Adafruit CharliePlex LED Matrix Bonnet - 8x16 Cool White LEDs

128-LED 16x8 CharliePlex LED matrix Bonnet in cool white, for any Raspberry Pi with a 2x20 connector. Driven by a built-in I2C CharliePlex controller.

Logical pinout · physical placement not verified

5V
Raspberry Pi 5V supply used to power the LED matrix on the Bonnet.
Type · PowerVoltage · 5V supply, per Adafruit Learn: LEDs are powered from the 5V supply.
GND
Raspberry Pi ground connection for the Bonnet.
Type · GroundVoltage · 0V ground reference.
SDA
Raspberry Pi I2C data line used by the IS31FL3731 LED-matrix driver.
Type · I2CVoltage · 3.3V logic, per Adafruit Learn: SDA/SCL logic level is still only 3.3V.
SCL
Raspberry Pi I2C clock line used by the IS31FL3731 LED-matrix driver.
Type · I2CVoltage · 3.3V logic, per Adafruit Learn: SDA/SCL logic level is still only 3.3V.
Address jumper
I2C address-select jumper for the IS31FL3731 driver; public connector/control content, not a Raspberry Pi header pin.
Type · Control

Pin	Type	Function	Voltage
5V	Power	Raspberry Pi 5V supply used to power the LED matrix on the Bonnet.	5V supply, per Adafruit Learn: LEDs are powered from the 5V supply.
GND	Ground	Raspberry Pi ground connection for the Bonnet.	0V ground reference.
SDA	I2C	Raspberry Pi I2C data line used by the IS31FL3731 LED-matrix driver.	3.3V logic, per Adafruit Learn: SDA/SCL logic level is still only 3.3V.
SCL	I2C	Raspberry Pi I2C clock line used by the IS31FL3731 LED-matrix driver.	3.3V logic, per Adafruit Learn: SDA/SCL logic level is still only 3.3V.
Address jumper	Control	I2C address-select jumper for the IS31FL3731 driver; public connector/control content, not a Raspberry Pi header pin.

Logical pinout · physical placement not verified

Pin details

5 connections

5V
Raspberry Pi 5V supply used to power the LED matrix on the Bonnet.
PowerVoltage · 5V supply, per Adafruit Learn: LEDs are powered from the 5V supply.
GND
Raspberry Pi ground connection for the Bonnet.
GroundVoltage · 0V ground reference.
SDA
Raspberry Pi I2C data line used by the IS31FL3731 LED-matrix driver.
I2CVoltage · 3.3V logic, per Adafruit Learn: SDA/SCL logic level is still only 3.3V.
SCL
Raspberry Pi I2C clock line used by the IS31FL3731 LED-matrix driver.
I2CVoltage · 3.3V logic, per Adafruit Learn: SDA/SCL logic level is still only 3.3V.
Address jumper
I2C address-select jumper for the IS31FL3731 driver; public connector/control content, not a Raspberry Pi header pin.
Control

Start wiring

Shield

Confirm the data interface matches your host board.

Module pins: 5V, GND, SDA, SCL. Schematik maps them to your board in the app.

Add-ons

269 other options

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.

View all 269

Related groups

4 groups

Arduino

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 · 77 parts

ESP32

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 · 159 parts

Other MCUs

Specialists: 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.

Boards · Other MCU boards · 229 parts

Pi 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 · 43 parts