The concept was planned, sketched and presented for feedback and to confirm the initial manufacturing process. Components for this project were modelled in Fusion 360 (3D prints) and Illustrator (laser cutting). A particular focus of the design process was to simplify the manufacturing process so that multiple animals could all be produced easily with only 1 component, that being the animal shape, being changed.

Rapid prototyping occurred with electrical components and carboard to inform the overall size and chassis arrangement. A series of 3D printed components were produced (servo housings and base plates) which allowed for easy adjustment to component placement. This process greatly improved the overall chassis arrangement by changing the mounting position of the battery pack. A minor component of the build that underwent extensive prototyping was the wheel design and diameter. 3D printed wheels did not provide enough grip, so O-rings were used to give the wheels traction.

Test laser cuts of the animal bodies were produced to ensure they could be easily mounted to the chassis. The final design relied on offset screws to facilitate attaching both sides.

The Microbit coding also underwent extensive prototyping and 13 versions of the Microbit code were produced, loaded and tested before resolving the final code. The sensitivity of the ultrasonic sensor was the most troublesome.

During user testing most trials were undertaken in large unobstructed areas. However, when placed on the initial canvas area of 2 xA3 sheets square it was apparent this wasn’t enough for the interactives to move freely. A larger canvas area resolved this and when Ferdinand was finally run it elicited squeals of delight.