Adafruit Trinkets

Adafruit Trinkets are tiny microcontroller boards that are Arduino-IDE programmable and built around the Atmel ATtiny85, a little chip with a lot of power. The Trinket is small enough to fit into any project and low cost to use without hesitation. The Attiny85 has 8K of flash, and 5 I/O pins, including analog inputs and PWM 'analog' outputs. A USB bootloader allows the Trinket to plug into any computer for reprogramming over a USB port, just like an Arduino. 

Two versions of the Trinket are available, a 3V and 5V. Use the 3V for sensors and devices that need 3V logic, 5V for sensors, and devices that need 5V logic. The Trinkets can be powered with a LiPo battery and the 3V version should only run at 8MHz. The 5V version can run at 8MHz or at 16MHz by setting the software-set clock frequency. Even though the Trinket can be programmed using the Arduino IDE, it's not fully 100% Arduino-compatible.


  • Atmel ATtiny85 on-board, 8K of flash, 512 bytes of SRAM, 512 bytes of EEPROM
  • Internal oscillator runs at 8MHz but can be doubled in software for 16MHz
  • USB bootloader with a nice LED indicator to program with AVRdude (with a simple configuration modification) and/or the Arduino IDE (with a few simple configuration modifications)
  • Micro-USB jack for power and/or USB uploading, use any USB cable to reprogram
  • ~5.25K bytes available for use (2.75K taken for the bootloader)
  • Available in both 3V and 5V
  • On-board 3.3V or 5.0V power regulator with 150mA output capability and ultra-low dropout
  • Up to 16V input, reverse-polarity protection, thermal and current-limit protection
  • Power with either USB or external output
  • On-board green power LED and red pin #1 LED
  • Reset button for entering the bootloader or restarting the program
  • 5 GPIO - 2 shared with the USB interface
  • The 3 independent IO pins have 1 analog input and 2 PWM output as well, the 2 shared IO pins have 2 more analog inputs and one more PWM output
  • Hardware I2C / SPI capability for breakout & sensor interfacing
  • Works with many basic Arduino libraries including Adafruit Neopixel


Adafruit Trinkets


Publicado: 2016-07-12 | Actualizado: 2022-03-11