Dave Turner wrote :

> To run 6 to 12 LEDS, you will need 6 to 12 IO pins.  Also, you will
> probably want a few more inputs and outputs for buttons, or jumpers. 
> Most of the PICs with more than 18 pins should cover this.

As it was specifed, 18 would do.

> As for using jumpers for configuration, You would need some sort of
> system to connect the pin to either ground or 5V, depending on the
> jumper status.  I'm not sure if the pin reads high or low when just
> disconnected.

Internal pullup and jumpers to gnd.

With some clever technices you can get three "levels"
on each pin (high/low/open), or more using external
resistor networks.

> I think nearly all of the PICs should cover all these requirements,
> except the tiny 8 pin devices, and probably not the 18 pins (unless
> you use strobing).

Again, there wasn't enough in the "specs" to exclude 18-pins.

Jan-Erik.



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