Hi everyone,it only works when it's connected with the USB (although it's powered by an external alimentation).
We've also tried to change pins values by using "digitalWrite(pin, HIGH)" and digitalWrite(pin, LOW)", in order to control qith those pins a DC motor driver. We know that the driver works, so we don't understand why we can control it qith the arduino.
there is a "typo" there, not sure if it will matter: "OUTOUT" instead of OUTPUT.
I will bet that the motor driver problem is with the connections and not the Arudino. Do you have 'ground' connected from Arduino to the motor driver?