Based on the previous door bell example, this sounds an alarm in one laptop when an electrical connection is made on another. Open a Turtle Art session for sharing on one laptop
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[[File:Image clipping neighbohood.png |100px]]
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and join that session on another laptop
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[[File:Mesh.png |75px]]
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The turtle's position is used to transmit the measured resistance to the second laptop.
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[[File:Image clipping bellsend.png|200px]]
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<i>sending laptop</i>
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In this case, the sending laptop is called 'tony'. To select its turtle, by its name, 'tony', plug a text block into the 'turtle' block rather than the normal number block. Load the Python block with the sine wave sample code [[File:Pythoncodeblock.jpg|50px]] and it sounds a 1 kHz tone when the received value is less than 3000.
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[[File:Image clipping bellreceive.png|200px]]
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<i>receiving laptop</i>
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It could be used to sound a remote alarm on a tank level etc.