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Forum Index : Microcontroller and PC projects : USB Detect...

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Zonker

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Joined: 18/08/2012
Location: United States
Posts: 772
Posted: 09:16pm 09 Mar 2021
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Good afternoon gents...

I am laying out a new PCB using the 470 64 pinner...
I wanted to find an easy way to check if the end user has a USB connection enabled and thought of using pin 33, (input only & 5v tolerant), and just connecting it to pin 34 (USB 5v)... If USB is plugged in, pin 33 should be "high" and I could then send out a starting screen full of information to the Teraterm program... If "low" then I just ignore any USB user screens and continue on with the main program flow...

I was concerned when I looked at the schematic symbol name for pin 33 and saw that it could be used as a USB ID input pin... As far as I know the Micromite firmware does not use pin 33 in that way BUT, wanted to check with everyone before I connect the two pins together and write any code...  I don't think anyone has done this, so, maybe a question for Geoff or Peter...

I know... I am just a worry wart...  
 
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