I make an Arduino standalone to drive a simple bluetooth RC Car from my Android phone. Using a
When I run my code on the Microcontroller eveything works fine, then I plug the Motor Driver and everything fails.
I need help with this issue? I dont know what's the problem.
I plug just one motor and works, but it doesnt works with the two motors plugged on the Driver Module.
T
John is right on the money with this one
Very DeJaVu as we answered a similar question just a few weeks ago
1. Are you powering the motors from the controller, if you are, dont, unless it is a real small motor it will cause problems, especially with two.
2. As John already said, Is your PSU up to the job and is it coupled to the motors correctly, you need only have a common ground between the motor controller and the micro-controller board
3. Draw us a picture and post it showing your connections and components (Even a cell phone picture will do, make sure it is well lit and shows all the parts
4. Attach or post you code in this thread for us to review for you
5. wait for us to review it all and get back to you, (That's is usually the quick bit)
6. apply changes recommended and if it is still not working go to 3 and repeat 
7. If all is working well, post your results (Other can benefit from your experience and you get points for it) and pat yourself on the back for a job well done
John is right on the money with this one
Very DeJaVu as we answered a similar question just a few weeks ago
1. Are you powering the motors from the controller, if you are, dont, unless it is a real small motor it will cause problems, especially with two.
2. As John already said, Is your PSU up to the job and is it coupled to the motors correctly, you need only have a common ground between the motor controller and the micro-controller board
3. Draw us a picture and post it showing your connections and components (Even a cell phone picture will do, make sure it is well lit and shows all the parts
4. Attach or post you code in this thread for us to review for you
5. wait for us to review it all and get back to you, (That's is usually the quick bit)
6. apply changes recommended and if it is still not working go to 3 and repeat
7. If all is working well, post your results (Other can benefit from your experience and you get points for it) and pat yourself on the back for a job well done
