signal.
Music:
(0:00 - 0:47) The Plan's Working - Cooper Cannell: YouTube Audio Library
(0:48 - 1:57) Smooth Waters - SergePavkinMusic: https://www.youtube.com/watch?v=lxhxWw4kl2Y
(2:00 - 4:00) Drift Ashore the Dreaming Island, Link's Awakening
(4:01 - 6:07) Gerudo Valley, Legend of Zelda - (Cover) Luke Pickman -- / instrumentmaniac: https://www.youtube.com/watch?v=sX3XVwMnW7I
(6:10 - 7:32) Kokiri Forest, Ocarina of Time - (Cover) The Noble Demon: https://www.youtube.com/watch?v=avJMmEPiLfM
(7:46 - 8:22) Sci-Fi-Dramatic-Theme - Twisterium
(8:34 - 9:47) Tittle Screen - Sawsquarenoise
(9:51 - 10:45) Investigation, Phoenix Wright Ace Attorney: Justice for All
(10:47 - 11:53) Main Theme, Final Fantasy III
(11:56 - 13:55) Wind Scene, Chrono Trigger - (Cover) Malcolm Robinson Music: https://www.youtube.com/watch?v=pUFELL5hHbg

=|Chapters|=
0:00 - What is a spin coater?
0:47 - Spinner assembly
1:57 - Microcontroller and speed control
6:09 - Tachometer
6:46 - Peripherals
7:10 - Finalizing hardware design
7:54 - Software
8:15 - Assembly
9:49 - Usage
10:45 - Testing
14:00 - Files and Thank You

Видео A Nice DIY Spin Coater Build канала Birdbrain