I would like to hijack the scroll wheel circuit in an old mouse, so that I can connect external devices and use them to tune the VFO in PowerSDR.
Does anyone know how the scroll wheel circuit operates in a Logitech mouse? I would have thought that there would simply be two optical paths that would give quadrature drive signals, but probing around with my scope, leads me to believe that it is much more complex than that. There seem to be bursts of 6 us pulses regardless of whether the wheel is being operated or not. When the wheel is operated, other pulses appear in the gaps between the bursts. Does anyone know what this is all about? 73, Greg, ZL3IX _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kb.flex-radio.com/ Homepage: http://www.flex-radio.com/
