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BUILDING A PIC16F87X COMMUNICATION BOARD:

Interfaces needed (wanted):

1. RS-232 (to PC, GSM-module, modem etc) or RS-485 (small network)
2. Keyboard
3. IR RX
4. IR TX
5. LCD display



Some help with the questions or comments from other projects?


Q 1: IR TX

When build a IR TX board with a PIC with PWM output, is it possible to =
set
the PWM to 38kHz (or 40 kHz for Sony), and turn the output pin ON and =
OFF
easy by program?
Or do I have to use this diagram (IR2.gif with NAND gate) to switch the =
IR
LED ON and OFF. It use to pins but I want to use only one to IR TX.

See IR2.gif


Q 2: IR RX

Put it on a pin with interrupt on change pin (RB4)?


Q 3: Keyboard

Is it a good idea to put the clock on INT pin (RB0) and data on any =
other
pin (RA0 or....)?


Q 4: RS232

If I need some control/status lines from modem RI (ring indicator), =
CTS,
RTS, etc., any tip to fix that?


Best regards

Ole Andreas Gl=F8ersen
LA9SHA




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