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Old 23 January 2013, 13:32   #5
Loedown
Precious & fragile things

 
Join Date: Feb 2009
Location: Victoria, Australia
Posts: 1,946
If mice work on the principle of pulses per mm then if you insert two 4040 binary clock divider between the X and Y signal you can then decrease the sensitivity by a factor of 2 each time, or a more elegant approach would be to use a smaller PIC with code to set a few modes, so you could have say 10DPI for really fine work or 200DPI for games with a switch to select on the fly with the internal EEPROM of the chip holding the custom values.
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