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I started with the installation of PIR sensor, which was easy. The hardest part is to install the message notification. I searched online and found the guide here : But it failed to work on my photon, and it turned out later that my Particle Dev had some errors. Finally problem solved after I changed to use I also find a similar project online that used PIR sensor (, and learned how he coded PIR and switch button, I also learned from I was struggling between using a LED as a sign or a text message, I finally choose using text messages because it is more mobile that people don't need to stay beside the LED. A challenge I met was that it kept sending messages to my phones when there is a detection, and the sensor is quite sensitive so my phone kept ringing. I later added "delay(600000)" to solve the problem.

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