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Making a doorbell  RSS feed

 
Greenhorn
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Hi.

Would you please help me rank the options, according to easiness and price, for doing the following using Java?

I need to receive input from a device.  I’m not sure what this device is called yet, but I know it can make a lot of other devices (such as public sinks, paper towel dispensers, and air hand dryers) touchless.  It can make them touchless because it knows when something (such as a hand) is waved in front of them.  Because I don’t know what this device is called, I’ll refer to it as the first device.  

I need the sound of my voice to be played when something is waved in front of the first device.  I also need the amount of time after something is waved in front of the first device to be kept track of.  Please call this amount of time “x”.  And, I need the sound of my voice to be played, with a changed volume, when something is waved again in front of the first device, AND when x is greater than one amount of time, AND when x is lesser than another amount of time.

In addition to a speaker that plays the sound of my voice, I also need another output device, a light (whose brightness I can change).  I need these two output devices to be far away from the first device.

Would changing the code of a musical doorbell be a good shortcut?

Thank you!

Jason
 
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