I need some rs232 interface PC to PIC

[PauloMota]

Hi friends!

I need some simple schematics to rs232 levels conversion (PC to PIC/ PIC to PC). Can anybody help me?



Paulo.

 

[E-goe]

You can use a MAX232
You can get samples of them via Maxim-ic

w*w.maxim-ic.com

Greetz E-goe

 

[klug]

It is simple. Use MAX232 chip.

**broken link removed**

or

http://www.cs.unc.edu/~montek/teaching/spring-02/MAX232,232I.pdf

 

[PauloMota]

I forgot to say that I don't want to use the max232, because I'd just like to do some tests using a simple circuit with transistor, resistors etc. I found in the PIClist some and I'll test the Wojciech Zabolotny's solution that I found in this page:

h**p://www.piclist.com/techref/io/serial/ttl-rs232.htm

I hope that works. Does anybody know more circuits as that?



Paulo.

 

[ash]

what type of tests? may i can help on your design.

 

[eltonjohn]

Hi Paul mota
Some PC interfaces are able to detect TTL values ..
So in your PIC circuit put a couple of inverters ( transistors)

and block the -12 volt with a diode by grounding conduction


RS232 line | <- Inverter collector goes to the Pic input
- ------VVVVV----(|' )
|
--- <--- diode
A
|
----
-- <- ground
-

 

[msmax]

Hi PauloMota,

I use this circuit, which fits in a DB9 shell if built with SMD components, to interface my PIC circuits to my notebook RS-232 port.

I use RB0 of the PIC as bi-directional comms pin and use a soft UART with interrupt on this pin.

I use HYPERTERMINAL to "talk" to the PIC circuit.

 

[PauloMota]

Thanks all for the hints!

I decided to buy a max232 and I tested the communication with the HyperTerminal and it worked very well. In my project, I'll use the polaroid's sonar 6500 to make a distance sensor. I will try to use matlab to the communication with the PC.

:wink:

Paulo.

 

[SphinX]

Hi There,

Take a look to EPE Mag. OCT/2003
There is a article about "Serial interface for PICS and VB" + PCB + software included.

PM me if you want this article.

Bye

 

[PauloMota]

Hi Pharaoh!

You could upload this magazine to mcu in Home / eBookOld / Magazines / EPE directory.

:wink:

Paulo.

 

[wylee]

Here is some link to connect RS232 interface with PIC, you should find this very useful

http://www.qsl.net/oz1bxm/PIC/628uart.htm

**broken link removed**

http://www.winpicprog.co.uk/pic_tutorial_rs232_board.htm

 

[SPATAN]

You can use this circuit.

 

[totoone]

thx sphynx but where can we get the software?

 

[swapgo]

Hi
What software you want?
You can use Hyperterminal in PC to view the data transmitted.
You can Transmitt data from PC to PIc also.

Its very very simple to develop a VB application which can communicate with PIC ( Thro Rs-232).

Just go thro MSDN if you have.

Regards
Gopi