Posted by Yehonatan on 10, 2000 at 4:57 AM:
In Reply to: Re: 8-Way to 4-Way joystick question. posted by SpyHunter on 9, 2000 at 11:13 PM:
: : I'm fairly new to this board, but I was wondering if it would be possible to convert a standard 8-way joystick to a 4-way joystick by using some logic gates between the 4 microswitches. As I understand it, an angle position is sent when the vertical and horizontal switches are depressed. So, to eliminate the angle signal, just use a NAND gate between them. (This avoids special "jigs" and then need for increased #'s of joysticks on your control pannel) This seems to easy and has prolly be brought up before, so what are the drawbacks to this method. What am I missing.
: Im not sure if this would work but it does seem to me it would. However, there is a problem with your logic. The truth table for a NAND gate is as follows: 1&1=0 1&0=1 0&1=1 0&0=1 therefore, if neither switch was made you would get an output which you do not want. I am working on the correct logic and a wirring diagram and will let you know as soon as Im finished. Thanks!
: Spy
You are right, that 0&0=1 state does pose a problem :) I'll think about it too. Let me know if you come up with something. Asside from the logic, I was thinking that there will still be some "slack/dead" position on the diagonals (I'm guessing a few degrees with my Supers) This might not be ideal for a 4-way stick application. But it's probably more practical/convienent to have an "electric" solution than a "mechanical" solution.