I am wanting to monitor the voltage output of a full wave bridge rectifier and determine when the RMS voltage drops below a certain value. I don't want to filter the "humps" because I want to know almost instantly when the voltage drops and stays low for a certain period of time. I don't have any code yet as I am still just thinking about how it can be done. Does anyone have any ideas or point me toward a thread that has covered this?

Thanks, Don