Trinket may be small, but do not be fooled by its size! It's a tiny micro-controller board, built around the Atmel ATtiny85, a little chip with a lot of power.

 

Adafruit Trinket 3.3VDC

$10.00Price
    • ATtiny85 on-board, 8K of flash, 512 byte of SRAM, 512 bytes of EEPROM
    • USB boot-loader with a nice LED indicator looks just like a USBtinyISP so you can program it with AVRdude(with a simple config modification) and/or the Arduino IDE (with a few simple config modifications)
    • Mini-USB jack for power and/or USB uploading, you can put it in a box or tape it up and use any USB cable for when you want to reprogram.
    • Adafruit really worked hard on the boot-loader process to make it rugged and foolproof, this board wont up and die on you in the middle of a project!
    • ~5.25K bytes available for use (2.75K taken for the boot-loader)
    • On-board 3.3V or 5V 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 (such as a battery) - it'll automatically switch over
    • On-board green power LED and red pin #1 LED
    • Reset button for entering the boot-loader or restarting the program. No need to unplug/replug the board every time you want to reset or update!
    • 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!
    • Mounting holes! Yeah!
    • Really really small

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