Want to sense air temperature? There’s a sensor for that. Particulate content in the air? There’s a sensor for that, too. Someone sneaking up on you? Get yourself some passive infrared sensors ...

This is a simple arduino project for a soil moisture sensor that will light up a LED at a certain moisture ... Measure the potentiomenter current value and replace it with a fixed resistor. I love all ...

All it requires is a moisture sensor ... something you wish your current electronics could do. Chances are, you can solve at ...