What if you could get an instant SMS alert the moment a fire or smoke is detected at home or office? Through this project ...

[mircemk] shows how to create a simple non-contact proximity sensor using little more than an Arduino Nano board, and a convenient software library intended to measure the value of capacitors.

While newer Arduinos and Arduino compatibles ... and the current version give you the option of reprogramming the ’16u2 with custom sketches, and use seven I/O pins on this previously overlooked ...

It isn't entirely geared towards using sensors and modules. You may need to dig deeper or turn to third-party resources to ...