I've a little project with Arduino UNO, Ardumoto shield and a LCD shield, but I'm having some trouble to power up everything. Without any motor connected to Ardumoto I can run my program and get appropiate feedback from the LCD when using the power from the USB output. However, once I switch to a 9V supercell battery the LCD doesn't respond as programmed, showing some strange characters.
I'm still not dealing with the issues that can arise when connected an indepenent power supply to drive the motor, but it seems to me that the 9V supercell battery can't power up the Arduino board plus 2 shields. Is that right? Should I use a different battery?
Thanks in advance