The Pro Trinket 5V uses the Atmega328P chip, which is the same core chip in the Arduino UNO/Duemilanove/Mini/etc. So it's great once you've finished up a prototype on an official Arduino UNO and want to make the project smaller. The Pro Trinket PCB measures only 1.5' x 0.7' x 0.2' (without headers) but packs much of the same capability as an Arduino UNO. We also added Optiboot support, so you can either program your Pro Trinket over USB or with a FTDI cable just like the Pro Mini and friends. Like the Trinket, it has onboard USB bootloading support - we opted for a MicroUSB jack this time. That's why we designed Pro Trinket, with 18 GPIO, 2 extra analog inputs, 28K of flash, and 2K of RAM. Trinket's a year old now, and while its been great to see tons of tiny projects, sometimes you just need more pins, more FLASH, and more RAM. It's like an Arduino Pro Mini with more pins and USB tossed in, so delicious. Trinket's got a big sister in town - the Pro Trinket 5V! Pro Trinket combines everything you love about Trinket with the familiarity of the common core Arduino chip, the ATmega328. All have built-in USB and are comparable in price! The ItsyBitsy's especially are about the same size and have native USB and tons of pins, so they're a very close compatible.

So while we still carry the Pro Trinket, we really recommend using the Metro Mini (ATmega328 5V 16 MHz), ItsyBitsy 32u4 5V 16MHz, ItsyBitsy 32u4 3.3V 8MHz or ItsyBitsy M0 3V 48MHz. This Pro Trinket development kit is the more powerful version of the Trinket (RS 124-5509, 124-5506) with around four times the perfoWe still love the Pro Trinket but the bit-bang USB technique it uses doesn't work as well as it did in 2014. 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.

Adafruit trinket 5v schematics