I'm a college student living on campus. Most of the time I'm connected to my school's WiFi. However, sometimes I turn it off if it is running slow but forget to turn it back on. This is to minimize the amount of time I unintentionally have it off.
If
Disconnects from a specific WiFi network
This Trigger fires every time your Android device disconnects from a WiFi network you specify.
Then
Send a notification from the IFTTT app
This action will send a notification to your devices from the IFTTT app.
Discover more time saving integrations for Android Device and Notifications