Our program never successfully followed the line due to the fact it reacts late to turn and by the time it does turn it has already drifted off the track.
But during the test day it did not show any signs of activity. this was because the range of change the sensor would show from when its on the white surface and the black line was not going over 8. and the program would only react if the change was over 10 on one wheel and 15 for the other (because the LDR ranges were different)
reasons for this drop of range is because there was either too much or too little light. as Dr gareth suggested we could have adapted a third sensing mechanism that will detect how much light is in the room and change that range respectively.
Even if the light intensity was exactly how we wanted the buggy would still haven't followed the line in my opinion. But at least it would show more activity.
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The differential approach can work but as set-up you would be vulnerable to local light changes as the sun went in and out or even due to the shadow cast by the buggy itself changing depending on whether it was driving forward or backwards or with the ambient light on its left or right.
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