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This kinda peaked my intrest SmileyWouldn't the best way to do this(without a mcu) be something like this:DC -> H-bridge -> MotorSmall DC -> Photoresistor 1 -> T1,T4 -> Motor spins!Small DC -> Photoresistor 2 -> T2,T3 -> Motor spins!H-bridge is designed like so:transistor 1, top right corner of h-bridge, 2 is top left, 3 is bottom right, 4 is bottom left. Of course the photo resistors would always be giving SOME power to the h-bridge.. as it will never completly resist the charge. This would cause the robot to kind of swirve around in uneven light, and in even light drive a semi-straight line. It would also have the effect of making it turn into shade.. The transistors would always be suppying SOME power beacuse they do not act as on/off switches in varying voltage enviroments such as this.. if it were setup to be only .5v or 8.5v(or something like that) then it would work..but chances are it would see things like 1v-12v in varying levels.
You need a schematic before you can decide on part #'s TongueThat sandwich robot tutorial lists parts . . . In the end, we can't make your robot. You will have to figure this out . . . look at the parts online and see if they fit with what you want it to do.After you make your schematic and select parts, feel free to post it and we will error check it for you.