In June 2012, I already had some prototype of EV3 hardware, so I could start tinkering with the LEGO Education EV3 core set. One of the robots I really wanted to make with LEGO MINDSTORMS EV3 was WALL·E (Waste Allocation Load Lifter – Earth-Class), a fictional trash compactor robot left back on Earth to clean the planet from garbage, in a not-so-distant super-consumistic future. Finally, after 2 years, I decided to publish it under the (lame) name WALL-EV3. The first LEGO MINDSTORMS Wall-E robots were made with the NXT system by another MCP fellow, Marc-Andrè Bazergui. One of his robots can even transform into a box!
My WALL-EV3 has two triangular shaped treads driven by two EV3 Large Motors, and rotating head and arms driven by the EV3 Medium Motor. I designed other variants for mechanism of the head and the arms, for example to make a tea-serving robot like this. The EV3 gyro sensor allows the robot to drive perfectly straight, and turn precisely, even if the treads slip or it travels on uneven ground. It’s easy to attach an EV3 Color Sensor looking down on the ground, to enable WALL-EV3 to follow a line.
Guessing Game for LEGO WALL-E
I programmed a simple number guessing arcade game, based on the old TAMAGOTCHI. The rules are simple. In each turn, WALL-E chooses a random number from 2 to 8, then it wait for you to guess if the next number will be higher or lower. You express the choice by pressing the right or the left button that are on his hands. Once you make you guess, WALL-E shows the number he was thinking. If you are right, he cheers, and you get a point, otherwise he’s disappointed and the life bar decreases. You can make 4 mistakes before the game is over. At that point, your final score is shown. Check out the video of LEGO WALL-E guessing game below.