16F877 universal PCB with I/O module

[cupajoe]

Art,

The resistor network on A5 can be used to monitor the input voltage.

Sorry for the small error. You are correct the schematic has D5 mislabeled.

As for why I used two pins of port C to conrol the SEEPROM...well those are the SSP I2C pins for clock and data.

I had good reason for using most of the pins the way I did. I left A4 unused but I wanted to set it up as another output but just never got around to it. A4 has an NPN open collector output. Very handy.


Please post any questions. I can't promise I will answer in a timely manner but I will eventually check back here.

Regards,

Joe.

edit: I almost forgot. Analog ports are very powerful/useful. I use them alot.