as the light sensors that came with my first and second rcx where not useable when you want a laser guided robot, i diceded to make my own light sensors
and here it is my first instructable :)
excuse me for my bad english i'm not good at spelling and i'm dutch so... please if there is something incorrectly spelled let me know then i can fix it or pay more attention to it

Step 1: get the stuff

ok first of all i used a way to light LDR (light dependent risitor) it did not have enough resitance so my light sensor is a bit sensitive..

but what you will need is a LDR that has about 3500 ohm's when you expose it to a simple laser pen
mine didn't have that much resitance so i fitted a aditional risistor of 1500 ohms.
but that is all up to you

ok what you need:
an LDR
A conductive lego strip
A lego brik
maybe an aditional risistor
haha, u english is good enought for me to understand. i'm chinese.
Did you know that instructables has a built in spell check? Go to the editor and click on it for every step. Here's what I got: diceded -decided risitor -resistor brik -brick assemblage -assembly gleu -glue Over all, not bad for a non native speaker Great job on the instructable, this looks like it could be very useful
i did not know about that built in spell check.. dut thanks i will check it out on my next instructable ;) and i have a way to small keyboard so sometime's it gets messed up and i don't always notice xD
Don't get me wrong, this is really good for a non-native speaker. Some native speakers do much worse
Haha,random fact: I'm not a native speaker and I never used spell check.
Thanks, this was very helpful to me

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