There are endless options. You need to decide if you want a quick hack, or
a product grade solution.
For the optoisolated circuit, you will also need a reverse diode parallel
to the led, else the other half wave will stress the led too much. And the
capacitive series component to limit the currrent, then some resistive
element to limit the startup current when the cap is empty, and you end up
with quite some components. You could simply use a very small transformer
instead (there are 1-2W transformers, about 2x2x2cm). And you can use
optocouplers that have antiparallel leds, so do not have to bother about
blinking. (still need some capacitor to remove the 50-60Hz)
You still have to have a device to connect to 1wire. As the op. mentioned 6
distant locations, an 8 port io board is not a solution. So you need 6 io
boards, with ds2413 or similar.
Or you stick with the hard core hacker solution: a small 230V lamp(like a
signal lamp) and a ds1820.
Vajk
On Wed, Dec 5, 2012 at 7:36 PM, Nathan Hurst <[email protected]> wrote:
> You also need a resistor (or inductor) in front of the divider to
> avoid turn on transients killing your LED.
>
> personally, I would just buy a low power switchmode led driver such
> as:
>
> http://www.suntekstore.com/goods-14002514-10_x_580-600ma_constant_current_regulated_1x3w_led_driver_.html
> and use that instead.
>
> njh
>
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