Hello Picnaut,,

Picnaut >>If I understand you correctly, each switch brings the point where it's connected to ground. That means that there is no voltage drop across the rest of the resistors between that point and ground, even if the switches at those resistors are pressed.

The only problem with this method is that it can't handle simultaneous switch presses.<<

Yes, you are correct It cannot handle two switches at teh same time.

Picnaut >>
I will probably use it on my next project that uses a rotary switch.
It would be good for multiposition slide and toggle switches too.
There is no way that you can hit more than one switch at a time with those.
<<

I Understand... I enjoyed the accuracy of the PIC AD converter... It was always within +/- 1.... thus, if the number should have been 202,,, it was either 201 or 203...and mostly 202... And it was like this right on up each of the resistors. Granted we used 1 percent tolerance resistors, but At least we can read a value and see if the tolerance is within 5% and know what was pressed....with confidence.

We are looking (right now) for cheap keypads. maybe in a matrix situation.

Dwayne