Illuminated staircase

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i'd make illuminated staircase consisting of 14 steps steps light walks or down. when step detected i'd switch on small led strip few seconds.

i've considered using pir motion sensors, proximity sensors , piezo elements detect when walking or down.

today had idea detect steps measuring difference in resistance caused stepping down on this piece of aluminium installed on every step. using analogue input pins of arduino think should relatively easy task, need control approx. 14 led strips , i'm trying find ways minimize complexity , number of wires along side of stairs.

one of questions therefore: there way build small, simple , cheap "control mechanism" installed in each step? in other words, possible build small, cheap , capable of:

  • being powered 12v

  • sense resistance in piece of metal

  • switch led strip on , off (mosfest transistor?)

  • wait seconds



ideally i'd fade each strip in , out, in attempt keep things relatively simple i've more or less disregarded feature.

similar posts/projects:
http://forum.arduino.cc/index.php?topic=76094.0
http://forum.arduino.cc/index.php?topic=70019.0
http://forum.arduino.cc/index.php?topic=62893.0
http://forum.arduino.cc/index.php?topic=51188.0

the other question of course, have general advice on project?

edit:
this tutorial explains how program single 8-pin attiny chip. perhaps run 5v(to power attinys) , 12v(to power led strips) down side of staircase, use 14 attiny chips control 14 led strips? sound reasonable or silly?

i have completed project. incorporated tlc5940, used 38khz ir detector-receiver pair bottom step , pir sensor upper level. see no reason complication of having sensor on each step. used pir sensor on upper level because wanted lighting function start before started walking down steps. used ldr allow program detect darkness. disappointment 'ramp up' time on every step rather quick accommodate family member takes couple of seconds traverse staircase; lighting effect not cool it.


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