[Solved] Pimoroni 11x7 LED matrix

Hardware
1

Hi,

I've been trying to get the Pimoroni 11x7 LED matrix to work on my Arduino Mega (also tried it on a Teensy 4.1).

I've tried to follow the advice on: Pimoroni 5x5 RGB Matrix to modify the Adafruit IS31FL3731 library to inlcude a subclass for the 11x7 board.

However, I can't even get any LEDs to light up, let alone control it. I'm sure it's wired up correctly at least (it's only +5V, GRD, SCL, and SDA).

I'm clearly doing something wrong and am very much an amateur here. If anyone can offer some help, it would be greatly appreciated.

My modified Adafruit_IS31FL3731 library is here: GitHub - S1mWa1k/Adafruit_IS31FL3731_11_7

and this is my attempt to implement it to just turn on a single pixel.

#include <Adafruit_GFX.h>
#include <Adafruit_IS31FL3731.h>
#include <Wire.h>

Adafruit_IS31FL3731_11x7 ledmatrix = Adafruit_IS31FL3731_11x7();

void setup() {

Wire.begin();
ledmatrix.begin();

}

void loop() {

    ledmatrix.drawPixel(1,1,20);
}
2

This is the board: 11x7 LED Matrix Breakout

3

Hi,
something is wrong in your library:
In the product datasheet it says that the I2C addresses are
either 0x75 or 0x77. (cut trace).
I2C interface (address 0x75/0x77 (cut trace)),

but you are using

#define ISSI_ADDR_DEFAULT 0x74

4

Yep, that's fixed it. Figured it would be something so simple, and it shows my ignorance.

Thank you!

5

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6

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