Let's Make Robots!

Roombot, witch parts i need?

Hi all!

On my blog here you can folow the progress of my roombot.

For now, I just need a robot that moves on the outside of the room and always turn right if possible.

I want it to work with the ultrasound sensor.

For the rest, I really do not know what else I need to buy.

One or two servo's?
Witch microcontroller? (If i need one)

Later on Roombot, there will be 4-6 sensors on, so it must be able to upgrade the bot with them.

 

Can you guys give me a tip/start?

Thanks!