Availability: In stock
The Teensy is a breadboard-friendly development board with loads of features in a, well, teensy package. You can program for the Teensy in your favorite program editor using C or you can install the Teensyduino add-on for the Arduino IDE and write Arduino sketches for it.
The Teensy 4.0 is faster and capable of more projects. An ARM Cortex-M7 MCU at 600 MHz and more memory make up the key new features of this “teensy” board. Actual size is 1.4 by 0.7 inch, same form-factor as Teensy 3.2.
Features specific to Teensy 4.0:
More information is available on the website of PJRC.