Im totally new in using arduino .Im making a rc car using L293D motor driver shield.Can I connect a Lipo 3s 11.5V 2200 mAh battery directly with the driver as an external power supply?Will this burn the driver?
The underlying chip's datasheet says it's good for 36V, but you should consult the documentation of your shield (which is more than just the chip) to see what it says about that.
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I don't know and nor does anyone else because we have no idea what current / voltage the motors need.
How many motors do you want to drive?
im using 4 DC 12V motors
What is the stall current of the motors? That and the rated voltage are the important specifications to know when choosing a motor driver.
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You can find the stall current by measuring the resistance of the motor and then using ohms law with the supply voltage to calculate the current.
how can i measure the resistance of the motor..But i have known that the stall current of this motor is 1A
The stall current is 1A
Ohm meter across the connections.
To estimate the stall current, measure the motor winding resistance. Zero your meter lead resistance before measuring the motor coil resistance*. Take several measurements rotating the motor a bit between readings. Use the lowest reading in the calculation. The estimated stall current is the motor supply voltage divided by the true coil resistance.
*Touch the Ohmeter leads together and note the lead resistance. Subtract the lead resistance from the measured coil resistance to get true coil resistance.
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