The CAD drawings of my Robot.

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Here i have  a bottom cad drawing of my robot using the shadowing comand on cad.

Different views from Cad.

On my robot underneath i had mini speakers and a battery pack for the motor , the gearbox was a Tammia brand with the ratio 203:1, with twin 3 volt dc motors to control left and right turns, these were controlled via a IC motor controller on the  28 x-1 picaxe. The wheels were also Tammia brand with an OD of 56 mm.
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Pictures of the ultra sonic sensors and the 28-x1 picaxe.

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I used x3 ultrasonic sensors for sensing with the 28-x1 picaxe and i also used a seperate 4.5v battery pack for picaxe so their was no voltage drop for the picaxe.