I am using two motors ( from old two drill machines - same kind, these are 3.6v motors ), connected to arduino + arduino motor shield seeed studio v2.
I tried to use 18v/1.2a battery that was laying at home (from old machine ) what I have noticed is that motors are running for 3-5 seconds than stop, one of the red lights start blinking in the motor shield, then it stops for 3-5 seconds then it works again and loop.
Note: the motors are working when I connect them directly to 4.5 or 6v battery. But when I try to assemle everything , it doesn't work.
I tried 14v battery I noticed the same thing ( but slower, and this is something logical ), the battery of 9v don't make any move ( even by powering th arduino alone (using 9v) and the motors alone (9v) ).
What are things that I should consider here, any thoughts.
What did I miss? And what kind if battery should I use ??