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A laundry alarm for the hearing impaired and everyone else!

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Step 3: Building the master module

Picture of Building the master module

Building this module will depend on what Arduino 328 based MCU you want to use.  I chose the Ardweeny because it was cheap and small and I had two on hand.  I mounted components on a perf board from my junk box.  I used hobby servo interconnect cables between modules.  The Ardweeny requires a 5VDC supply, other Arduinos may not. See  schematic and photo for details.
 
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