The "Wireless Aqua-Cleaner Robot" is designed to clean small debris from waterbodies. It is uses ATmega8 for processing the instructions and HC-05 for Bluetooth communication. It can be easily controlled using a PC or mobile application. It uses 3 simple DC motors as the only actuators and all the movements are produced using appropriate mechanisms. The robot won First Prize at IIT TechFest 2015 and was awarded the "Innovative Robot Design Award" as well.
YouTube Link: https://www.youtube.com/watch?v=4EfKsjD_I_4