Arduino Uno and library MD_MAX72xx [SOLVED]


I’m trying to test my Uno board and 8x8 led matrix with the MD_MAX72xx_HW_Mapper example of the library.

My hardware and my wiring is good, as I can run some sketches of the LedControlMS library
before. (so I changed the pin assignement in the MD_MAX72xx_HW_Mapper example)

The serial monitor show me this :

n⸮G⸮⸮SR⸮B⸮⸮⸮Rb2CN4jFX ⸮B⸮

What could it be ?

a sketch like this

void setup() {

void loop() {
    Serial.println("Hello world");
    delay(2000); // wait two seconds

output me a good "hello world"

Make sure the baud rate menu in the bottom right corner of Serial Monitor matches the setting in the Serial.begin() statement of your code.

Hahaha Thanks !

Newbie question !