some first impressions

[Jameson "Chema" Quinn]

I've archived this discussion on robotics/LED output, with some points of my
own, on the wiki at http://wiki.laptop.org/go/Electrical_output.

Jameson Quinn

On 8/11/07, Mitch Bradley <wmb at laptop.org> wrote:
>
> Hal Murray wrote:
> >>  - some parallel port (or similar) should be made available, for
> >> children to play with in physics. I remember playing with a PC
> >> parallel port with some simple software to turn leds on and off. When
> >> you are a kid, being able to send commands to projects you create is
> >> great (think about modern legos, but using simpler stuff like leds,
> >> motors, etc) : it translate the "virtual part" ie the software you
> >> create on the computer to the "real world" where you make leds blinks
> >> in sequence, or a motor move.
> >>
> > ...
> > There are USB connectors.
> >
> > ...
> > USB to printer port adapters are also available.  I've never played with
> one.
> >  Prices are under $40.
> >
> >
> > There are also things like this with 24 GPIO lines.
> >   USBIO24R
> >   http://www.elexol.com/
> >   US distributor: http://www.orteches.com/  $75
> > ...
> >
> > There is also the microphone input and audio output for A/D and D/A.  I
> think
> > the XO hardware supports a DC coupled mode.
> >
> > We should work on a collection of hacks to demonstrate how they work and
> a
> > list of which ones are known to work.
> >
>
> OLCP just had a summer intern, Arjun Sarwal, who developed some low-cost
> gadgets to plug into the mic port - temperature sensor, intrusion
> detector, etc.  He plans to document them and set up a framework for
> documenting other similar hacks.
>
> We also talked about an OLPC digital gadget prototyping dongle with a
> USB-equipped microcontroller like those available from, for example,
> Atmel.  Those chips cost a dollar or two and Arjun can get all the other
> parts really inexpensively in India where he lives.
>
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