Zero crossing detection in Simulink

Hi all. I would like to ask how in Simulink can be detected zero crossing signal. After each pass, I would like to actuate another signal transistor (1 then 2, then 3, etc.) Everything has to work in a loop. (1,2,3 1,2,3 1,2,3 etc)

Thank you for all the ideas Regards Pablo

Answer 1

[Greg Heath]

 if(a(i)*a(i+1)<0)

Hope this helps.

Greg

Answer 2

[Kaustubha Govind]

See the Hit Crossing block.