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LED to indicate activity on a USB port

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Ali.Soliman

Joined Sep 14, 2012
5
Hi guys

I am trying to use an LED to indicate activity on a uUSB port (flashing)

I used a FET (FDV301N) connected to the VBUS and then to the LED

Will this work?

Is the VBUS always 5V when a USB device is connected or does it change value while device active/inactive.

I attached a screenshot of my circuit.

thanks you.
 

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ErnieM

ErnieM

Joined Apr 24, 2011
8,415
VBUS is always 5 volts when plugged into the host. It's there to power your slave device.

To indicate activity you have to add some code into your device (plus a pin to drive the LED).
 
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