The Teensy is a complete USB-based microcontoller development system, in a very small footprint! 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.

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

Specification	Teensy	Teensy++
Processor	ATMEGA32U4	AT90USB646
Flash Memory	32256	64512
RAM Memory	2560	4096
EEPROM	1024	2048
I/O	25	46
Analog In	12	8
PWM	7	9
UART,I2C,SPI	1,1,1	1,1,1
Price	$18	$24

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