Diavolino Serial Com

Just finished my Diavolino board.
Is it possible to connect it directly to TTL level COM port on PC(XP) by using TxD, RxD and Reset through D9 connector or I have to go through TTL to USB converter?
Thanks in advance,



  • I guess I'm not familiar with a "TTL level COM" port, but if it exists, then there should be some way to hook it up.  The FTDI adapter is not strictly necessary, and there are a great many articles out there about programming an Arduino directly from an RS-232 port.   Depending on exactly what your computer has, you may need a level adapter or polarity adapter in order for everything to work correctly.
  • Thanks for your response.
    I even built a level adapter with 2 transistors, based on the Arduino S3v3 Revision 2 schematic that like Diavolino outputs directly RXd, TXd and Reset.
    I then connected Diavolino to normal RS-232c on COM1 (XP).
    It does work and I can upload sketches.
    But  I get the avrdude:stk500_disable():protocol error, expect=0x14, resp=0x00   OR 
                        avrdude:stk500_getsync():not in nsync:resp=0x00

    Any hint would help.
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