Hi there!
I´ve followed all steps (http://www.instructables.com/id/Control-your-motors-with-L293D-and-Arduino/?ALLSTEPS) in creating my first robot, but my DC motors aren´t reveiving much energy, because they are excessively low.
I´ve asked about this before, and all responses lead me to the one and only conclusion: I needed to get a voltimeter in oprder to check the current voltage.
Now I´ve got one, but how may I test how much current the motors are receiving? I haven´t found a video or instructable to get a dc motor checkout. Should I turn on the arduino and while the motors are running (very slowly) should I touch each motor cable with the two cables that come with the voltimeter? Both cables that came from the DC motors are not positive nor negative ones... how may I choose in which order to test it?
The Vin pin is attached to three AA batteries that came with the robot, maybe those are the problem? (I´ve grab one of those and tested it and it says 1.4 -I´ve set the voltimeter to the "200" in its left side-).
Sorry for my lousy english... and my very, very basic question! Thanks for your help! Rosamunda