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line follower circuit

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They're NPN transistors and I'd assume that their emitter is connected to the negative terminal of your battery. It's not on the schematic, but it's probably assumed to be a given.


Edit: nevermind, it IS on the schematic
 
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Also, you don't need the resistor and two red LEDs, but if you do use them, make sure you pick a resistor to match your LED pair
 
Ahh, the one end of the photoresistors is likely meant to be hooked up to the positive terminal of the battery?
 
I've seen that sandwich robot design before, I even have the book. I find that it is better if you use an op-amp with a gain of 2 for the circuit because it is less likely to stop its motor suddenly and pass right over the line.
 
This is my circuit that i designed myself: (xps file)
Code:
http://www.mediafire.com/?0h6tsht4tlo2nzq
Sorry for i cant capture into MS Paint since it is too big with screen!
If you can not read it, i can re-post part to part!
 
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