Quad encoder problems

[smitty505000]

I just did a little more testing and found that the photodiode reciever has a ramp up and a ramp down on the voltage. If turned to fast the voltage stays high. I do not think it is as easy as on/off pulses. That could explain the eratic behavior. If this is correct then I need to measure freq along with the change right? Or am I going in the wrong direction.

I am looking at another alternative. A pair of mems 360deg inclinometers with spi output. Here:
http://www.analog.com/en/prod/0%2C28...6203%2C00.html

I ordered a couple of the pcb samples

I love samples

I have a couple of 16f876 lying around and they have spi.

[mister_e]

if you don't need a 360 degree, a simple POT may do the job.
A mechanical or optical encoder will work as well.
Some photo detector (taken in VCR, Tape deck or else) like GPIA70R (if my memory is good) have to work AS-IS