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Teensy is a cheap and powerful development board with some Arduino compatibility.

Teensy is a cheap and powerful development board with some Arduino compatibility. Through its teensyduino compability module, it can be programmed from Arduino IDE and use most of Arduino base code. Teensyduino replicates Arduino APIs, and many Arduino libraries can run on the Teensy.

Teensy 3 has much more power than most Arduino with a 32bits cortex-M4 (K20) processor, 64KB of RAM, 3 UARTs (hardware Serial) + 1 separated for USB, I2S, DMA SPI, multiple ADCs, etc... The Arduino compatibily offers a smooth migration path for a project started on an Arduino but needing a more beefy controller.

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