We are planning on building a sweeper robot. It will have a broom on the front and will be remote controlled.
Here are some Arduino projects that we looked at that we found intriguing:
A "Liquid Lifebar", which consists of a glass tube that has water in it. While the player plays a video game, the water level in the tube increases and decreases and changes color from green to red as the player gains and loses health.
A light up umbrella, that lights up in specific points where the raindrops hit it.
An LED coffee table that lights up when it senses something over it.
In action:
How he did it:
A "Crystal ball" that changes color when it senses heat.
Etch-a-sketch
Solar tracker
Motion sense water gun
Motorized pencil sharpener (hand-crank pencil sharpener hack) using light sensors, 3d printed gears, and DC brush motor
A cleaning robot: