IR-RS232 with pic 16F628A

[jj 2]

I too am new to this forum. There are a lot of questions to be clarified.

I assume the IR device output is TTL, 0-5 volts, 0 with no IR input and 5V with IR input. If so, why the Max232? Is the purpose of the Max 232 to provide output to go to a PC?

I assume the device will output a sequence of ON/OFF TTL transitions similar to an RS-232 character - correct? Does the IR device output a RS-232 code? If not, then you need to decode the output some way. Assuming it is "RS-232 like" you will need to determine the bit timing and program the pic to detect the bit sequence.

What is the data bit rate? I took a class once and we did some 1200 baud pic to PC RS-232 experiments using a 4MHz frequency for the pic. If the baud rate is faster you may need to go to a higher pic oscillator frequency.

Google the Microchip web site and check out some of the application notes and sample code to get help on programming the pic to handle RS-232. Decoding another format code can be handled similarly.

Hope this helps.

jj 2

[aloncha]

Thanks for your help!
The purpose of the MAX232 is to provide output to go to a pc and input from the pc.
I want to send some string by RS-232 and output a IR signal, so I want to use the PIC as a translator.
I want to save in PIC the IR code of the equipment and make correspond some string to an IR code, example: typing "PL" on the hyperterminal I want the pic to send de PLAY IR code, previously known.
I´m planning to use the 4MHz oscilator, so what is the maximum speed allowed for that crystal?
If you have some code examples you will help me a lot!!
Thanks