![]() ![]() The shield has a 2-pin terminal block for External Power Supply. The shield comes with a pulldown resistor array, that keeps motors switched off during power-up. If the LED will not ON, it means the power supply is OFF. If the power supply is on the LED is turned on, the motor will work well. The on-board Power LED indicates the motor’s power supply. It just brought up top for easy to use purpose. This switch works same as the Arduino reset and it is used to reset the Arduino board. The RESET is nothing but the Arduino reset button. The shield has a 74HC595 shift register that extends Arduino 4 digital pins to the 8 direction control pins of two L293D chips.
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