I'm a high school student, and I'm starting out building a robot based off of arduino, and I could really use some help with the electrical aspect of building a robot. Basically, the goal for this robot is to A) be able to follow a black line through a course and B) find an object after finishing the course. This would all be autonomous. Any feedback would be helpful.
Here are the components I plan on getting:
Arduino Mega 1x
Treads instead of Wheels 1x (http://goo.gl/TBmA0
Twin motor gear box 1x (http://goo.gl/LFoyX
PWM Motor Controller 1x (http://goo.gl/veCxE
Ultrasonic Sensor 2x (http://goo.gl/bwxvT
Light sensor Array (http://goo.gl/2j1q0
The twin motor gear box would be wired to the PWM controller, which would connect to the Arduino chip. The sensors would all also connect to the Arduino chip. I had a few concerns about this setup, which I hope can get answered here.
1) The specs for the motors are 1.5-4.5 volts with .66 amps which would provide us with a torque of 4.6 g*cm. The PWM controller we were planning on buying seems to supply only between 12-55v at a minimum of 3 amps. Would this present a problem, and is the torque provided by the motor sufficient for moving a sub-1/2 pound robot?
2) Is there even a need for a PWM controller, or is the motor's electrical needs low enough to be powered from the arduino chip itself?
Thanks for the help