Name: 4-Digit 7-Segment LED Matrix Display FeatherWing
Brand: Adafruit
SKU: 3088

Logical pinout · physical placement not verified

3V
FeatherWing power and logic rail. Adafruit Learn states the LED matrix uses only the 3V and GND pins for power and logic.
Type · PowerVoltage · 3.3V Feather rail; source notes current draw is about 40 mA for most uses.
GND
Ground return for the FeatherWing power and logic connection. Adafruit Learn states the LED matrix uses only the 3V and GND pins for power and logic.
Type · Ground
SDA
I2C data connection to the HT16K33 LED driver. Adafruit Learn states all LED control is done over I2C and SDA must be connected.
Type · I2CVoltage · 3.3V logic on Feather I2C bus.
SCL
I2C clock connection to the HT16K33 LED driver. Adafruit Learn states all LED control is done over I2C and SCL must be connected.
Type · I2CVoltage · 3.3V logic on Feather I2C bus.
A0
Address solder jumper. Adafruit Learn states A0 sets the lowest I2C address bit with value 1 when shorted.
Type · Analog
A1
Address solder jumper. Adafruit Learn states A1 sets the middle I2C address bit with value 2 when shorted.
Type · Analog
A2
Address solder jumper. Adafruit Learn states A2 sets the high I2C address bit with value 4 when shorted, allowing addresses 0x70 to 0x77.
Type · Analog

Pin	Type	Function	Voltage
3V	Power	FeatherWing power and logic rail. Adafruit Learn states the LED matrix uses only the 3V and GND pins for power and logic.	3.3V Feather rail; source notes current draw is about 40 mA for most uses.
GND	Ground	Ground return for the FeatherWing power and logic connection. Adafruit Learn states the LED matrix uses only the 3V and GND pins for power and logic.
SDA	I2C	I2C data connection to the HT16K33 LED driver. Adafruit Learn states all LED control is done over I2C and SDA must be connected.	3.3V logic on Feather I2C bus.
SCL	I2C	I2C clock connection to the HT16K33 LED driver. Adafruit Learn states all LED control is done over I2C and SCL must be connected.	3.3V logic on Feather I2C bus.
A0	Analog	Address solder jumper. Adafruit Learn states A0 sets the lowest I2C address bit with value 1 when shorted.
A1	Analog	Address solder jumper. Adafruit Learn states A1 sets the middle I2C address bit with value 2 when shorted.
A2	Analog	Address solder jumper. Adafruit Learn states A2 sets the high I2C address bit with value 4 when shorted, allowing addresses 0x70 to 0x77.

Logical pinout · physical placement not verified

Pin details

7 connections

3V
FeatherWing power and logic rail. Adafruit Learn states the LED matrix uses only the 3V and GND pins for power and logic.
PowerVoltage · 3.3V Feather rail; source notes current draw is about 40 mA for most uses.
GND
Ground return for the FeatherWing power and logic connection. Adafruit Learn states the LED matrix uses only the 3V and GND pins for power and logic.
Ground
SDA
I2C data connection to the HT16K33 LED driver. Adafruit Learn states all LED control is done over I2C and SDA must be connected.
I2CVoltage · 3.3V logic on Feather I2C bus.
SCL
I2C clock connection to the HT16K33 LED driver. Adafruit Learn states all LED control is done over I2C and SCL must be connected.
I2CVoltage · 3.3V logic on Feather I2C bus.
A0
Address solder jumper. Adafruit Learn states A0 sets the lowest I2C address bit with value 1 when shorted.
Analog
A1
Address solder jumper. Adafruit Learn states A1 sets the middle I2C address bit with value 2 when shorted.
Analog
A2
Address solder jumper. Adafruit Learn states A2 sets the high I2C address bit with value 4 when shorted, allowing addresses 0x70 to 0x77.
Analog

Start wiring

Shield

Confirm the data interface matches your host board.

Module pins: 3V, GND, SDA, SCL. Schematik maps them to your board in the app.

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Pinout