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Hi all

I have a project which needs two timing intervals set. I did the
proof-of-concept with a 16F88 but would like to use a 12F675
in the actual product

Using the 8 pins of the F88's PortB, each interval was set digitally
with its own 4-way DIP switch. ie B<3:0> and <7:4> ranged 0-F
individually. The value for each nybble is the counter for a 10ms
timer, so Interval1 can be set from 0 to 150ms, and likewise Interval2
also from 0 to 150ms

I have two A/D pins free on the 12F and can use those to measure
distinct voltages. That could be done with two 12-way rotary
switches + resistors, possibly using a 12ms timer to get the same
approximate range

My preference would be to use the 4-way DIP switches initially
and probably replace those with solder bridging pads later once
the client has a better idea of what the optimum settings are

Referring to the attached drawing, is there an algorithm to determine
the values of the resistors so that the A/D can best discriminate a
voltage which corresponds to the binary setting of the DIP ? Or has
anyone done or seen this done before ?

TIA

Joe

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