The Teensy 3.0 is an Arduino compatible 32-bit ARM Cortex M4 microcontroller developed by Paul Stoffregen. It packs an amazing amount of power and function into a "teensy" package.


  • 128K Flash Memory, 16K RAM, 2K EEPROM
  • 48 MHz clock speed (overclockable to 96 MHz)
  • 34 Digital I/O Pins (all with interrupt capability, 10 surface mount on the bottom of the board, and all 5v tolerant)
  • 14 13-bit Analog pins (10 shared with digital I/O pins, 4 surface mount on bottom of the board)
  • 10 PWM Channels
  • SPI, I2C, and 3 Hardware Serial Ports
  • 7 Timers for intervals/delays separate from PWM

The Teensy 3.0 also features an off-chip bootloader, meaning the entirety of the device's memory is available for programming and there is no delay at startup while the bootloader checks for a new program.