Retired Product

This product has been retired from our catalog and is no longer for sale. This page is made available for those looking for datasheets and the simply curious.

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 2.0 breaks out all of the IO available on the ATMEGA32U4 to breadboard-friendly 0.1" spaced headers so you can hook up a load of peripherals.

The Teensy 2.0 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: 1.2" x 0.7" (30.5 x 17.8 mm)


  • 8-Bit AVR Processor 16 MHz (ATMEGA32U4)
  • 31.5K Flash Memory, 2.5K RAM, 1K EEPROM
  • USB Can Emulate Any Type of Device
  • Single Pushbutton Programming
  • Arduino Compatible
  • 12 Analog Inputs
  • 25 Digital I/O Pins
  • 7 PWM outputs
  • SPI and I2C


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Customer Comments

  • This is a seriously awesome board. Built it into a custom mechanical keyboard (an ErgoDox). Ordering another for other USB emulating projects.

  • These are great, I implemented a 24-channel phase control dimmer with one. Used one I/O for the zero crossing detector input, and the other 24 to switch triacs via opto-triacs. Controlled with simple serial commands over USB (supports both the usual Renard computer controlled dimmer protocol or my human-readable one).

    • Very slick! I would love more info on your setup. Any links/code/etc for the project?

  • Is this board open source? I want to use it in a project that requires parts be available for at least ten years. Open source parts qualify.

    • I’m afraid that the Teensy line is not open source. While the parts themselves can be easily sourced and probably will be for another 10 years, the bootloader (think of it as ‘firmware’) that makes it tick is very much closed. You could try to negotiate a support contract with its author PJRC or try to purchase a large stock of pre-programmed chips / full boards, but perhaps there are alternativee products you could explore as well.

      • Don’t forget you can change the bootloader and use an open source one, or just use a different ATMega32U4 based breakout (like our Pro Micro).

        • Of course you can replace the Teensy Halfkay bootloader with e.g. LUFA (no idea if that works on Teensy 3.0 yet, another thing to consider), but at that point (requiring additional steps) I’d just go for e.g. the Pro Micro directly

  • hi, what is the bootloader used and how burn in ATMEGA 32U4 ? Thank :)

  • By far my favorite dev board.

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