Wierd problem with HC-SR04.

Hello,

Iam trying to use ultrasonic sensor HC-SR04 in Simulink, but it always shows 0 when i start simulation. Iam using Arduino Uno and when i tested the sensor in Arduino IDE it worked perfectly, even if i tried it in Matlab it worked. I am lost, do someone have any idea how to make it work? :)

Thanks for your answeres and have a nice day

[Héctor Arismendi]

I have the same problem, do you solve the problem?

[han wang]

I have the same problem with 2021B. Possiblily a bug?