How does mechanical mouse work ?

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magnetra

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Mouse

I opened up my mechanical mouse(the one using roller) to see how it worked. I saw that there were two orthogonally placed toothed wheels which rolled with the mouse. THe toothed wheels were placed in the path of an IR Rx/Tx.
Now I couldn't figure out how the system decided whether the mouse is moving up or down, or right or left. THe mechanism I saw doesn't seem to have provision to decide the direction?

Mαgηετσα
 

Re: Mouse

I think tha the direction is stablished because there are 2 IR sensors per Wheel.
 

Re: Mouse

yes with 2 sensor for each wheel we have 4 state.
in forward direction sequence is: 00-10-11-01- 00-....
and reverse direction : 00-01-11-10- 00-....
it seen that seuence follow gray code!

Regards
Davood Amerion
 

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