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Thread: Teensy 3.6 will not run without USB

  1. #1

    Teensy 3.6 will not run without USB

    I am using external power so I cut the USB power link at the bottom of the board. The program will run as long as I have the USB cable in and programmed the device once. If I just power up normally it will not run. What have I missed?

  2. #2
    Senior Member+ KurtE's Avatar
    Join Date
    Jan 2014
    Hard to say without seeing code...

    Most common issue is something like: while (!Serial) ;

  3. #3
    Senior Member PaulStoffregen's Avatar
    Join Date
    Nov 2012
    Also check which version of Teensyduino you have. Click Help > About in Arduino.

    A problem with startup on 3.6 with slow rising power supplies was recently fixed. If you have an older version of the software and one of those slow-starting power supplies, you might be experiencing that problem.

  4. #4
    I have Teensyduino 1.45

    EDIT: I just noted that the latest version is 1.46. I am downloading

  5. #5
    Senior Member
    Join Date
    Oct 2015
    Roma (IT, EU)
    I second KurtE suggestion. Typical case is a loop waiting for Serial Monitor to show up.

  6. #6
    Thanks Paul the update did the trick

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