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Originally Posted by Venkatesh
We have been experimenting with line tracking and the 2004 controller since week 2. Here is how we have wired it up. The desired signal wire (white/black) from the banner sensors are plugged into the RC's digital inputs, the signal port. The ground wire from the sensors (blue, if I remember correctly) are connected to the ground port on the controller. The power line to the sensor cannot be plugged directly into the controller. The sensor requires +12V to operate. We powered it off the main breaker block, through a 20A circuit breaker.
As a side note, the white and black cables carry signals which are just NOTs of each other, so either one can be connected to the signal line of the RC. Also, the light sensors may power up from the +5V line of the RC, but they will not function reliably.
Good luck with line tracking! It is serving us well over here.
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do the both have to be plugged in to work properly??? just want to double check before i come across unknown errors