How to make a Ghost Knocker

Step 1: Check the materials you need. Below is the list of stuff you need to make it: 1. Arduino I used an Arduino Pro Mini 3.3V. You also need USB-Serial tether to program it. 2. A battery box I used a AA x 4 battery box with power line wires. 3. Breadborad I used a mini breadboard by Sparkfun. 4. ECM (Electet Microphone) Module I used an ECM module by Sparkfun. 5. RC Servo motor I used a mini servo motor ...

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