{"title":"Adafruit Pro Trinket - 3V","handle":"adafruit-pro-trinket-3v","url":"/products/adafruit-pro-trinket-3v","description":"\nNote: The Pro Trinket's bit-bang USB technique is a legacy approach that may not work reliably with modern operating systems. For new projects, consider an ItsyBitsy or Metro Mini board with native USB support at a comparable price.\n\n\nThe Adafruit Pro Trinket 3V is a compact ATmega328P-based microcontroller board that packs Arduino UNO-level capability into a 1.5\" × 0.7\" form factor. Running at 3.3V and 12 MHz, it's well suited for lower-power, lower-voltage projects. It's programmable via the Arduino IDE using the on-board USB bootloader or an FTDI serial connection.\n\nKey Features\n\n\nATmega328P Processor – Same chip as the Arduino UNO; compatible with 99% of Arduino sketches\n\n3.3V Logic at 12 MHz – Lower power consumption for battery and voltage-sensitive projects\n\n18 GPIO Pins – Including 2 extra analogue inputs beyond standard Trinket (pins 2 and 7 reserved for USB)\n\n28 KB Flash / 2 KB RAM – 4 KB used by bootloader, 28,672 bytes available for sketches\n\nMicro-USB Connector – For power and code uploads via USBtinyISP-compatible bootloader\n\nFTDI Header – Alternative serial programming and debugging via FTDI cable\n\n3.3V Regulator – 150 mA output, up to 16V input, with reverse-polarity and thermal protection\n\nAuto Power Switching – Automatically switches between USB and external battery power\n\nPower and Status LEDs – Green power LED and red LED on pin 13\n\nReset Button – Enter bootloader or restart your program\n\nMounting Holes – For secure physical installation\n\n\nLimitations\n\nPins 2 and 7 are reserved for USB and unavailable for general use\nNo Serial-to-USB chip — use an FTDI cable for serial monitor access\nCannot plug Arduino shields directly onto the board\n12 MHz clock speed may affect timing-critical libraries (NeoPixel library works fine)\n\n\nIdeal For\n\nCompact, low-voltage versions of Arduino UNO projects\nBattery-powered and portable builds\nWearable electronics and small-form-factor installations\nPrototyping before moving to a final embedded design\n\n\nPackage Contents\n\n1× Adafruit Pro Trinket 3V (assembled, without headers)\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":13972,"title":"Default Title","sku":"AF-2010","price":19.41,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":4,"option1":"Default Title"}]}