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The shield motor with two L293D allows to control 4 inductive loads + 2 servos connected to the dedicated high-resolution Arduino timer for a control without jitter. In the case of motors, both speed and direction of rotation can be controlled independently in each channel. It allows control from simple projects to medium complexity.
WARNINGS: The outputs for the servos take their power directly from the 5 V of the Arduino plate, so it is well used by the small servos type hobby. If employing large high current servos, it is recommended that you cut off the power of the V + track on the guard and positive cable of the servo and test your own source (do not forget to connect the grounds).
The supply of the 4 outputs for motors or other inductive loads M1, M2, M3 and M4 is supplied with an external source. You can test the Arduino DC Jack (Pin Vin) or screw connector "EXT_PWR" on the shield; Selectable via the "PWR" jumper (If the jumper is available for the external source of the Arduino, connect the DC plug, and if it is not available, use the shielding screw connector). If you use the screw connector the shielding takes into account the polarity, since this input without diode polarity protection and a wrong connection result in damage of the screen and Arduino board. Also do not connect the regulated 5 V or 3.3 V output of the Arduino board to this input.
In any case the current of the external voltage source must be higher than the maximum consumption of the loads.
If you can control the motors from 4.5 V to 25 V. If the power supply with the external source was connected to the Arduino board, consult the voltage that supports this input, in the UNO, for example. It must go from 6 V to 12 V, so you can control motors only from 4.5 V to 10 V approx. According to the voltage of the source.
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