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PC & External PSU on the same power outlet, there is 7mV between PSU GND and USB GND. Do You mention to cut off USB GND (or I misunderstand You)?

My connection to external power and Teensy is good...

You are right: I was unsuccessfully cut VIN<>VUSB second time... For the bare eyes was clearly separated but it was'nt in reality as the mulimeter shows...

I fixed my bad, now PSU not starts...

I connected 3.3V to VIN and 3V3 on Teensy - orange blinks, I'm happy.

At the moment I connect USB cable cuses OverVoltageProtection in the PSU and PSU switch off it's power output. I'm unhappy :(...

@PaulStoffregen: Thanks Master to enlighten me!!!

I opened that "jumper" to separate VUSB and Vin. (to separate VUSB to 3.3V converter part - I thought opening jumper is good idea)

I hooked up...

CUT means I separate Teensy's inner parts from 5VUSB->3.3V->Teensy with a cut on PCB indicated by a heirline red line. And then I try to feed 3.3V from a PSU.

I can't understand this Pin 5-6 thing. I even not soldered a pin to that "pins" (holes)

I did not touched any part of Tennsy other than I soldered a minimal amount of pins (MISO was unnecessary for this OLED) - and no, I'm absolutely sure in that I did not touched PRG PIN (as any other...

Thanks for the tips. I did the 15S button press without any effect. Of course I immediatelly pulled out Tennsy from the breadboaord. Windows does not play a sound-affect as I plug it in the PC, and...

@Frank B - on the "plan" I did but no in real life! See photo: a socket soldered to 5V USB which is NOT connected to ground (I writing this 3th times). Not really visible well on the photo but VUSB...

As I wrote in the initial post: I did NOT shorten 5V USB to GND (as seen on the cited "plan"). A socket soldered over teensy, it's bottom part is not contacts the breadboard. I thing USB port also...

Thank You very much! No shortcut around soldered 5V USB.

I verified all the pins on OLED panel and no more than 3.2V, even when VCC=5V

I did not played with 3.3V out of Teensy - I thought that 5V USB will do the job as the SSD1306 manual says (if I interpreted well).

Of course I immediately removed Teensy from the board - no any sign of life :(

Feedback? No any SSD1306 output connected to Teensy input - isn't?

My HW developing career just downfall at the first project :(

I plugged USB cable to this Tennsy 4.0 before and it's blink example just ran nicely. After I plugged to this bread-board circuit it...

I using Android phone to skip 20/60 sec foreward/backward in podcasts and like to build an MP3 player which is able to do this on my bike. It is possible to do with teensy?

1st link is totally fulfills my technical and financial needs :D

So many thanks guys (like defragster, neurofun , and luni!), my native language is not English and with my disabilities I can't...

OK - I want something impossible? I still can't find a header which connects Teensy 3.2 to an IC socket. :( Yes, I'm lame.

Hi!

I like to ask the most noob question about Teensy boards: is there exists headers for these boards which fits into that circular IC-sockets/headers?

Sorry I'm not a practicing electroneer,...

Library https://github.com/MajenkoLibraries/MCP23S17, 3.3V - simple and straightforward. (and yes, I already know that I can't left reset line floating)

I also feel that there is no HW limit on CS...

I'm not too skilled in electronics (I'm a programmer), but I started to build a custom keyboard based on Teensy 3.2. In the following tale here are 4 questions:

Pre-face:

- First I played a...