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Old 2nd October 2001, 05:50 PM   #1
Freddie is offline Freddie  Sweden
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What is the easiest way to convert the gray-code output from a Bourns optical encoder to binary (parallell)?
I don't want to use a microcontroller. Perhaps there is a IC that converts from gray code to binary that I can use?

/Freddie
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Old 2nd October 2001, 09:30 PM   #2
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Lightbulb Translating to Binary

Perhaps using a simple prom/eprom device would suffice - feed the gray code output of the optical encoder (buffered to correct voltage if not 5v) onto the address pins of the prom, take the translated binary value (upto 8 bits) from the data pins.
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Old 3rd October 2001, 10:12 AM   #3
AuroraB is offline AuroraB  Norway
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Default Gray to Binary

The classical way to convert Gray to Binary is as follows:

Feed the Gray MSB directly through to be your Binary MSB.
Then make an XOR of the the Gray MSB and 2.MSB. Output will be your Binay 2.MSB.
Then XOR this output with your Gray 3rd. MSB.
Output is now your 3. MSB Binary.
Proceed with XORing each output with your next following unused Gray bit until your all done.
That's all there is to it.
On the other hand, - generating a LUT in a PROM might do it in one chip, as 8 bits will need two XOR DIPs.
One DIP will suffice up to 7 Gray bits...........
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Old 3rd October 2001, 04:18 PM   #4
Freddie is offline Freddie  Sweden
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AuroraB,

This was just what I was looking for. XOR ICs to convert from gray to binary, nice.

Thanks for the reply.

/Freddie
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