Buggy Build Update

A couple of improvements have been made to the buggy in order to improve the performance of the line following.

We experienced problems with the LDR's not reading light the way we would have liked it to. Because the LDR's read all visible light, the sensitivity repeatedly changed in different ambient lighting conditions. At one time during testing the LDR's readings changed by 40 from around 100 to 60 when taking the buggy into different rooms. To solve this problem we incorperated the use of a shield which blocked ambient light from reching the LDR's. This shield was made from black card and was assembled around the two sensors. The black card reduces the reflection of the light from the LED's. This means that only light from the LED's is reflected from the white surface to the LDR's, therefore improving the line following performance of the buggy.