Adafruit CharliePlex LED Matrix Bonnet

by Kattni Rembor

published March 13, 2019, last updated October 12, 2024

posted in Adafruit Products LEDs/ LED Matrices Raspberry Pi

5

Beginner

Product guide

Pinouts

The CharliePlex LED Matrix Bonnet includes the IS31FL3731 driver chip and 128 LEDs in an 8x16 matrix. Let's take a look!

The main pins used by the Bonnet are 5V, GND, SDA and SCL on the Raspberry Pi. We power the LEDs from the 5V supply, but the SDA/SCL logic level is still only 3.3V so it's safe!

IS31FL3731 Driver Chip

The IS31FL3731 drives the LED matrix via I2C.

8 x 16 LED Matrix

The 8 x 16 LED matrix on the CharliePlex Bonnet provides 128 LEDs.

Address Jumper

adafruit_products_CharliePlexBonnetPinouts_Addr_Jumper.jpg

The default I2C address for the Bonnet is 0x74. Solder this jumper closed to change it to 0x70 to avoid I2C address conflicts, if needed.

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