Teensy

Teensy is a family of compact, high-performance microcontroller development boards produced by PJRC. Despite their small footprint, Teensy boards offer processing speeds, memory, and peripheral sets that significantly exceed those of standard Arduino boards, while remaining fully compatible with the Arduino IDE.

Key features include hardware USB device support — enabling Teensy to appear as a MIDI instrument, keyboard, mouse, or joystick — a floating-point DSP core for real-time audio processing, and a rich set of I2C, SPI, and serial peripherals.

Teensy boards are used in professional audio projects, USB MIDI controllers, synthesisers, lighting controllers, motion capture systems, and any application where Arduino compatibility is needed alongside high clock speeds, low latency, and rich hardware peripheral support.