With Easter just around the corner I thought it would be a great time to dust off my EV3 and build an egg decorating robot. These machines, commonly referred to as Egg Bots, have been around for a while. In fact, an early version dates all the way back to 1990! Since then, many versions have been created, some scratch built and some others using LEGO Mindstorms. I really enjoy the challenge of designing my own models, so here is my version, the EV Egg Bot! Instructions, program file, and notes for building your own can be found below. Other than the eggs and marker, all the pieces you need to build this model come in the EV3 Home Edition kit 31313.
The motors should be connected to the ports as follows:
Port A – the large motor that turns the egg
Port B – the medium motor that raises and lowers the marker
Port C – the large motor that moves the arm from side to side
Operating the EV Egg Bot is pretty straight forward. Once the program is running, you can use the left and right buttons on the EV3 unit to scroll through the available patterns and select the center button to ‘print’ it. Before decorating you’ll want to make sure the marker is about .5 cm/.25 in above the surface of the egg. I’m using standard Sharpie markers, but I think any felt tip marker that can draw on an egg will do.
The video should give you a pretty good idea of how it all works. Feel free to delve into the program file to design your own patterns!