Teensy 3.6 will not run without USB

[mariusl]

Hi
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?

 

[KurtE]

Hard to say without seeing code...

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

 

[PaulStoffregen]

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.

 

[mariusl]

Paul
I have Teensyduino 1.45

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

 

[XFer]

I second KurtE suggestion. Typical case is a loop waiting for Serial Monitor to show up.

 

[mariusl]

Thanks Paul the update did the trick