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I am a making a line follower with two dc motors. I am using a L293D motor driver shield with Arduino Mega.
enter image description here

Specification of the BO motors I am using:

Working voltage : 3V to 9V
30gm weight
Ability to operate with minimum or no lubrication, due to inherent lubricity.
1.9Kgf.cm torque
No-load current = 60mA, Stall current = 700mA

I tried powering both driver and the Arduino using a single 9V Alkaline battery by Panasonic at the arduino black jack. But the motor does not move at all. I had to use a

12V adapter ( 220v ac to 12v dc, 3A)

for this purpose.

Is it not possible to run the motors using 9V connected to the arduino power jack? I want to make it a battery powered system. So what are the alternatives (to using the adapter) ? I further want to use only a single power supply in my line follower.

Appreciate your suggestions in this regard.

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    It's not just the volts, it's also about the power the power supply can deliver. 9V batteries aren't exactly known for being limitless power devices. What motors do you have connected? What is the current rating of the 12V power supply at the output side? – Richard the Spacecat Jul 26 '18 at 10:28
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  • @RichardtheSpacecat 12v, 3A from adapter, and used BO motor. Kindly see my updated question. – gpuguy Jul 26 '18 at 11:24
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    The question is indeed entirely about the ill-chosen lossy bipolar driver chip and low current battery. That the controller is an Arduino is irrelevant. This should be closed as a duplicate of one of the many existing questions, not migrated. – Chris Stratton Jul 26 '18 at 14:11

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