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How do we determine what the pullup should be? I mean 100 to 300 ohms or 10 K ohms doesn't exactly give me the data I need. (Does it vary with the circuit being driven for example?) I really want...

I have noted this discussion on Pull Up resistors. I am running the PIC18F series chip and it in the documentation says it supports a weak pull up setting internally in the chip. Could I get any...

I have really only wanted a basic description of the process solution. I am not asking for code so much as use timerO to count ... and timer1 to count. This is sort of a process thing rather than...

I have first to thank everyone for responding quickly.
The problem with my RPM calculation is that it needs to be fairly precise and in fairly close to real time. The preferred device I have to...

It is fairly simple to produce a disk which provides a pulse which is say 5 degrees wide of a rotation. This pulse can be measured relative to the width of the pulse in time. The resulting time...

I know the Pull up Resistor attaches to Vss but where does it go else wise? Also... What happens to other test programs etc by its presence?

Paul

You confirmed my research and it is always nice to have someone back up your thinking. It either means that the both of you are lost ... (not in this case) or that you actually understand what the...

First Thanks!

Next I will try your solution and report the results and report if there are any problems.

Finally: Please tell me why this should work. In trying to read all the fun stuff...

here are a few tricks you may wish to try.
(1) MOSFETS love to be in parallel. This allows you to get the heat down a lot.
(2) Overdriving the control a bit on MOSFETS (50% or less) is generally...

I am taking the standard program to demo the PIC16F877A as a clock and starting to branch out leaning as I go. Sorry if I am just leaning but I could really use some help The problem obviously is...