RS232 to CMOS Voltage Converter
th3jester
Posts: 81
I need to convert RS232 to CMOS levels and vice verse. I know I can use a Max232 chip, or something similar, but I don't have to time to order any. I found this schematic and am curious if anyone has successfully used it?
I've done a few simple tests and it seems to work like it should, I just want another opinion so I don't burn out my Xbee's.
My project is interfacing the Ridgesoft Intellibrain Robot (Atmel chip, Java Programming) with LabView wirelessly. The robot com ports are -9V to +9V and the XBee's are 0V to 3.3V.
I've done a few simple tests and it seems to work like it should, I just want another opinion so I don't burn out my Xbee's.
My project is interfacing the Ridgesoft Intellibrain Robot (Atmel chip, Java Programming) with LabView wirelessly. The robot com ports are -9V to +9V and the XBee's are 0V to 3.3V.
Comments
A special consideration with the XBee is that its serial input (pin 3), already has a pullup resistor (unless you disable it with the "PR" command). So, it may not really need the 10k pullup resistor in the circuit for that pin.
So, Stamp p16 to PC will work but Stamp p16 to some other partially implemented device won't.
Thus the value of the Max232, Max233, and ST232 type of chip.
Cheers,