Double pulse after x amount of time (through time cascade)?

[Rodrigo Mendes]

So, im really lost, i tried building this double pulse with everything i can think but with not success. Basically i want a double pulse (1s or 0.5s between them using timers maybe?) after my time cascade (im aiming for 30 sec). So a double pulse after 30 seconds infinitely.

edit: so i finally got it, i'll post a gif and the wiring, is there any way to improve it or make it simpler? Here is a gif of me activating it