general questions

[ccdjr106]

hii guys i havent been on in a while but i have a few questions
first off im looking to participate in the robofest   robofest.net
i want to do the robo power game competition 

sooo i was wondering if anyone has any advice for me like which kinds of sensors would work good   im not asking anyone to do it for me just some advice

i also bought this thing  http://www.robotshop.ca/dfrobot-2wd-mobile-platform-for-arduino-4.html?lang=en-us
i want to use a arduino soo which one will be capable of doing this competition
another thing  im pretty sure im going to need a motor controller for the platform that i bought    which one would be the cheapest that would work

thankss 

[z.s.tar.gz]

Well, there are only three kinds of sensors to really care about for a general autonomous robot.

Infrared - Narrow beam; Can't find narrow objects very well.
Ultrasonic - Wide beam; Doesn't work well if there are several going at once.
Camera - 2D sensing instead of 1D; Most complicated to operate.

You can do a combination of them if you want. I personally would go with IR.