[57north-discuss] Microcontroller for simulating a USB HID

[Calum Chisholm]

Hmm... too few I/O pins if I have to do that - the nano only has 14 pins,
and I need 13 for inputs. I suppose I could add a shift-register, but it's
all getting a bit hacky by that point.

It's beginning to look like the ATmega32U4 is my best bet.

Cheers,
Calum



On 24 July 2014 19:37, Edward Watson <mail at edwardwatson.co.uk> wrote:

> On 24 July 2014 17:46, Calum Chisholm <calum.chisholm at gmail.com> wrote:
>
>> I did look at the nano, but it apparently uses a special-purpose FTDI
>> chip for USB [1], so can't act as a HID. Not sure if that's true for the v3
>> as well though - I haven't found a definitive answer online yet.
>>
> Ah sure - you would only be using the Nano's FTDI USB chip for uploading
> the code. The V-USB device itself would use your assigned I/O pins together
> with a specific arrangement of diodes to mimic the USB tx/rx pins, with the
> USB hosts V+ and GND pins powering the Nano's power rails.  Pretty sure it
> would work fine.
>
> Cheers,
> Ed
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.57north.co/pipermail/57north-discuss/attachments/20140725/ff998a52/attachment.html>