Am Montag, 29. Mai 2006 11:04 schrieb Jan Kandziora:
> +5V
>
> |--+
> >
> >---10k Ohm---| e.g. BC547
> >
> |>-+
>
> 270 Ohm
>
> +----< OptoZZ +
>
> +----< OptoZZ -
>
> GND
>
Oh. Just forgot were talking of negative logic (Dummy, I am)
+5V +5V
| |
10k Ohm |
| |--+
>------+------| e.g. BC547
|>-+
|
270 Ohm
|
+----< OptoZZ +
+----< OptoZZ -
|
GND
The input may now be pulled to GND by the DS2406 etc. output. Please note the
logic is inverted. This means, switching the PIO Pin *on* means switching the
LED *off*. In addition that means, after reset, the LED is *on*.
If you want to change this, you need to put another transistor circuit or open
collector inverter (74HC05) left of the drawn circuit.
Jan
--
Vollkommener Blödsinn: Selbst wenn man den mit was Vernünftigen
mischt, kommt immer noch mindestens 50%er Blödsinn 'bei 'raus.
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