Building a Optical Tachometer for the Longmill CNC router to accurately know the speed of the routers spindle.
The concept can work on any rotation object so this build could be used for more then just a router, adjustments would just need to be made to the arduino code for speed ranges.

This build is based off of the instructions found here.
https://www.instructables.com/id/Add-...

3D printed files can be downloaded at cults3d.com
https://cults3d.com/en/3d-model/gadge...

Light Ring shown in video:
https://cults3d.com/en/3d-model/tool/...

Electronic parts:
Arduino Nano = https://amzn.to/2HsoQ7R
LED's = https://amzn.to/2UYvURE
OLED screen = https://amzn.to/31YsZtL
DC to DC converter = https://amzn.to/31YsUGo

Music by www.Bensound.com