I follow this tutorial https://www.hackster.io/matrix-creator-team/rasberry-pi-universal-ir-remote-with-matrix-creator-221b7f and I manage to have the blinking led when I press some keys near the board, but when I try to use irrecord with the command:
irrecord -d /dev/lirc0 ~/SCREEN_PROJECTOR.conf then I get stuck at
It is very important that you press many different buttons and hold them down for approximately one second. Each button should generate at least one dot but in no case more than ten dots of output. Don't stop pressing buttons until two lines of dots (2x80) have been generated. Press RETURN now to start recording.
No dots appears but the blue led is blinking.
Any ideas on how debug or fix this please ?