Encoder program

ShinXIII

I used HEDS-5700 Series Panel Mount Optical Encoders to connect with BASIC stamp, but stuck in the programming part.
I need it to give me some values about the turning angles of the vehicle. It seems damn difficult to me...
I tried to get the values of Channel A and B when it turns, which i get the following result:

Channel A: 1· 0 ·0 ·1
Channel B: 1· 1· 0· 0

I tried to compare values from both channels and with their previous value to find out the encoder is actually turning clockwise or anti-clockwise.
But it seems that the program failed which gave me no change in the values.
Hope could have someone to enlight me a bit.

P.S. My program was written with reference to the DigitalEncoderDoc.pdf

Brian_B

ShinXIII,
I'm not the best person to answer this but being no one else has touched it I'll try and help. I don't think this basic stamp is the best choice of micro to use with and encoder ,the sx would work better and there is a sample program in sx basic that does just that.
There is a little trick thought that you can use with the basic stamp, you take a d-flipflop and hook A channel to SET and B channel to RESET. When you turn the encoder one way OUT will pulse , when turned the other way NOT OUT will pulse. this is a cheap and quick way to tell what direction the encoder is turning . I wish I could be of more help.

Brian


Edit: I went and checked on the flip-flop thing ,seems my memory on how it worked was wrong . Here is a link of how to do it the right way.

http://profmason.com/?p=775

[noparse][[/noparse]http://profmason.com/?p=775]

why don't www links work anymore?

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"Imagination is more important than knowledge..." Albert Einstein

Post Edited (Brian_B) : 2/7/2010 6:02:24 PM GMT

erco

Your quadrature encoder is working properly. Google & Wiki are your best friends.

http://en.wikipedia.org/wiki/Quadrature_encoder

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·"If you build it, they will come."