The new design of the base for the buggy is there to mainly increase strength and incorporate the front trolley wheel better into the design. The initial shape has remained the same with a few minor adjustments. The box for the bread board has been widened and the length of motor boxes has been increased as well to incorporate the wires.
Two dowels have been inserted into the corners of the motor boxes and run all the way along the width of the base and two more have been added along the length of the base. These greatly increase the strength of the buggy so that the wheels like on a straight axis.
The hole for the LDRs and LED has been moved to the ‘front’ of the buggy and a skirt has been attached around the elements to stop any unwanted natural light from affecting the readings. This should make the code run faster and the values recorded clearer.
Instead of having a trapeze shaped piece of card at the back of the buggy a small box has been built so that the trolley wheel is kept vertical by two layers of card instead of one.
All of these changes have made the buggy a lot stronger and all of the outcomes have been positive.
Above are picture of the finished painted shell on top of the chassis. Although the shell weighs down the product and slows down the movement speed, it makes the product asthetically pleasing and covers up the circuitry, making the product look neater.
At the start of the project and when I did my own run through over Christmas I had envisaged most groups developing chassis from scratch - my own had been thin ply. It is therefore encouraging you developed your chassis from scratch, though it does pose challenges of its own in terms of eg. alignment, ease of alteration etc.
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