A hardware based solution is proposed for indicating charging direction in a USB-C cable. The solution comprises of bi-color red/green LEDs attached to the connector of the USB-C cable. The LEDs are electrically connected and will glow when the USB-C supportive device is connected to the USB-C supportive system either for receiving or providing power. The device which is providing power or receiving power is identified by the color of the glowing LED at the specific end of the connector of USB-C cable, for example green could indicate providing end and red the receiving end. The LEDs are always connected in the opposite orientation on each end of the cable such that they always have opposing color.
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Roberts-Hoffman, Katie and Thompson, Bernard, "CHARGE DIRECTION INDICATING USBC CABLE", Technical Disclosure Commons, (March 24, 2016)