It would be nice if keygrabber actually showed analog input levels, instead of just indicating which input is being exercised. I think this problem is either with Keygrabber, or Mach3. I did try hooking up one side to ground, and it still worked, but the results were very strange. Check around at all the info on joystick/gameport interfacing, and you'll see that. The pot resistance is read by the length of time it takes a capacitor to charge up. The wiper goes to the input, one side goes to +5, and that's it. I just got some 40-pin 18F4550's ($4.40 at Newark), which have all kinds of analog and digital inputs, and a built-in USB interface.Īs to the pot connections, strange as it may seem, the pots are not connected to ground. Perhaps I will build my own 'Pokey', using a PIC microcontroller. I may wind up spending much more than that trying to figure this problem out, but it will be a learning experience. However, the idea of having to buy an $80 device in order to do one simple thing does not appeal to me. I looked at the Pokey device, and it looks very nice. Feedrate override vs programming a faster feedrate?.I've played around with the USB adapter and pot on other computers, and it doesn't seem to be any better. Does anybody know anything about this? Incidentally, in case it makes any difference, I'm using an Thinkpad 770e, with ACPI turned off. Higher values give more effect on FRO, and lower ones less. The effect on FRO only seems to be dependent on the potentiometer maximum resistance. XP will calibrate the potentiometer, but the problem is that Mach3 doesn't seem to pay any attention to the calibration. I've been playing around with a USB gameport adapter, keygrabber, and a potentiometer. I used that as a safety device with the Boss controller, and I hate to give it up. I got my Bridgeport Boss Hillbilly BOB retrofit going with Mach3, but before I start cutting metal, I would like to have a knob-controlled feedrate override.
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