On Tuesday 30 March 2010 10:27:33 am Melchior FRANZ wrote: > Don't know how obvious this is to bu0836 users: if you don't need all > analog inputs, but could use some more digital ones, then you could > think about abusing an axis for switches: > > v analog in > 100k / 0 | > > |--------######---------/ ----------| > | 200k / 1 | > |--------######---------/ ----------| pull down as necessary > > +----| 400k / 2 |-------#######--------| > > |--------######---------/ ----------| > | 800k / 3 | > |--------######---------/ ----------| > > Of course, you should use resistors with low tolerance and high > temperature stability (MO), and you have to decode the resulting value > in the driver. Easy to do in fgfs. If the value corresponds to 1M, then > you know that switches 1 and 3 are closed. Of course, there's a limit > for how many bits you can reliably pack into an "analog value. > > There are also rotary encoders with binary output, which can be used > in the same way. > > m. > > > > Disclaimer: I've never tried this. :-
Most users trying to use these to implement a full set of controls are likely to need more than one unit to have enough analog axis to do the job. So I don't think switch counts will be the issue. A quick list of needed axis: rudder elevator aileron rudder trim aileron trim elevator trim left brake right brake throttle mixture prop RPM This is 11 axis so two controllers would be required for a fairly simple GA aircraft or a WWII fighter. Even a single engine GA aircraft with a fixed pitch prop needs 10 axis. This leaves 64 switches which should take most cockpits at least for simpler aircraft a long ways. Of course a multi engine cockpit would need even more axis. Hal ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Flightgear-users mailing list Flightgear-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-users
