Re: Stepped lighting.

On Mar 30, 11:45 pm, martin griffith <mart_in_medina@xxxxxxxx> wrote:
On Fri, 30 Mar 2007 21:30:20 GMT, in sci.electronics.design "John





Barrett" <ke5c...@xxxxxxxxxxx> wrote:

"I.P.off10" <La casa d'ayer ria> wrote in message
news:IZSdnb47VcO17JDbnZ2dnUVZ8qugnZ2d@xxxxxxxxxxxxxxx
a request for a circuit/layout for light switching that will turn on

low level lights 2 or 3 steps in front & 1 behind as a person walks

along a corridor or up/down stairs. Component list & values would also

be required if possible. My thanks for your consideration.

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Option 1.. low power laser range finder at one end of the area to be
covered, with microcontroller to read the range and control the lights (low
level ?? perhaps LED ??) .. this setup would be able to determine direction
of travel and do the 1 behind and 2 in front requested.. practically
speaking, this setup would be limited to 4-6 lights due to cabling
considerations

Option 2.. ultrasonic or laser sensor at each light -- with wiring between
the lights to allow one light's trigger circuit to also enable the adjacent
lights -- this could be done without a microcontroller by activating 2 in
front and 2 behind, or with a microcontroller at each light.. this system
can be modular... extensible to any length of light string with no more than
4-8 wires between each module -- CAT5 cable and connectors would be optimal.

if you are talking more of a strip light than a series of wide angle point
sources... the same techiques can be applied with the lights in banks, or
with more extensive microcontroller control to actually turn on individual
closely spaced sources in sequence.

You are welcome to contact me via email if any of these options address your
problem.

hmm, force sensing resistor, 5 or so diodes, couple of logic gates,
and of course a 555, just to annoy Bill Sloman

I'm more anoyed that you didn't notice that this is actually a job for
an off-the-shelf person sensing circuit, that you can buy in any
lighting shop.

IIRR the fittings contain an infra-red sensor which picks up human
body warmth - spread a couple of them along the corridor and the job
is done. No need for logic or a 555.

--
Bill Sloman, Nijmegen

.

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