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There's an article on the Raspberry Pi site (https://www.raspberrypi.org/forums/viewtopic.php?f=30&t=20149) that talks about how to make the Pi automatically reboot if the internet connection is lost. I haven't tried it myself, so I can't vouch for it but it might be worth looking into.
The only suggestion I have is to recheck the wiring between the Pi and your PIR sensor and make sure it's connect as described in step 15.
Sorry for the delay in responding, with respect to the PI 3, it should work with the built in wireless without any changes to the instructions in this instructable. You could do this with a laser trip wire: you'd need a circuit that would act like a switch and then connect the two wires from that switch to GPIO 23 and GND like the PIR sensor and it should work. You might need to change line 155 of rpi-ms-camera.py from GPIO_RISING to GPIO.FALLING. I did some searching and there's a circuit at http://www.edaboard.com/thread205002.html that might work for you: you'd have to connect GPIO 23 and GND to the relay connections on the right side of circuit diagram.
What happens when you use --firsttime is that a program I reused from github that comes from (https://github.com/andreafabrizi/Dropbox-Uploader.git) runs and sets up dropbox on the Pi. I'm not familiar with all the details of how that works and how to undo what it does. My best recommendation, and I really hate to recommend this because it's a pain, would be to start from a new image Raspbian and do the install from the very beginning of step 9.
Sorry to hear you're having trouble getting this to work. Can you post a reply to this or send me a private message with a cut and paste of your /etc/network/interfaces file?
Glad to hear that you used the code with no problems! The project doesn't use a laser. The PIR sensor it uses detects motion by measuring changes in the infrared (heat) levels emitted by surrounding objects. The PIR sensor I used costs about $13.
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Hi Jorette. It's definitely possible. I'll do a little research and then reply with some instructions on how to do it.
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