i need help

[msmile024]

What are the pads under the teensy 3.1 board for? There are pads for reset and D- and D+, but I see 6 more unlabelled pads.

 

[Theremingenieur]

If you bought your Teensy from an authorized distributor, it came with a card, explaining all pins and pads. Out of that, everything is well documented on the Teensy reference pages on the PJRC website, which is always the first place to look for information: https://www.pjrc.com/teensy/pinout.html

 

[PaulStoffregen]

I see 6 more unlabelled pads.

Those 6 are test points, which we use while testing every board. You can find them referenced on the schematic, if you're curious where they are actually connected.

https://www.pjrc.com/teensy/schematic.html

However, if you recently bought a Teensy 3.1 (which was discontinued over 3 years ago) it's very likely a counterfeit. How it actually is wired is anyone's guess.