I am an bus-boy at an Italian restaurant and once monthly we have event called wine tastings, the waitress goes around and pours wine and every fifteen minutes or so a bus-boy that is brought in just for the event goes around and passes out food on a large tray. Because of labor laws and school (during the school year) the bus-boy's only job during these wine tastings is to pass out food and total the bus-boy is getting paid 6-7 hours wages for only an hours worth of work. Me being lazy and labor cost conscience think that it is just a waste of money to have a bus-boy when a robot could do the job for only the money to charge it up.
My idea is to take the iRobot create and add a visual "People" sensor and a weight sensor to make a robo-bus-boy, or a bus-bot, I haven't really decided. In order to do this I will have to wire a series of LED's into a power source. One series of LED's must be blue, signaling a command to take the plates on the bot. Another series must be red signaling to place plates that are finished on there, flashing red LED's will mean that the robot is at weight capacity and will go back to a specified area to unload the trays by the normal bussers. Now the three problems I have not explained yet are as follows: Sliding plates, making a shoulder level, high-class, stylish stand, sensing when the bot is at weight capacity.
To make the plates not slide I will use a clear rubber "gripping" substance that I have rolled up from when I had carpet in my computer room. To make the bot stylish and not at all an eye sore I will use an aluminum sheet metal and the waitresses trained style eye. For the weight capacity issue I will wire and electronic scale to the bot and program it to change the LED color when a certain weight is reached and in some cases when the max weight is reached will change the behavior of the bot from making laps around the dinning room to going to the wait station. When at the weight station the bot is reloaded and a reset switch is pressed and the LED change to blue; then laps are resumed and the process repeats till there are no more people left.