Even though you can program Trinket using the Arduino IDE, it's not a fully 100% Arduino-compatible. The 5V version can run at 8 MHz or at 16MHz by setting the software-set clock frequency. Use the 5V one for sensors and components that can use or require 5V logic. Use the 3V one to interface with sensors and devices that need 3V logic, or when you want to power it off of a LiPo battery. Both work the same, but have different operating logic voltages. You can't stack a big shield on it but for many small & simple projects the Trinket will be your go-to platform. In fact we even made some simple modifications to the Arduino IDE so that it works like a mini-Arduino board. We designed a USB bootloader so you can plug it into any computer and reprogram it over a USB port just like an Arduino. It's our lowest-cost arduino-IDE programmable board! The Attiny85 is a fun processor because despite being so small, it has 8K of flash, and 5 I/O pins, including analog inputs and PWM 'analog' outputs. Perfect for when you don't want to give up your expensive dev-board and you aren't willing to take apart the project you worked so hard to design. We wanted to design a microcontroller board that was small enough to fit into any project, and low cost enough to use without hesitation. This Pro Trinket development kit is the more powerful version of the Trinket (RS 124-5509, 124-5506) with around four times the perfoAdafruit Trinket - Mini Microcontroller - 5V Logic Trinket may be small, but do not be fooled by its size! It's a tiny microcontroller board, built around the Atmel ATtiny85, a little chip with a lot of power. And, for a serial connection, you can also use an FTDI cable to connect to the FTDI port. There’s even a reset button for entering the bootloader or restarting the program, plus LED signals for bootloading. You can easily programme the Pro Trinket with the AVRdude and/or the Arduino IDE. It’s powerful beyond its size too – the Pro Trinket features Microchips ATtiny85 MCU with 8KB program flash, 20 MIPS CPU, 5 PWMs, 2 8 bit timers, and it uses the Atmel ATmega328P microcontroller, 28K of flash, 2K of RAM and 18 GPIO. Thanks to its size, you can slip this board into pretty much any prototype. Coming in at a tiny 38mm x 18mm x 2mm (1.5″ x 0.7″ x 0.2″) (without headers), it gives you easy access to the ATtiny85 MCU for development and programming. Small is beautiful – and that’s especially true of the Adafruit Pro Trinket 5V development board.
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