Imagine an Arduino Shield that can be...
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This is the L293D Shield Motor high voltage integrator, high current and control 4 channels in one plate! Basically this means you can call DC motors and a source of tension over 36v that this chip is responsible for providing a maximum current of 600mA per channel. The L293D chip is also known as an H type bridge which is typically a circuit which allows a voltage to be applied to a load in any direction to an exit, such as a motor.
This Arduino Motor Shield is based on the L293D chip and with it you can control up to 4 DC motors, 2 servos or two motors Step!
The L293D chip has internally 2 H Bridge and supports an output current of 600mA per channel, that is, you can control up to 2 motors with 600mA each, as this Shield have 2 chips. Supported voltage 4,5-36V.
This Motor Shield L293D is compatible with Arduino Uno and Arduino Mega and you can check out various projects in the blog links at the end of the ad.