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I have a Nano clone here, that sporadically fails to get detected by my banana pi. This is annoying, because it works for days and hours, but fails to work randomly.

The Nano gets it's own power via VIN and thus should have enough power.

I thought of bypassing the FTDI and make a Serial connection via 2 Wires. Alternatively: Is there a way to force the arduino to use external Power over USB. I have the feeling, the the arduino wrongly decides, that USB is the better power source and uses it, causing the errors ( device not accepting address 21, error -62 )

P.S.: There is also a touch-screen connected to the banana pi via USB. Whatever port I use, It works and never failed. Just the Nano fails from time to time.

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  • Many arduino type boards have a resistor between the USB-serial function and the main ATmega, potentially allowing an external "strong" driver to take over. But the Banana pi may not (?) support 5v I/O. Your best bet is probably to locate and remove that resistor, then build a level shifter with resistors. For safety you could put one on both transmit and receive, since the the receive pin could potentially be misprogrammed as a 5v output. As for the USB, is your "arduino" and especially its USB-serial chip real, or fake? – Chris Stratton Apr 14 '16 at 14:37
  • One could lower the 5V line from arduino to the banan pi with 2 resistors (voltage divider)/. That would be it. – ansi_lumen Apr 14 '16 at 14:38
  • Minimal recommended voltage for Vin is 7 Volt! – Gerben Apr 14 '16 at 15:27
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    @ansi_lumen It's probably easier to just remove the 5v wire from the USB entirely, or remove the diode D1 from the board (the black two pin component on the bottom) – Gerben Apr 14 '16 at 15:33
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    I can't comment so have to post this as an answer, but perhaps connect the GNDs together? But I also see that someone else mentioned the whole el-cheapo concept, too. I have noticed differences between boards sometimes, and exchanging them with one from a known supplier sometimes fixes my problems. – SDsolar Oct 28 '16 at 8:19
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To answer this question

The arduino in question was broken. Shortly after asking I was not even able to connect it to my PC successfully. I replaced it with a new one and everything runs smoothly now for months.

Since this unit survived a whole product development-process I am not surprised at all. In fact I had three and expected one to get killed in action.

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