Quad encoder problems

[smitty505000]

Ok, I did just use the code by itself and I understand setting the variables to =0. Off to a good start

The encoders are optical with no data sheet since I pulled them out of a ball mouse. There is an emitter, wheel with 36 slots, and reciever for each encoder. They are in the same mounting positions as when the mouse was a mouse. I just chopped off the pc board behind them and attached my wires. The emitters only have 2 pins, +5v and ground. The recievers have 3 pins, A,B, & +5v. I know this because I traced them back on the mouse board before cutting. I also checked another mouse to be sure. (I bought 4 of them to play with).

With my original code (the really simple one a few posts back) nothing happened until I put in the resistors to ground. Thats the only reason they are in the circuit. The read out on the lcd also displayed channel A and B status and I could see 00 01 11 10 00 when rotated very slowly.

I did try your code without the resistors and it didnt make any difference.

I agree with you when you say we need to walk before we run. So I checked the outputs of the encoders with a logic probe. I am getting a high/low pulse out of each of the channels when they are rotated.

Smitty

[SteveB]

So I checked the outputs of the encoders with a logic probe. I am getting a high/low pulse out of each of the channels when they are rotated.

What voltage do they output on the channels? I haven't hacked any mouse encoders, so a google on that (or someone else on this forum who has could chime in) could help make sure the hardware portion is working properly.

I do know the code is working now. I scared up 2 mech encoders, and hooked them up to an 18F4620 I have. Using the internal pull-ups on port B, worked without a hitch. I see no reason it wouldn't work on the 16F628.

Steve