Bark 1.0 Security System
Arpan Mondal built a radar-based device to scare off would-be intruders with barking sounds.
While you’re (hopefully) not in the business of breaking into houses or other establishments, you can certainly understand a person doing so would very much want to avoid dealing with dogs. Arpan Mondal had the idea to simulate a barking dog noises to scare off would-be intruders and created the Bark 1.0 security system.
It’s a fairly simple concept, and any Arduino or Arduino-like board should work for control (he used an ESP8266 per size considerations), but what makes his rig interesting is its radar-based RCWL-0516 triggering device.
This sensor is available for a couple of dollars, and acts in a similar manner to common PIR devices. Using radar instead of IR sensing, it’s able to detect humans on the other side of a wooden door within about a meter. This allows for easy installation as it's mounted on the inside of a door with no external parts needed.
With that bit of interesting kit selected, other components include an “Arduino” of your choosing, an audio amplifier and speaker, and a microSD card reader. A microSD card is then loaded up with the properly formatted dog sound (or other clip) to be played, and the system is mounted on a door to sense visitors.
A cardboard box is now used as the device’s housing, but future plans include modeling a 3D-printable box for it in Fusion 360. Other ideas entail an IoT feature where it doesn’t bark at Mondal when he returns per the location of his phone, and it could also be configured to send a notification when it does sense someone.
