Optical Tachometer build for LongMill CNC

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-an-Arduino-based-Optical-Tachometer-to-a-CNC-R/ 3D printed files can be downloaded at cults3d.com https://cults3d.com/en/3d-model/gadget/cnc_rpm_gauge Light Ring shown in video: https://cults3d.com/en/3d-model/tool/router-lights 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