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In lugnet.robotics, Michael Gasperi writes:
> Ralf Krause <lego-robotics@crynwr.com> wrote in message
> news:B691251F.ED3%nospam.krause.ralf@web.de...
> Michael, please tell me how you can write that the power can " ... provide
> 30 mA of power to operate other sensor electronics." As I 've tested it
> seems that you can't do so ... or I am totally wrong ...??
>
> Nice work!!
I agree !
> I guess I don't know where I got the 30mA right now. Most of
> this is based on the fact that I thought there was a 120 ohms in series with
> the 8V. At light loads (where I originally measured) this it is the case.
> However when you really load the sensor output down, it looks more like the
> resistor is 220 or maybe even 330 ohms. I just played with my RCX and can
> get about 15mA at 5V with new batteries.
How depressing. :-(
> The circuit in the RCX is
> obviously not a simple resistor anyway. Sorry to have mislead you. I think
> I'll tinker around with the wording of my web pages. Too bad you need to
> use an output to power the sensor.
Of course !
But, it's possible to drive more then one of these sharps with one output. And
shouldn't it be possible (without large effort) to use the input-power to
multiplex some of the GP2D12 ?
(AKAIK this input-power is 3ms high then 0.1ms low, right michael ?)
Could your MUX be used for that, Michael ??
http://www.plazaearth.com/usr/gasperi/mux.htm
Rainer
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