Tuesday, 18 April 2017

transistors - Detecting When a USB Device Is Plugged In For Status LED


I've seen this asked a few times, but no definitive answers. I've also been Googling this for a couple days now with no definitive solutions. So time to ask...


I'm building a fast charge USB charging station. I'd like to light a status LED next to the port when a USB device is plugged in. Really basic. Really straightforward.


I found this diagram below, and was wondering if it could be modified to omit the phototransistor. I just want an LED to light, maybe when a transistor is pulled HIGH\LOW. It seems like it would only be 3 parts: LED, transistor, and resistor.


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