How to use an H11AA1 optocoupler to make a missing half sine wave mains detector

[newbee]

Hi all,
I have no knowledge in electronics.
In my project I'm driving multiple stepper motors controlled by an Arduino.
I need to stop the steppers and write their position to EEPROM in case of power shortage.
I was told to try an H11AA1 but I'm lost !
The other idea is to use an UPS with a TTL signal. But I don't know how to choose one.
Any suggestions pls ?

 

[danadak]

Using an opto coupler as a zero cross detector, stated another way when
zero cross no longer occurs of line there is a power outage. Use that as
an interrupt to signal line loss.

How can an optocoupler detect the zero cross point in an AC wave?

I am having some trouble using Triacs in order to dim a light bulb operating at 220V AC, I am a student at school and I don't have any background about using Triacs or Diacs or so, so I seeked the

electronics.stackexchange.com

A board used for eval, eg. a reference circuit to look at :

https://fscdn.rohm.com/en/products/databook/applinote/ic/power/ac-voltage-zero-cross-detection-ics/bm1z002fj_evk_002_ug-e.pdf

Circuit here : https://forum.allaboutcircuits.com/...ng-optocoupler-as-zero-cross-detector.145157/


Regards, Dana.

 

[newbee]

Thank you Dana. Let me see if I can understand your suggestions and get back to you.