Disha Karnataki;1384288:
i have a l293dne & i have connected it to my microcontroller as shown:Aspirations of a Software Developer: Image
connections to l293dne ic
pin 1 ,16,9 connected together to 5v supply of arduino
pin 8 is given to positive supply of 9v battery(to power motor of 6V-9V).
pin 4,5,12,13 given to ground of the battery along with ic supply ground(i.e arduino ground & motor supply ground together).
pin 2 5v supply from arduino
pin 7 0v from arduino
pin 3 & 6 voltage difference =6.4V i connected a 9v motor (@ 3 & 6 pin) But the motor is not running.
Then i took led and connected it(@ pin 3 & 6) litted & worked as per programing written in the arduino.
Then i tried with a 12V battery , the voltage @ pin 3 & 6 =9.4V sufficient enough to drive 9V motor but too did not run.
Then i took two 9v batteries connected in series =18v supply connected to pin 8 of the driver ic the voltage @ 3 & 6 =15.4V
but to 9V motor not rotating. I changed the driver ic no effect. Then i took a 12v motor & connected it rotated properly no problem.. But i do not want to use 12v motor as they may drain my batteries faster.
no problem in programing as it worked properly for the leds & also no problem with the motors because they work when i do not connect supply through the driver ic where is the problem? :0
If the LED turns on but the motor does not work, 2 possible reasons initially come to mind.
Your motor does not work. Try connecting it directly to the power supply for a few seconds, if it still doesn't work then that be the most likely problem or see below.
Your batteries can't supply enough current. On startup motors require a large spike of current to get past the at rest friction, maintaining its own speed require far less current in comparison.
Is this a lithium battery, those usually have enough current to do hobby motors, classic 9V ones have pretty poor current sourcing. And AA batteries have squat in terms of current capacity.
Hi, with the motor connected;
measure the voltage across the motor when it is supposed to be running
and measure the voltage across the motor supply battery as well.
Tom....... 
Can you post a picture of your project for us please?
Give up even thinking you can power a motor from a small 9V battery, you need
a pack of AA's, preferably recharghables. Motors need large currents, PP3-sized
9V batteries cannot supply large currents, except briefly as the voltage drops to a
few volts.