Creative Commons images are CC BY 2.0

Description: The Teensy is a breadboard-friendly development board with loads of features in a, well, teensy package. The Teensy++ breaks out all of the IO available on the AT90USB1286 to breadboard-friendly 0.1" spaced headers so you can hook up a load of peripherals.

The Teensy++ comes pre-flashed with a bootloader so you can program it using the on-board USB connection: No external programmer needed! You can program the Teensy in your favorite IDE using C or you can install the Teensyduino add-on for the Arduino IDE and write Arduino sketches for Teensy!

Note: This does not come with a USB cable, please check below for an appropriate one.

Dimensions: 2" x 0.7" (50.8 x 17.8 mm)


  • 8-Bit AVR Processor (AT90USB1286)
  • 128K Flash Memory, 8K RAM, 4K EEPROM
  • USB Can Emulate Any Type of Device
  • Single Pushbutton Programming
  • Arduino Compatible
  • 8 Analog Inputs
  • 46 Digital I/O Pins
  • 9 PWM outputs
  • SPI and I2C


Recommended Products

Customer Comments

  • Gasp! Why are there no comments for this wonderful product. I’ve been using the Teensy ++ 2.0 on numerous things, but hands down the BIGGEST, MOST IMPORTANT THING: This board will, when you install the Teensyduino IDE, give you the option of appearing to your computer as a CLASS-COMPLIANT MIDI DEVICE. So, no more messing with DIN sockets/cables, or serial communication into MaxMSP, or whatever else you’ve been doing to get your sensor input into Ableton Live or any other DAW - just go straight in via the Teensy-as-MIDI, no drivers necessary.

    Oh, and it’s bi-directional, of course. Want to link your Ableton Live set’s tempo/MIDI Clock to that giant LED wall you’ve been building, or use Pro Tools to sequence a bunch of servos that smack hanging bags of cereal? Get a Teensy!

    • I love the Teensy boards. They have a bunch of I/O and the Teensyduino IDE actually optimizes some of the code base so they perform better than comparable Arduinos. The serial interface is also full speed of the USB bandwidth, which is crazy fast for serial communication.

      I’m using a Teensy++ right now for DIY arcade joysticks. So many options and cheap and small!

    • I agree, that fact that this board can run as a KEYBOARD, USB storage, MOUSE, MIDI, JOYSTICK and supports XPLANE!. No additional programming needed to do that, It would be a PITA to accomplish the same in Arduino. It is better than arduino, it’s nice to be able to program in the same language and IDE.

  • “breaks out all of the IO available on the AT90USB1286 to breadboard-friendly 0.1” spaced headers"

    You can see from the cheat sheet that this is nearly true. PE4, PE5, and PA7:0 are marked (interior), as in broken out to solderable holes but not on the edge– no big deal. Also you can see from the schematic that PE3 is NC. I found that out a while ago when trying to make sure I could still count :P

    • Looks like PE3 is used for IUID, an assignment unique to the Teensy++.

      I never noticed it wasn’t connected until I read your comment. All those pins, it’s easy to miss one.

      • It’s originally called IUID in the AT90USB646/647/1286/1287 datasheet. Normally it would be on pin 4 of the USB connector and pulled low by an OTG adapter so the USB subsystem could go into host mode, but only on the 647 or 1287 parts. I wonder why they didn’t provide a through hole for it since it’s still a digital IO pin… so I stole one. I cut the trace from the reset hole to the reset button and green-wired the pad to that trace so I could use the through-hole. (pic or it didn’t happen)

  • Teensy is the bomb, I wish Arduino would catch up and provide some class-compliant drivers for the leanardo and other boards with the atmega32u4.

  • Now if only Paul ( and Brian (Embedded Man/ would get together and make Bit Whacker work on the Teensy++2.0, that would be very cool! Then we could have a BitWhacker with lots of 5V I/O.

  • “PrintrBoard”

    There. I needed to leave the keyword because there is a gap in the documentation on how to get the Marlin firmware compiled before uploading it to the PrintrBoard with dfu-programmer. However, follow the documentation and install the module for the AT90USB1286 Arduino from and then compile and verify. If you don’t know where your .hex file ends up, look for “~/.arduino/preferences.txt” and add a “build.path={add-relative-path-here}”.

    Now I’m curious if I could make a Printrboard by using this Teensy.

  • This board is just as good as Arduino or BETTER. You can also use Arduino IDE and same wire language to program it.

    I highly recommend it

Customer Reviews

4.5 out of 5

Based on 2 ratings:

Currently viewing all customer reviews.

1 of 1 found this helpful:

Really awesome device

It does whatever arduino can but in smaller form factor + better control with the dedicated software

Excellent chip as expected

As described!! Fast delivery! And high quality !