My FLL team is running into a problem:
We're trying to make a linefollower, with 2 colour sensors.
When both see White, the robot goes straight on.
When one of them sees Black, the robot turns.
This all worked fine.
But then, well, I don't know what happened.
All of a sudden only one colour sensors works.
We checked all connections, and they work; when using View on the NXT both of them work fine (but not simultaneously, obviously)
We even replaced NXT with a spare one.
But when running the program, only one of them works (led emitting light). Sometimes the left one, sometimes the right one.
Any hints on what can be going on are much appreciated!