USB in python

Steve Holden steve at
Mon Jan 26 15:22:57 CET 2009

Lie Ryan wrote:
> On Fri, 23 Jan 2009 18:56:38 +1100, Astan Chee wrote:
>> Diez B. Roggisch wrote:
>>> If all you need is on-off - why can't you just use a switch?
>> Because I want to control the on-off the device using a computer and
>> write software for it (which I am confident I can do if I had references
>> to how the wrappers to said interface). Cheers
>> Astan.
> How about (a crazy idea) using the audio jack out? (DISCLAIMER: Little 
> Hardware Experience). High pitched sound (or anything in sound-ology that 
> means high voltage) means the device is on and low pitched sound off. The 
> device will need an additional transistor to separate low voltage from 
> the high voltage. I don't know how much power can be pulled from jack 
> out, but for a home brewn device it is still feasible to draw power from 
> USB and signal from jack out.
Congratulations. You just invented the modem.

Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC    

More information about the Python-list mailing list