direct pic16f84 communication with com1 w/o using any IC.

[mabauti]

does someone have a subroutine?

thanks in advance.

 

[budhy]

Re: direct pic16f84 communication with com1 w/o using any IC

direct pic16f84 communication with com1 w/o using any IC.

What do you mean with com1? Is it com1 of PC? If so, it can't be done, as the PC's COM1 is running on RS232 voltage level (<-5 Volt as logical "1" and >+5 Volt as logical "0"), it will burn your PIC out!

 

[mabauti]

Re: direct pic16f84 communication with com1 w/o using any IC

I found this with google, however I didn't find the code =\
<img>http://obrazki.elektroda.pl/0_1167796149.gif</img>

 

[Cortex]

Re: direct pic16f84 communication with com1 w/o using any IC

you can use transistors instead of the max232!
regards

 

[alzomor]

Re: direct pic16f84 communication with com1 w/o using any IC

Hi

You can build your level shifter circuit instead of using max323.
but in order to do so you must have a reach power supply with + 12 and -12 and 5 volt . I think the +- 12 can vary .
The other solution is to use single 5 volt supply and make oltage dubler circuit .
which is not easy

Salam
Hossam Alzomor

 

[Siniša]

Re: direct pic16f84 communication with com1 w/o using any IC

http://www.piclist.com/techref/microchip/rs232.htm

 

[mabauti]

Re:

Well, I had to use a MAX232 after all (though the idea about 2 T's is not bad at all)

thank you anyway guys