Codewheel Generator

http://www.mindspring.com/~tom2000/Delphi/Codewheel.html

Arduino IR signal detector

Materials

1. 10k Ohm resistor
2. IR Phototransistor
3. Hookup wire

Circuit Layout (refer to Drawing)

Simply connect the Phototransistor and Resistor in series.Connect the emitter pin of the Phototransistor (long leg) to GND and the collector pin (short leg) to the resistor which we will connect to the 5v pin of the Arduino.

Analog pin 0 needs to read the voltage drop across the Phototransistor so connect the A0 pin to the Phototransistor's collector pin.

Multimeter tutorial

Components

Phototransistor (IR emitter) 
high responsive one

Infrared LED

Resistor

Transistor 2N7000
MOSFET - is a type of transistor used for amplifying or switching electronic signals

A schematic for connecting Clock motor's signal to led
Another schematic for connecting phototransistor to arduino
Make a communication between phototransistor and the led
It is a way to give signal to stepper motor.