Hi
I am just about to implement a path of the dead mode. I'd like to control 3 LEDs which I put into the figures with an Arduino nano. Therefore I want to detect when a ball enters the Orthanc VUC to start the LED animation.
Here are my code Fragments:

int OrthancPin = 2;
attachInterrupt(digitalPinToInterrupt(OrthancPin), KugelDetektiert, RISING);

void KugelDetektiert(){
Kugel = true;
}

void loop() {
// Wait for ball in Orthanc VUC
while(Kugel == false){
delay(500);
}
...
Start LED animation
Kugel=false
}

I've connected the Opto Receiver Board 515-7308-00 (520-5232) Pin J1-A with Arduino: D2
So far so good, the ball is detected when entering the Orthanc VUC

BUT all the other Switches in row 1 (same switch row as the Orthanc VUC) trigger the KugelDetektiert() as well.

Anyone have any idea how to solve the issue on dedecting the column as well? I've tried:
Adding a second connection frim Receiver Board 515-7308-00 (520-5232) Pin J1-B to Arduino: D4
And enhancing the script:
int SwitchMatrixPin = 4;
int RowState;
void KugelDetektiert(){
RowState = digitalRead(SwitchMatrixPin);
if(RowState == HIGH){
TriggerZeit = millis();
}
}
But this did not work at all - Orthanc VUC is not working anymore - only a ball search releases the ball again.

Any hints are very welcome

Many thanks
Martin

SwitchMatrix (resized).png

SOLVED
The interrupt has to be attached to the column and inside the column the rowstate has to be read.
int MatrixColumn6Pin = 2;
int MatrixRow1Pin = 4;

attachInterrupt(digitalPinToInterrupt(MatrixColumn6Pin), InterruptRoutine, FALLING);

void InterruptRoutine(){

//Verzögerung der Abfrage, falls Arduino zu schnell sein sollte. Vermutlich nicht notwendig
//delayMicroseconds(1);

MatrixRow1Status = digitalRead(MatrixRow1Pin);
// Wenn Animation ohne Kugel ständig startet, auf LOW testen: if(MatrixRow1Status == LOW){
if(MatrixRow1Status == LOW){
Kugel = true;
#ifdef DEBUG
Serial.print("Kugel Boolean Wert In InterrupRoutine auf true gesetzt, Zeit:");
time();
Serial.print("\n");
#endif
TriggerZeit = millis();
}
}