Initial Prototype Sketch

The BathPal will be added to the bathtub and it will have a sensor to determine how full the bathtub is. The color of the light will communicate to the user in another room how full the bathtub is. The sensor will also be connected to the user's smart-phone, where a sound will alert you based on how full the bathtub is. 

The idea is to give the parents peace of mind while unlocking some time for the parent to do some other productive tasks.