larwe wrote:
On Sep 22, 10:42 pm, Steven <diespamm...@killspammers.com> wrote:If there is a way to covert the port to a serial, there is a Serial to USB, then any wireless USB mouse with a receiver could be used.Well, no it couldn't, because (leaving aside the fact that a serial- USB converter will be DEVICE-side, not HOST-side USB, therefore will not connect to a USB mouse's receiver - this is an instant show stopper), a mouse gives relative position data, not absolute. The simplest path I can see is to take a proportional RC system and hack the receiver outputs to convert the PWM (servo drive signal) to a simple analog voltage. It MIGHT be as simple a matter as a low-pass filter and a voltage divider, but I suspect not.
Actually, it needn't be much more complicated than that. The servo PWM pulses vary from about 1 ms. to about 2 ms., so you'd need measure the duration of each pulse (just filtering would probably slow down response too much) and convert that timing variation into a resistance variation of a few ohms to about 150kOhms (an FET would be fine for that, or you could just do a table lookup for a current value to source to the timer input). I'd expect a small microcontroller would be the easiest way to do the conversion these days. A couple of built-in DACs would make it pretty simple. -michael NadaNet 3.0 for Apple II parallel computing! Home page: http://home.comcast.net/~mjmahon/ "The wastebasket is our most important design tool--and it's seriously underused."