xbee and max232

[lockman_akim]

i want to send data from pc to pic using Xbee..

so, i if im using wired connection, i need to use max232 ..am i still need that chip if im using xbee?

[ober]

i want to send data from pc to pic using Xbee..

so, if im using wired connection, i need to use max232 ..am i still need that chip if im using xbee?

Not really understand the question, help me.

You are going to send data using XBee and now become wired connection, the wired connection mean from PC to PIC? Or the XBee?

[lockman_akim]

i know how to communicate between pc and pic using serial com..
but before this i was never use Xbee coz im just use serial com cable and it need me to use
max232 ic at pic board..

my question is.

am i still need max232 at pic board if im using xbee?

[ober]

OK, got it now.

No MAX232 is needed because XBee is not using RS232 voltage level. Instead you will need to take care the 3.3V voltage level of XBee. XBee is operating and interface in 3.3V while most of PIC operate in 5V. So becareful.....

[yonghui]

hi lockman_akim,


Max232 is just a voltage level shifter.
com port of 12V to 5V for PIC.
for Xbee at PC part. if u r using SKXbee from cytron, then it has the USB to serial ic already. else if u r using the com port, its 12V, xbee accept 3.3V level. be careful .

for PIC part if ur PIC is 5V, xbee is 3.3V, need to be careful also.


regards,
yh

[lockman_akim]

i have the usb - serial converter..
i want to connect it to the xbee..
but as you all said before, com port is 12V..
how can i drop the voltage without lose the data signal..

can i use voltage divider?
or switching transistor?

[robosang]

well, RS232 is not only 12V, but is actually +12V and -12V.

To save the pain, suggest to use MAX3223 if I am not mistaken. It can support 3.3V to true RS232 level. But it is in surface mount package

[ober]

Yes, is either using a ready make chip to carter the 3.3V to RS232 level or you get your self a USB to UART, then you can use voltage divider for 5V to 3.3V and 3.3V to 5V should be fine to connect it directly.

[sarra]

Hey,can u teach me how to transfer data from max 232,rs 232 to my computer..
im really blur..help me please..
actually im doing sensor circuit as detection button..
then from ir sensor circuit im do some programming at PIC18F452 to LIGHT the led
then i want to transfer data signal to my pc using cable rs232
im making VB as my GUI
can someone help me..
Really need your help

[shiyan]

same question in another thread?