Hi. I am new in the reprap world. I can't wait to see my machine working.

I have problem with the DC extruder motor speed sensor. I am using the opto-sensor instead of the magnetic rotary encoder. The problem is I don't know where to plug it in. The electronics diagram doesn't include it.

I looked into the firmware pin assignment but none of the pins seems to be assigned to read the sensor.

Anyone using it? Is there extra software I have to type myself?

Will it work without it?

I will appreciate any help. I looked everywhere for it but unfortunately there is no information.