Ok u are-doing something we dont know what,so tell us what and send us circuit or block diagram of the device u making.
motor, sensor and remote control receiver, peripherals and drivers ... give us background .
what kind of student what u know about electronics and why u care about ext device if u r doing programming.
if its for general knowledge google will help...unless u want to learn electronics for four-five years .
good luck
p.s. checkout the links below