Rotary encoder or: How to build a digital servo using an Arduino and photo sensors

Table Of Content:

00:05 Introduction
00:23 Photo sensor
03:35 Sensor disc
05:49 Directional encoder
08:27 Agular resolution
09:53 Motor control
11:24 Steppermotor
14:36 Proportional control loop
16:31 Pulses per second
18:31 Motor parameters
19:37 Angular resolution / small servo
21:22 Ocilloscope plot rotary encoder
24:29 Printer motor
25:50 Linear drives
26:48 Digitale servo from a wiper motor

The project page:
http://www.HomoFaciens.de/technics-base-circuits-encoder-disc_en_navion.htm