upsexti

Documentation

Overview

Upsexti uses EXTI to detect changes in the button state. The LED should light up mmediately after pressing the button and go out 5 seconds after button release.

The algorithm presented in this example was originaly designed to control the UPS switch-over. It switches fast to the backup power source in the event of a mains failure and switch back when mains restores but with some dealy to avoid flapping.