One was far too long and the other I initially thought was too wide, but, after double checking the rules, I realised that the accepted width is actually slightly larger than an A4 sheet and my choice was made!
The initial list of requirements I came up with are as follows
- Built around a Raspberry Pi 3A+.
- This provides the built-in WiFi/Bluetooth and CPU power of the 3B, but in a smaller package that will help maximise the available space inside Wall-E.
- Quite a few of the existing Wall-E conversions found online make large, visible changes to the body. Such as cutting away the motor housings to install servos. Ideally I'd like an end result where you have to look closely to spot the modifications
- Install a laser ToF sensor
- Several challenges require detecting how far away from a wall a robot is. A laser sensor will provide this ability in the smallest package.
- Install a Raspberry Pi camera
- A number of the autonomous challenges require some level of visual processing. So the installation of a camera is a must. Ideally this will be in Wall-E's head, but failing that on the front of the body.
- Install an LCD/OLED to replace the battery usage
- Having a UI on the robot is often useful for launching challenge specific scripts and check on his status, without having to carry around a laptop. To keep this in theme I'd want to replace the battery level screen for this.