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This is a link post Arduino for Lego Trains: Light Sensors I made this!
How to stop your Lego trains at stations using a light sensor. WARNING: this video contains cranberry jam.
(I helped save b3ta! Grrrmachine the indifference engine, Sun 15 Mar 2015, 9:34, , Reply)
This is a normal post No snuff thank you.

(I helped save b3ta! VicJameson : fucking internet virgins since, Sun 15 Mar 2015, 10:46, , Reply)
This is a normal post what a fucking palaver
i was thinking of using arduino in one of my projects but this has put me right off.
 (I helped save b3ta! amoebaboy chose for death by unga bunga on, Sun 15 Mar 2015, 11:15, , Reply)
This is a normal post His voice put me off.
I imagine this is how Viz's Mr Logic speaks.
 (I helped save b3ta! Tab Hunter Make this useless process end and so, begin again, Sun 15 Mar 2015, 13:03, , Reply)
This is a normal post Isn't it pronounced ard-wee-no
rather than ard-you-wee-no?
 (I helped save b3ta! HoratioFellatio Taking the the out of psychotherapist, Sun 15 Mar 2015, 11:17, , Reply)
This is a normal post Yes

(I helped save b3ta! notoolsovernight you're all luvvly an' 'orrible, Sun 15 Mar 2015, 19:39, , Reply)
This is a normal post I really enjoyed that

(Spin Its a thing., Sun 15 Mar 2015, 12:05, , Reply)
This is a normal post A b3ta production!
This is how they should teach at the university level.
 (I helped save b3ta! cowcat Bituminous squeegee, Sun 15 Mar 2015, 15:54, , Reply)
This is a normal post I liked the jam
and the fast cut editing in the early part of the film.
Then he started talking about teh codez or somesuch, and it all got very boring.
Anyroadup: wasn't it the year of teh codez LAST year?
 (GforGermany looks like some sort of retaining plunger, Sun 15 Mar 2015, 21:35, , Reply)
This is a normal post The trains use magnetic couplings.
So a reed switch is a far more reliable sensor, and doesn't require dicking around to physically adjust or compensate in code for varying local light levels.
 (I helped save b3ta! joefish It's hard for thee to kick against the pricks, Mon 16 Mar 2015, 13:05, , Reply)
This is a normal post
Reed switches are triggered per magnet, and since there's one at each end a single train like the one shown will be detected 5 times in one passing. Yes, you can adjust the code to match but then you have to readjust the code if you ever change train length, which is tedious.

The basic light sensor, with one twiddle of the screw, is dimmed one time for the entire train no matter how many wagons you have. Job done.
 (I helped save b3ta! Grrrmachine the indifference engine, Tue 17 Mar 2015, 6:30, , Reply)