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Detect if USB is connected

detec usb netduino

Best Answer Chris Walker, 28 April 2015 - 06:22 PM

Hi navinedrev,

Here is an adaptation of the code we use to detect VBUS during the manufacturing QA process... [ We do fairly thorough testing on each board :) ]

            InputPort vbusDetect = new InputPort((Cpu.Pin)0x09, false, Port.ResistorMode.PullDown);
            if (vbusDetect.Read() == false)
            {
                Debug.Print("VBUS not detected.");
            }
VBUS is "USB bus voltage". When a USB cable is connected, you'll see voltage (high state / true) on that pin. By using the PullDown internal resistor, one avoids getting false high readings from a disconnected (floating) pin.

Does that get you on the right path?

Welcome to the Netduino community,

Chris Go to the full post


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3 replies to this topic

#1 navinedrev

navinedrev

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Posted 28 April 2015 - 04:12 PM

Hello all. I'm new to Netduino.

 

I'm trying to detect if my Netduino is connected to USB for execute different code:

if(usbIsConnected){
     // Routine if have USB connection
} else {
    // Other Routine
}

How can I detect if USB is connected?



#2 Chris Walker

Chris Walker

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Posted 28 April 2015 - 06:22 PM   Best Answer

Hi navinedrev,

Here is an adaptation of the code we use to detect VBUS during the manufacturing QA process... [ We do fairly thorough testing on each board :) ]

            InputPort vbusDetect = new InputPort((Cpu.Pin)0x09, false, Port.ResistorMode.PullDown);
            if (vbusDetect.Read() == false)
            {
                Debug.Print("VBUS not detected.");
            }
VBUS is "USB bus voltage". When a USB cable is connected, you'll see voltage (high state / true) on that pin. By using the PullDown internal resistor, one avoids getting false high readings from a disconnected (floating) pin.

Does that get you on the right path?

Welcome to the Netduino community,

Chris

#3 navinedrev

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Posted 30 April 2015 - 12:45 PM

Yes. I've been testing it and works perfect!

 

Thanks a lot. I read your answers in other posts and I can only say: You are the man. Thanks for your work in this fantastic forum.



#4 Frode

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Posted 16 May 2015 - 04:47 PM

Chris, perhaps the code you use for QA could be hosted on GitHub? Seems like that would be code which is useful for developers wanting to figure out how to do stuff.





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