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Mounted on a door, this device senses knocking sounds and knocks back the same way. You can use it as a prank or a spooky effect. It is a simple circuit with an Arduino, an electret microphone module, and a servo motor. Check out what others are saying about the Ghost Knocker project build!
Please note: Due to inventory packaging methods, you may receive extra components for some products.
|2157765||ARDUINO PRO MINI|
|2159445||ANALOG SOUND SENSOR|