VUSB & VIN - Teensy 3.1

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M

Multitech

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Hi everyone, first post here.

I have a Teensy 3.1 board I want to power it with an external power supply, so I followed the directions here (image attached below) and cut the connection, but once I did it and connected the external power the board did not work. I connected the USB cable from my mac to see if that would have worked, but it did not, so I re-soldered the sliver I cut before with and connected the USB cable to check the board. After that, the board works as usual.

The VIN pin supplied voltage is a stable 5V and I have measured voltage on the VIN pin and under the board to check for false contact/miss-connections using both USB cable and VIN pin w/power.


Am I doing something wrong? should I have cut somewhere else? I have tired this more than once and if I remove the re-soldered connection the Teensy doesn't work by USB cable nor external supply via the VIN pin.


Thanks,


Teensy_VUSB.png
 
Parth11790: Your post was a little short of the details. Assuming you have cut VIN/VUSB and are powering via external power (like the OP), I suspect the Mac is being picky because you aren't drawing any power. If you get a powered USB 2.0 hub, and plug it in the Mac and plug the Teensy into the hub, it should work, because the Mac will see the hub, and not the USB adapter directly. This has been the standard answer with some of the other microcontrollers (notably the ATtiny85's). Because the Teensy is a USB 2.0 device, you want a USB 2.0 hub. With some of the other controllers, USB 3.0 slots in Macs, and USB 3.0 hubs had some problems that using USB 2.0 hubs plugged into either USB 2.0/3.0 slots did not have.
 
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Cut VUSB?

Hi Sorry
I have done nothing like cutting VUSB or so. I dont know much about it. I am trying to get rid of the EFI lock on Mac. Saw a video by overtch and bought the teensy 3.1. I uploaded his code on teensy 3.1. Works as i tested in on notepad on a PC.

What I am trying to do now is turn on MAC wait for the EFI screen. Then plug in the Teensy 3.1 using the USB (not a hub). I thought mac would power the teensy even on the EFI screen. Am I wrong? (Most likely yes based on your response.)

What do you advise I shall do?
 
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