Teensy++ 2.0

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.

  • 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
  • 2" x 0.7" (50.8 x 17.8 mm)

Teensy++ 2.0 Product Help and Resources

HID Control of a Web Page

March 12, 2014

Learn how to move a slider on a webpage and make a motor spin. We connect HTML and HID to read sensors and interface with the physical world.

Choosing an Arduino for Your Project

December 11, 2017

Examining the diverse world of Arduino boards and understanding the differences between them before choosing one for a project.

Getting Started with the Teensy

June 18, 2015

Basic intro to the Teensy line of products, with soldering and programming suggestions.

Core Skill: Soldering

This skill defines how difficult the soldering is on a particular product. It might be a couple simple solder joints, or require special reflow tools.

2 Soldering

Skill Level: Rookie - The number of pins increases, and you will have to determine polarity of components and some of the components might be a bit trickier or close together. You might need solder wick or flux.
See all skill levels

Core Skill: Programming

If a board needs code or communicates somehow, you're going to need to know how to program or interface with it. The programming skill is all about communication and code.

3 Programming

Skill Level: Competent - The toolchain for programming is a bit more complex and will examples may not be explicitly provided for you. You will be required to have a fundamental knowledge of programming and be required to provide your own code. You may need to modify existing libraries or code to work with your specific hardware. Sensor and hardware interfaces will be SPI or I2C.
See all skill levels

Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

3 Electrical Prototyping

Skill Level: Competent - You will be required to reference a datasheet or schematic to know how to use a component. Your knowledge of a datasheet will only require basic features like power requirements, pinouts, or communications type. Also, you may need a power supply that?s greater than 12V or more than 1A worth of current.
See all skill levels


Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • mushoo / about 11 years ago / 5

    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!

    • Jon Mayer / about 10 years ago / 1

      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!

    • phibreoptic / about 10 years ago * / 1

      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.

  • Madboy #82637 / about 10 years ago / 2

    "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

    • Jon Mayer / about 10 years ago / 1

      Looks like PE3 is used for IUID, an assignment unique to the Teensy++. http://www.pjrc.com/teensy/schematic2pp.gif

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

      • Madboy #82637 / about 9 years ago / 1

        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)

  • GaretBiglow / about 10 years ago / 1

    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.

  • Sleepwalker3 / about 10 years ago / 1

    Now if only Paul (PJRC.com) and Brian (Embedded Man/ schmalzhaus.com) 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.

  • PhatJustice / about 10 years ago / 1


    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 PJRC.com 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.

  • phibreoptic / about 10 years ago / 1

    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

4.7 out of 5

Based on 3 ratings:

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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 !

Fantastic Teensy with tons of pins

I'm used to rewire an old telephone handset with lots of buttons and switches, and also to pair it with a PS/2 keyboard. The reason I bought this over a newer Teensy or LC is just because it is 5V tolerant, which saved me having to wire in a logic level shifter.

Only thing I didn't notice until I got it is that is uses a USB Mini (not Micro)- every other Teensy I have uses micro, so that was little bit of a surprise, since I didn't have a mini cable handy. (You never have the cable you need, right?)