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question about arduino and supply current

hi guys, I just bought a ucam ttl jpeg camera for my arduino and have some very basic questions.

Reading the dataset it says that to power the camera it require 3.0V to 3.6V DC range nominal 3.3V. So I plug it into the 3.3V pin from my arduino mega, setted it up and it worked.

However, im a little confused about the specifications from the datasheet.Namely it says that

Supply Current (ICC) VCC =   3.3V    58(min) 62(typical) 76(max)   mA

But the current draw from the 3.3v pin, according to the website is only 50mA.

how to get wheel velocity

Hi guys,

I am taking "control of mobile robots" course on coursera and is pretty intrigued in building a 2 wheel robot car. One of the issues was the control of the 2 wheel velocities here.

So far, I've got a Uno and bought the magician chassis from sparkfun. It provides 2 dc motors. May I know using the dc motors, is it sufficient to be able to know and  control the individual wheel velocities? 

confused about how to drive a rc car using arduino

hi folks, I am trying to build an autonomous car by attaching my arduino uno r3  to my rc car. Please pardon me if there are certain stuff I don't understand as my electronics knowledge has long vaporised since my education days and im starting from zero again.

In particular, i'm using this guide http://www.instructables.com/id/Autonomous-Control-of-RC-Car-Using-Arduino/?ALLSTEPS as my RC car is also using a RX-2B chip.