Adafruit Trinket - Mini Microcontroller - 3.3V Logic
Deprecated 3.3V mini microcontroller using bit-bang USB. No longer recommended due to modern USB compatibility issues; Trinket M0 is the current replacement with native USB.
Pinout
- BAT+
Battery or external positive input. Adafruit states BAT+ is the Battery + Input pin for a battery, power adapter, solar panel, or other source, reverse-polarity protected.
Type · powerVoltage · Up to 16V DC; for 3V Trinket use at least 3.5V input, for 5V Trinket 5.5V or higher suggested. - USB+
USB 5V output, present only when Trinket is plugged into the Mini-B USB connector; can be used for USB power sensing or higher-current USB-powered loads.
Type · powerVoltage · 5V from USB, Adafruit notes 500mA+ available from USB ports. - GND
Common ground for logic and power, connected to USB ground and the regulator.
Type · groundVoltage · 0V - GPIO #0 / PB0
Digital input/output; PWM output; I2C data; SPI data input.
Type · gpioVoltage · 3.3V GPIO output level; Adafruit warns not to use with 5V inputs. - GPIO #1 / PB1
Digital input/output; PWM output; SPI data output; connected to the onboard LED.
Start wiring
USB · 3.3 V
Confirm the data interface matches your host board.
Module pins: BAT+, USB+, 3V, GND, GPIO #0 / PB0, GPIO #1 / PB1, GPIO #2 / PB2 / A1, GPIO #3 / PB3 / A3. Schematik maps them to your board in the app.
Other MCUs
225 other optionsSpecialists: Teensy for high-clock audio and USB, Adafruit SAMD boards running CircuitPython or the Arduino IDE, proper STM32 eval kits, and the micro:bit classroom ecosystem. Schematik builds target ESP32, Arduino Uno, and Pico; come here when you have a specific reason to.
Related groups
4 groups
10 I/Os PLC Module - CPU Arduino Nano (Optoisolated Output) visual preview
10 I/Os Relay Module - CPU Arduino Nano (Relay Output) visual preview
Adafruit METRO 328 - Arduino Compatible - with Headers visual preview
Adafruit Metro Mini 328 V2 - Arduino-Compatible - 5V 16MHz [STEMMA QT / Qwiic] visual previewArduino
About 75 boards across every Arduino generation: 5V Uno/Mega/GIGA, 3.3V MKR and Portenta, plus DFRduino and Bluno compatibles. Confirm the voltage rail before stacking any shield.
Boards · Arduino boards · 76 parts
10 I/Os Relay Module - CPU ESP32 (Relay Output) visual preview
Adafruit ESP32 Feather V2 w.FL Antenna - 8MB Flash + 2MB PSRAM visual preview
Adafruit ESP32-C6 Feather - STEMMA QT visual preview
Adafruit ESP32-S2 Feather - 4MB Flash + 2MB PSRAM visual previewESP32
Wi-Fi and Bluetooth on a single chip, in every shape from Espressif DevKitC to Adafruit Feathers with STEMMA QT, DFRobot FireBeetles tuned for battery life, and Seeed XIAOs under a thumbnail.
Boards · ESP32 boards · 111 parts
15x7 CharliePlex LED Matrix FeatherWing - Cool White visual preview
15x7 CharliePlex LED Matrix FeatherWing - Warm White visual preview
16-Ch High Current Driver Shield Kit v2 visual preview
19V 90W AC/DC Adapter for LattePanda Mu Full-Function EVA Carrier Board visual previewAdd-ons
About 270 add-ons across Pi HATs, Arduino shields, and FeatherWings. The same function — motor control, PoE, display — usually ships once per host connector family. Get the host board right first.
Boards · HATs, Shields & add-ons · 272 parts
Adafruit DVI Breakout Board for HDMI Source Devices visual preview
Adafruit DVI Sock for Pico - Works with HDMI Displays visual preview
Adafruit Feather RP2040 with DVI Output Port - Works with HDMI visual preview
Adafruit MACROPAD RP2040 Bare Bones - 3x4 Keys + Encoder + OLED visual previewPi Pico
The Raspberry Pi MCU line — Pico, Pico 2, and third-party boards on the same silicon — plus a deep bench of Pico-pinout displays, loggers, and radio modules that do nothing without a Pico plugged in.
Boards · Pico & RP2040 boards · 44 parts
