Diavolino Serial Com

[tubester]

Hello,

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,

Tubester

[Windell Oskay]

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.

[tubester]

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.

[Author]

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