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[on:]

Hello, I would like to use optical encoder from old HP printer (It has 4 pins, and capacitor between pin 1 and 3. Part no. 09845 Agilent 58), and count steps with Arduino Mega.
Can anyone help?
Does anyone know how to connect this encoder to the Arduino, and some code?

[Reply #1 on:]

Do you have a photo(s) of the unit you could post?

[Reply #2 on:]

I have attached a photo.

[Reply #3 on:]

Does anyone know how to connect this encoder to the Arduino, and some code?

It looks like a rotory encoder. You have to work out what wires are 5V and ground then the other two are the quadrature index pulses.
Code you can use is here:-
http://arduino.cc/playground/Main/RotaryEncoders

[Reply #4 on:]

Do I need some resistors, or not?

[Reply #5 on:]

I don't know, what signals are you getting out of it. Try first just connecting to the arduino inputs. If you can't get a reading then enable the internal pull up resistors.