12 Jun
2009
12 Jun
'09
6:04 p.m.
Bill Sudbrink wrote:
+12V on one end, -12V on the other and the center tap
goes
back to the A to D card. The test procedure specifies +2V
and -2V at the full deflection of the stick.
Wired like that, the exact value of the potentiometers doesn't matter.
If it's easier to find joysticks with 10K potentiometers, they should
work. Too low a resistance will draw too much current (possibly
exceeding current or power ratings of the potentiometer), and too high a
resistance (relative to input impedance of the ADC) things won't work
properly, though no damage will result.
Eric