Re: Recommendations for a Quadrature Decoder IC or MicroController

benn wrote:
I have an atmega16 that interfaces to a motor with a quadrature
encoder sensor. Turns out the frequency of the pulses are much more
than my little 4Mhz can handle (the micro does other things as well!)
As a result, the motor control isn't very accurate, nor does it react
very fast.

SO.. I'm looking for either a quadrature decoder IC that can take the
load off (will calculate position/velocity and interface to a host
micro via serial/parallel bus), OR, a beefy microcontroller with built-
in decoders (and pwm output). 32-bit with lots of GPIO is ideal if
going the microcontroller route.


If you can use the SPI port, try the LS7366 quadrature counter.

I have used this on my micromouse:
http://www.micromouseonline.com/blog/tag/ls7366/

I use a d*** but it will work just fine with the AVR.

Very easy to use and almost certainly fast enough.

Data *** here:
http://www.lsicsi.com/pdfs/Data_Sheets/LS7366R.pdf

Pete Harrison
www.micromouseonline.com
.

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