Adafruit Feather 328P - Atmega328P 3.3V @ 8 MHz

With this Feather we're getting a little nostalgic for the ATmega328P - the classic 'Arduino' chip - with this Adafruit Feather 328P running a 3.3V and 8 MHz.

GNDPower pins
Common ground for all power and logic.
Type · ground
BATPower pins
Positive voltage to/from JST jack for optional LiPoly battery.
Type · power
USBPower pins
Positive voltage to/from micro USB jack if connected.
Type · power
ENPower pins
3.3V regulator enable; connect to ground to disable regulator.
Type · power
3VPower pins
3.3V regulator output.

Start wiring

Analog · I2C · UART

Confirm the data interface matches your host board.

Module pins: BAT, USB, EN, 3V, GND, ARef, SDA, SCL. 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.

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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
GND	Power pins	ground	Common ground for all power and logic.
BAT	Power pins	power	Positive voltage to/from JST jack for optional LiPoly battery.
USB	Power pins	power	Positive voltage to/from micro USB jack if connected.
EN	Power pins	power	3.3V regulator enable; connect to ground to disable regulator.
3V	Power pins	power	3.3V regulator output.
RST	Control pins	digital io	Reset pin; tie to ground to reset AVR/launch bootloader.
ARef	Analog pins	analog	Analog reference pin.
SDA	I2C pins	i2c	I2C data pin.
SCL	I2C pins	i2c	I2C clock pin.
RX	UART pins	uart	Hardware serial receive pin.
TX	UART pins	uart	Hardware serial transmit pin.

Pinout

Start wiring

Connectors

Displays

Air quality

MCUs and boards