Structure

I have created some CAD models of the different components of the buggy so that I could model the shape and size of the body needed for the buggy while out of class and during class when the components were in use.
The models include:
Breadboard, darlington driver, Pic board, battery pack, large wheel, small wheel, motors.
Components I made were:
Trolley bracket and the box structure.
As discussed with Adam the structure is to be made with strong cardboard which has been sourced and is rigid 240gsm weight. If the card bends then wooden dowel can be used to strengthen it. The buggy dimensions are shown below this allows the fit of all the components and I have allowed enough room for the wires to fit.

Also shown is the bracket which will be easy to make out of a bendable metal such as a clothes hanger wire to create a turning pivot for the front ‘trolley’ wheel to allow free but stable movement.

The LDR’s are located under the buggy and close to the ides so light may enter easy and the definition between white paper and electrical tape easy to differentiate between.