Arduino causes hang when booting

[Doug Norton]

MacOS 10.9.5 and it’s a real Arduino uno and a newer one. I’ve thought about moving to a network connection, this reboot thing is starting to be a pain.

Doug


> On Mar 21, 2016, at 10:56 AM, James Sentman <james at sentman.com> wrote:
> 
> What OS version are you using? Is this a recent Uno with the “new” driverless USB/Serial chip? An older Uno with the (preferred by me as it works better from my experience) FTDI chip, or a chinese clone with an unsupported “CH340G” serial adaptor?
> 
> Some of those new driverless things can look like a keyboard at launch and do all sorts of other USB things too and so are more complicated, where the FTDI based ones don’t even have drivers anymore for the last 2 OSX versions there are apple signed versions. The newer ones use another atmel chip with some firmware to pretend to be a standard’ish serial device that the OS should handle properly, but it’s all software emulation and I have no idea if they have a way to update that in the chip or what. The fact that it can pretend to be a keyboard or other devices too might be the problem for all I know the computer is waiting for a keyboard plugged in to initialize itself or something. There are a lot of threads out there with people having difficulty getting these to work, but I couldn’t find anything about keeping the computer from booting newer than about OSX 10.3 or so.
> 
> If it’s the Chinese knockoff then there are properly signed drivers you can download which should let the drivers load, and perhaps it’s the fact that the kernel is refusing to load them that is causing the problem, I don’t know…
> 
> As a last ditch solution you could always use instead one of the USB/FTDI cables that I linked to in the arduino pro/mini thread, you’ll need a 5v version for the Uno and not the 3.3v version. Connect the power and 2 serial lines and you can bypass the built in chip entirely with one that you know will work. That would be frustrating though because it will add $15 to the cost which is probably as much as the arduino cost in the first place… 
> 
> 
>> On Mar 21, 2016, at 8:04 AM, Doug Norton <norton.doug at gmail.com <mailto:norton.doug at gmail.com>> wrote:
>> 
>> I’m hoping someone might know why my MacMini won’t boot with an Arduino Uno plugged into the USB. The mac will hang very early in the boot process. It’s almost like the Mac considers it a boot device but my Startup Disk is set correctly. Unplugging the Arduino the Mac boots as it should.
> 
> Thanks,
>  James
> 
> 
> James Sentman                       http://www.PlanetaryGear.org <http://www.planetarygear.org/>		http://MacHomeAutomation.com <http://machomeautomation.com/>
> 
> 
> 
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