i want to make my robot switch on its lights when he encounters a dark room. i know how to do this (components i need, how to wire em up .....) but this is not i want to ask you. My concern with it is the following:
if i make such a circuit and attach it to an output pin on my picaxe, i'll have to keep that pin "high" for the whole time the robot goes around.
is that gonna drain out my batteries quickly?
if the led is not switched on (no current flowing in it) is it still gonna drain my batteries?