What You Need

This project requires only a few components. The total cost for all the parts should be under a hundred dollars. But since all the parts can be reused in other projects in this book and in future DIY efforts, it is a very reasonable investment consideration. To construct an Electric Guard Dog, you will need the following (see Figure 6, Electric Guard Dog parts):

Figure 6. Electric Guard Dog parts
  1. An Arduino Uno

  2. An Adafruit music and sound add-on pack for Arduino (includes wave shield, speaker, wire, and SD card)[29]

  3. A high-torque standard servo[30]

  4. A Passive InfraRed (PIR) motion sensor

  5. A 9-volt power supply to power the ...

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