>
>
> Can anybody tell me how to read out a Rotary encoder with a pic (16f84)??
>
The easiest way (in my opinion) is to feed one of the two outputs (I
assume its a quadrature type) to B0 and the other one to any other
input (probably B1).
Set the B0 input to ext interrupt enabled .
Whenever an interrupt is detected by an edge presenting itself (rising
or falling .. its all programable) a movement of (pulses-per-rev
divided by 360) deg has been made and if you read B1and there is a
1 there the encoder turned one way, if a 0 then it turned the other.

If no interrupts are available (B0 is the only ext one) then you will
need to poll one input and read the other on a change.... instead.



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Lance Allen
Technical Officer
Uni of Auckland
Psych Dept
New Zealand
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