I have two DC-motors driven by single h-bridge L293 as described in http://itp.nyu.edu/physcomp/Labs/DCMotorControl. H-bridge is driven by Arduino Uno. My problem is how can i measure the current dc-motor is takeing from L293. Stall current of motors are about 0,5 A and i have some 0,5ohm resistors to use but how can i connect them to be able to measure the voltage drop ? Or do i have to use one L293 for each motor and connect all ground pins through resistor to ground ?
Are all ground pins 4,5,12 and 13 seems to be internally connected together ?