Make a people counter that detects the number of people who enter the room using lasers and LDRs and control it with an Android app.
Project tutorial by Kutluhan Aktar
Observe the magnetic field integrity and polarity in the air with the 3144E Hall effect sensor. Also, adjust the RGB LED colours easily.
The device will keep you safe. Just have to click a button and your precise location will be shared.
Project tutorial by Patel Darshil
Actually, it is just an HTTP request to the server basically. All other stuff is just for making it a better look.
I hope that it helps :
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