Instructables user MakerBee's alert system uses an Arduino microcontroller and a dual-axis accelerometer. When your washer and dryer stop vibrating, the machine will know and alert you accordingly.

When the power went out at his parents’ shop and ruined the contents of their fridge, [Lauters Mehdi] got to work building a custom power failure alert system to prevent future disasters. Alt… ...

The system is actually pretty simple. When the doorbell rings an Arduino sends a request to a notification service called PushingBox which then grabs a picture from web camera located outside.

Builders will also construct their own alert system using Arduino IDE pieces to read specific sensor data, then fire off an automated email if the readings stray outside a set field.

This option can be used to make a “missed call” alert, incase of an intrusion attempt. The circuit is highly-flexible so that you can use any SIM900A modem (and ofcourse any Arduino Uno board) of your ...