rdmotors

Audioguru Funny you should say that I am using lots of the parts from the printers for the unit including the stepper motors, slides, slider rods, and other pieces. I did leave the laser alone though, from the laserjet since I tought it wouldnt be powerful enough. ;D I will look for the circuit and see what I can come up with. I do have a few mice I could use and see if I could gear drive the wheel but the problem I have is the actual circuit for that. I would want this to send the signals straight to a readout and not into my controller (computer). I have seen articles on this before but no where near what I would need to be able to follow it. In the mean time I will look for the other circuit and see what I can come up with........

I have two questions in this area of digital readouts: 1) Is there a project here that uses old pc mice parts to create the signals for a DRO? I have noticed that HP printers have a marked tape behind the print head. It uses an optical device in conjuction with this, I guess for location, so secondly: 2) Could this be used to create signals for a DRO? I know I will be limited by the length of the tape for reading purposes, but my mill that I am building is small. Being my first one I want to try and test it all before moving up to a bigger unit. I hope to use the first unit to build the next. Since it will help me cut a straight line and make a hole perpendicular or parallel to that line the second machine should be better. I have the mechanical ability to design and build just not the ability to do it square or straight. I hope this first project will correct my inaccuracies and help me learn more about the electronics of it all. So next time I can build that better "mouse trap".

My question abou this circuit is: Why are the input lines to the ic have 5v resisted supply on them? The restistors I am talking about is RP1-3. it would seem that you would back feed power into your lpt port? Or am I way off base?