Quadrature Decoder Issues

[user 10827]

Hi Guys,

I am playing with rotary encoders and using this circuit, with this rotary encoder from RS  http://uk.rs-online.com/web/p/products/6928468/?searchTerm=692-8468&relevancy-data=636F3D3126696E3D4931384E525353746F636B4E756D6265724D504E266C753D656E266D6D3D6D61746368616C6C26706D3D5E5C647B337D5B5C732D2F255C2E5D5C647B332C347D2426706F3D313426736E3D592673743D52535F53544F434B5F4E554D424552267573743D3639322D383436382677633D4E4F4E4526

So i have built the circuit as is in the drawing.

The problem is the output from the D-type is pulsing with a turn in either direction, where it should be either high turning in one direction or low turning in the other.

Has any one got any advice on perhaps how to do it in a better way? Am i using the correct type of encode?

Pete

 

[sahib]

Pete,

De-bounce the encoder outputs using 14490 as recommended in the data sheet.

 

[user 10827]

:-[

ahh, yes that would help, reading the data sheet.

Thank you

 

[radardoug]

Are you feeding this into a micro? You can do the decoding direct in the micro, very simple.

 

[Rochey]

14490 is a rip off.

Sorry, I know that sounds harsh, but for the function is does - it could be done in a $0.50 microcontroller, plus a lot more.

There's buckets of code for dealing with rotary encoders too.

 

[user 10827]

Indeed - after seeing the price of a 14490 I have now got some code in a pic working just fine...

 

[Rochey]

wonderful.

MSP430 would have been preferable, but I'll forgive you this one time.

 

[user 10827]

Ha...I've only just worked out BASIC let alone C++!

One day perhaps...

Pete

 

[sahib]

If you told me you were controlling it from a micro I would have told you to de-bounce it in the code.  But good to see it is working.

 

[user 10827]

ahh well it changed along the way you see, at the time of posting I thought the above circuit would interface with my PIC, but then when I looked into it further it turns out you can attach the rotary direct..genius!

I am only just getting into programming but it is awesome, the amount of flexibility it gives is fab..

Ill post up my project when im a bit further down the line..

thanks Men, good to know I can call on you guys if needed..

are you familular with PICAXE at all?

Pete