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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)
Based on 1 ratings:
It does whatever arduino can but in smaller form factor + better control with the dedicated software