Arduino Automated Security Guard

In this Instructable, I will show you how to make an Arduino automated security guard. Please vote for this Instructable in the "Automation Contest" 2021. Thanks!

1. Arduino Uno (generic)

2. PIR Sensor

3. Speaker

4. TIP 120 transistor

3D print the files with supports and with the lid upside down

Here is the wiring diagram. The round black thing with the gold dot in the middle is the speaker and the green thing with the white circle is the sensor.

Make sure your board and port are selected correctly and upload the code.

Make sure that the 3d prints were successful and fit with the components. You may have to sand down the inside of the whole for the sensor to fit in.

Solder everything in the wiring diagram to the proper things. Then either use heat shrink, or wrap electrical tape around all the exposed wire as to not create any shorts. And yes I know it looks like a rats nest but it won't once I cram it all in the box.

I ended up using hot glue to put it all in the box because I didn't have any screws laying around that were small enough but if you do that works too. I recommend gluing the components down in this order. Arduino then transistor. Then glue the sensor and speaker to the lid and then glue the lid on. Make sure you don't break any of the wires while you are cramming the lid on.

Congrats! You now have a working Arduino automated security guard. In order to calibrate the sensor, you have to have no motion in front of the sensor for twenty seconds after you plug it in. After that twenty seconds, test it out. the box makes the speaker really loud because the sound reverberates through it kind of like a guitar. If you liked this instructable please vote for it in the "Automation Contest" 2021. Thanks!