I basically want to turn on an LED when a voltage goes from 1.80 to 1.86. B=
eing able to shift the range would be nice to. I just want to know the easi=
est way possible. I'm really new to all this...

What i'm doing is this: my fraternity is building a 5 story beer bong contr=
olled by a solenoid valve. I want to build maybe twenty cheap, simple littl=
e devices that I attatch to points in the clear tube. When beer goes past t=
hat point I want an LED to light up. I took=20a high output red LED and aimed =
it into one end of the tube. On the other end i places a photoresistor. Whe=
n the beer goes through the voltage goes up from about 1.80 to 1.86 I was s=
urprised the voltage went up - i was planning on it going down...by a lot. =
But i'm using cheap frat beer (Old German, Boh Ice) and it's the color of p=
iss...totally translucent. I guess it acts as a magnifying glass. I have a =
feeling i'm going to be in trouble if we switch brands from what i build th=
is for, but...cheap and simple is very important. Maybe=20a pot somewhere or o=
ther? Guess we'll stay away from the lagers. Another idea i had was to take=
 that magnet coil wire from radio shack, wind it around the tube tightly. W=
hen the beer passed through i figured it would disrupt the EMF...but this c=
ould just be me dreaming. Anyway, any help is greatly appreciated. Thanks g=
uys!!!!

~Rob

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