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.

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.

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 ...