Name: Adafruit Feather 328P - Atmega328P 3.3V @ 8 MHz
Brand: Adafruit
SKU: 0606034876811

Logical pinout · physical placement not verified

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 · USB
ENPower pins
3.3V regulator enable; connect to ground to disable regulator.
Type · Control
3VPower pins
3.3V regulator output.
Type · Power
RSTControl pins
Reset pin; tie to ground to reset AVR/launch bootloader.
Type · Control
ARefAnalog pins
Analog reference pin.
Type · Analog
SDAI2C pins
I2C data pin.
Type · I2C
SCLI2C pins
I2C clock pin.
Type · I2C
RXUART pins
Hardware serial receive pin.
Type · UART
TXUART pins
Hardware serial transmit pin.
Type · UART

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	USB	Positive voltage to/from micro USB jack if connected.
EN	Power pins	Control	3.3V regulator enable; connect to ground to disable regulator.
3V	Power pins	Power	3.3V regulator output.
RST	Control pins	Control	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.

Logical pinout · physical placement not verified

Pin details

11 connections

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

Start wiring

USB · 3.3 V

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.

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