Possible extension to decode 32 rotary encdoer with 74hc4067? #43
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Hello Everyone
Would it be possible to decode 32 rotary encoder with 74HC4067 multiplexing method using the library encoder tools?
I found this explanation on the teensy forum but I would like to have more details on how to do this :
"Actually, to expand the 4067 based solution to 32 encoders you only need an additional inverter (or transistor) to get a 5th address line (S4). you can directly connect the outputs of the 4067 without additional logic. From the library point of view the loop clocking in the encoder signals needs to be extended from 16 to 32 loops. That should be all. So, this would be quite trivial. If you extend that to even more encoders you will ultimately run into timing problems as shown above. The 4067 gets significantly faster when you power it with 15V. If you keep the encoder pullups at 3V3 you should be safe with the input voltage to the Teensy."
Thank you in advance for your answer
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