[PD] pduino/comport w/ arduino freezes keyboard and trackpad on Macbook
David NG McCallum
d at mentalfloss.ca
Wed Oct 18 17:14:11 CEST 2006
I think I made the mistake of mentioning several setups in the same e-mail.
What I should say is that when *nothing* is plugged into the arduino,
I still get the lockup.
Curiously enough, it freezes when I select the "cu.usbserial-XXX"
devicename (the one that the arduino software itself uses), but not
when I select "tty.usbserial-XXX".
I assume this has something to do with the problem...
Thanks for the suggestions!
On 18/10/06, Hans-Christoph Steiner <hans at eds.org> wrote:
> The arduino draws very little power, probably less than 100mA, any
> USB bus should power it fine. A short circuit will shutdown any USB
> bus. It could shutdown a poorly implemented USB bus forever.
> The problem you describe sounds a lot like an intermittent short
> circuit to me. It could also be the motor drawing too much current
> under certain conditions. If running a motor, I'd run an external
> power supply.
> On Oct 16, 2006, at 10:59 PM, David NG McCallum wrote:
> > Drawing too much power might have had something to do with a motor I
> > was running. But I had no problem with the motor using my own arduino
> > code.
> > The situation with mis-wiring the pot was independent of the comport
> > object freezing my kbd and mouse, though. The kbd and mouse froze when
> > everything was wired up fine (which worked w/ my own arduino code,
> > just not with comport).
> > It's now mysteriously worked, the last time I tried it, but the wiring
> > was all the same as before. So I have no idea, now that it's not
> > really reproducible...
> > D
> > On 16/10/06, nick weldin <nick at padarts.idps.co.uk> wrote:
> >> If drawing to much power from the usb socket is the problem then you
> >> need to provide power for the arduino either by going through a
> >> powered hub, or if you are drawing to much power on the arduino to
> >> run it off usb switch the power jumper over on the board and provide
> >> power for the electronics on it seperately, rather than drawing it
> >> from the usb bus.
> >> HTH
> >> Nick
> >> >Hi HC,
> >> >
> >> >I've had the problem of the USB bus being killed because to much
> >> power
> >> >was drawn, but it was because I plugged a pot into the wrong ports.
> >> ...snip...
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