On 9/22/05, Bob Blick <bblick@sonic.net> wrote:
> > Note that trick #7 is not a complete description: no optimal resistor
> > values, no formula to derive these values, no analysis of the required
> > accuracy of the resistors (both for various matrix sizes). If it can be
> > done with 1% it would be usefull, if it requires 0.1% it might not be
> > cost-effective, if it requires better than 0.1% it is probably
> > infeasible.
>
> Not to mention switch contact resistance. Using that method for more than
> 4 switches is asking for trouble.
>
> -Bob
>

Somebody at Ford decided to use that method for the cruise control
switches in my steering wheel.

Nineteen years later, the sliding contacts in the steering column are
adding some resistance of their own.

It's unsettling to press "cancel" and feel the car accelerate.

Regards,
Mark
markrages@gmail
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