Adafruit ItsyBitsy M0 Express - for CircuitPython & Arduino IDE

What's smaller than a Feather but larger than a Trinket? It's an Adafruit ItsyBitsy M0 Express!

USBPower pins
MicroUSB 5V power pin output.
Type · power
BATPower pins
Battery input from BAT pin.
Type · power
3VPower pins
3.3V regulator output.
Type · power
GNDPower pins
Common ground.
Type · ground
ENPower pins
Regulator enable; tie low to shut off regulator when on battery.
Type · power

Start wiring

Analog · I2C · UART

Confirm the data interface matches your host board.

Module pins: USB, BAT, 3V, EN, GND, A0, A1, A2. Schematik maps them to your board in the app.

Related groups

4 groups

Connectors

Sort passive connector adapters from Qwiic boards, LCD modules and microSD card adapters before assuming anything with the right plug will substitute safely.

Connectors & cables · Connectors · 28 parts

Displays

Character LCDs, SPI TFTs, e-paper modules and larger capacitive-touch TFT panels solve different display jobs. Treat display class, interface, controller, resolution, touch, refresh behaviour, storage, voltage and mounting as separate swap checks.

Displays · TFT & LCD displays · 33 parts

Air quality

Choose between MQ gas sensors, VOC/eCO2 indoor-air sensors, true CO2 modules and particulate sensors without treating every air-quality breakout as the same detector.

Sensors · Gas & air-quality sensors · 29 parts

MCUs and boards

ESP32, Arduino Uno, Raspberry Pi Pico, and compatible add-on boards for running builds.

Boards · Microcontroller boards · 24 parts

Pin	Position	Type	Function
USB	Power pins	power	MicroUSB 5V power pin output.
BAT	Power pins	power	Battery input from BAT pin.
3V	Power pins	power	3.3V regulator output.
GND	Power pins	ground	Common ground.
EN	Power pins	power	Regulator enable; tie low to shut off regulator when on battery.
RST	Control pins	digital io	Reset pin; tie to ground to reset/enter bootloader.
A0	Analog pins	analog	Analog input A0 and DAC analog output.
A1	Analog pins	analog	Analog input A1.
A2	Analog pins	analog	Analog input A2.
A3	Analog pins	analog	Analog input A3.
A4	Analog pins	analog	Analog input A4.
A5	Analog pins	analog	Analog input A5.
SDA	I2C pins	i2c	I2C hardware data pin.
SCL	I2C pins	i2c	I2C hardware clock pin.
RX	UART pins	uart	Serial1 receive input, GPIO #0.
TX	UART pins	uart	Serial1 transmit output, GPIO #1.

Pinout

Start wiring

Connectors

Displays

Air quality

MCUs and boards