Here's a prototype for the a laundry room sensor. It uses these sensors:

• Sound Sensor determines when washer or dryer cycle starts and completes
• PIR Presence Sensor used to determine when a completed load is picked up
• Water Detection circuit senses if there is a water leak or overflow, or a flood in the basement.
• light sensor circuit from the Uber sensor is used to determine if the laundry room light is left on.
• Temperature/Humidity sensor - because it's so cheap to add another sensor

The idea is to move the notification that a wash/dry cycle is complete - move it from the basement to the living room or kitchen, where you're more likely to make use of that signal anyways. It also keeps track of whether the wash has been picked up.

This is the interface for the sensor on the smart phone/tablet:

Video demo:

For all the code and configuration files, visit the Build Instructions link on the left bar.