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Adafruit 2010 Pro Trinket 3.3V ATmega328 12MHz 28K FLASH 18 GPIO

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Brand: Adafruit MPN: 2010 EAN-13: 0700161460759
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The Pro Trinket uses the ATmega328 common-core chip to give a microcontroller similar to the Arduino Pro Mini but with USB and more pins. The Trinket is designed with 18x GPIO pins, 2x extra analog inputs, 28K of FLASH and 2K of RAM. There is onboard USB bootloading support (via a micro USB jack) and Optiboot support enable programming over USB or with a FTDI cable.

This 3.3V version operates at 12MHz and is Arduino compatible, working with 99% of existing Arduino sketches. There is no serial to USB chip and the USB connection is for uploading new code only. The Trinket is programmable using the AVRdude and/or the Arduino IDE, and there is a reset button for entering the bootloader or restarting the program as well as LED indication for bootloading.

  • PCB measures only 38.1 x 17.78 x 5.08 mm (without headers)
  • Mounting holes
  • Once headers are installed they can be fitted into 0.6" wide sockets
  • Pins #2 and #7 not available (they are exclusively for USB)
  • Up to 16V input
  • Ultra low dropout regulator
  • Reverse polarity protection, thermal and current-limit protection
  • Maximum sketch size is 28,672 bytes
  • Bootloader does not affect RAM usage
  • Power with either USB or external output (e.g. battery) - with automatic switch over

Learning tips and tutorials can be seen here.

*Customers looking to resell on eBay or Amazon should contact Adafruit directly.

Order codeMftrs Part No.
75-05092000Adafruit 2000
75-05102010Adafruit 2010

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*Question functionality currently disabled

23 March 2017 Question by: Rafae | Product code: 75-0510
Q. Would that be possible to programmatic access to the USB like in the case of arduino uno where modification of code allows to work it like keyboard or mouse. Is it possible to communicate with board using a terminal ?
A. Hi Rafae, thank you for your question. This is programmable using a PC terminal. For full manufacturer information please see here.


Mini Version Of The Arduino Uno

Reviewed by: Morgan Winters - 06 April 2018
I picked up one of these for a user interface for a pet cage. I'd already another one I bought from somewhere else but it is a 5V 16MHz version. I needed the 3.3V version as the UI uses serial connection to a Raspberry Pi, I didn't want to use a level shifter for the different logic voltages. For my use and indeed, most project, the difference between the 12MHz and 16MHz is not noticeable so don't let the different clock speeds put you off getting the 3.3V version. Regardless, Adafruit did a great job designing this, it a rugged little device and uses very little power (9mA running Arduino's blink example (according to my bench power supply)). When I said little, the ProTrinket is only 38mm long by 18mm wide and 2mm high, excluding header pins. These header pins come with the ProTrinket but are not soldered to the board, you'll need to solder them on yourself, if you choose to use them. The ProTrinket is basically a mini Arduino Uno, it uses the same Atmel Atmega 328P chip, you get 32Kb of storage space, 28672 bytes once you take into account the bootloader and you get 2Kb of RAM. Once you make few simple config modifications, you can use the Arduino IDE to program your sketch and the ProTrinket can run pretty much run any Arduino Uno sketch. You get 6 PWM pins which can be used as PWM outputs or digital inputs or output plus 4 more digital input/output pins, 8 analogue input pins with a analogue reference pin, A4 and A5 can used as analogue inputs or for bi-directional I2C, you also get 2 serial UART pins. You can power the device through the USB connector or through the BAT pin. There is a voltage regulator onboard so you can power the ProTrinket with upto 16VDC. The voltage regulator can output upto around 150mA and if needed, you can power other things from the 3V or 5V pins, depending on version. Please note, unlike the full size Arduino Uno, the ProTrinket does not have an Atmega16U2 chip for the USB. Adafruit have made pins 2 and 7 unavailable and are used exclusively for USB, The Atmega16U2 chip has been done away with and the device uses a modified bootloader, as a result, one can only upload new sketches for a limited time when the device starts up. Pin 13 has a LED attached, while this is pulsing, you can upload new code. There is an onboard reset button to restart the device,it will then re-enter the sketch upload halt period. Also note that there is no serial via USB so you cannot use the ProTrinket to make a keyboard/mouse/gamepad type USB controller. The USB is only for uploading new code at startup and for powering the device, nothing else. The UART serial pins have been broken out and serial communication is still possible through the RX/TX pins, you just can't use the USB for serial or use the Serial Monitor with the Arduino IDE. You can use the FTDI port if you have a cable but I have never used FTDI nor know how it works so I can't offer any review on that. All in all, if you don't need serial through USB, the ProTrinket is a great low cost alternative to the Arduino Uno but in a far smaller package. Ideal for those projects where the capability of the Arduino Uno is needed but size and power is limited. A great little device, well made by Adafruit and topped off with perfect service yet again from Rapid Electronics.