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Teensy 3.1, $19.80
Teensy 2.0, $16.00
Teensy++ 2.0, $24.00
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Teensy USB Development Board

The Teensy is a complete USB-based microcontroller development system, in a very small footprint, capable of implementing many types of projects. All programming is done via the USB port. No special programmer is needed, only a standard "Mini-B" USB cable and a PC or Macintosh with a USB port.

Update: Discussion / Support Forum


Teensy 3.1 changes from Teensy 3.0


Key Features:
  • USB can be any type of device
  • AVR processor, 16 MHz
  • Single pushbutton programming
  • Easy to use Teensy Loader application
  • Free software development tools
  • Works with Mac OS X, Linux & Windows
  • Tiny size, perfect for many projects
  • Available with pins for solderless breadboard
  • Very low cost & low cost shipping options
SpecificationTeensy 2.0Teensy++ 2.0Teensy 3.0Teensy 3.1
ProcessorATMEGA32U4
8 bit AVR
16 MHz
AT90USB1286
8 bit AVR
16 MHz
MK20DX128
32 bit ARM
Cortex-M4
48 MHz
MK20DX256
32 bit ARM
Cortex-M4
72 MHz
Flash Memory32256130048131072262144
RAM Memory256081921638465536
EEPROM1024409620482048
I/O25, 5 Volt46, 5 Volt34, 3.3 Volt34, 3.3V, 5V tol
Analog In1281421
PWM791012
UART,I2C,SPI1,1,11,1,13,1,13,2,1
Price$16.00$24.00$19.00$19.80

Teensy Loader Application

The Teensy Loader makes getting code into your Teensy easy. Just press and release the reboot button and the processor runs the HalfKay bootloader, which is automatically detected. Teensy Loader lets you download your code and reboot to it.

Automatic mode downloads and reboots to your code the instant your computer detects HalfKay. The latest version of your code is always used. Just press the button and within 1 to 2 seconds your latest code is running!

Software Development Tools

WinAVR C compiler.

Teensyduino, add-on for Arduino IDE.

Simplified USB Examples or Dean Camera's LUFA library.

Breadboard Usage

The Teensy is available with header pins, for direct no-soldering-required use on a breadboard, which can also be run from the +5 volt from the USB cable. Standard Teensy boards come with solder pads. Either way, all Teensy boards come fully assembled and tested, so no surface mount soldering is needed.


The Teensy with header pins is easy to use with a solderless breadboard

The 128x64 Graphics LCD can be used with Teensy 2.0 and Teensy++ 2.0 and Teensyduino using this GLCD library. They fit together nicely on a single breadboard.


Teensy++ 2.0 with 128x64 Graphics LCD