By reading different values from the sensor, we can detect if is it light , dark or a value between them. Another element that we are going to use on this experiment is Piezo Buzzer. So what is it ?

In the microcontroller era today, Arduino is more than just a tool ... is used to measure the light level. The alarm system is triggered when a “Logic High (H)” level signal is detected at its sensor ...

It's just a buzzer at this point, but it'd be easy enough to add in an internet connection so you could get an alert of text or email. You'll need an Arduino along with a bunch of various sensors ...

Once you get the alarm set up, it’ll sense movement near the Arduino, snap a picture, then send it over to you using If This Then That. All you’ll need is an Arduino Yún, PIR sensor ...

As the soil dries out, the sensor value rises; when it reaches 900, the LED will light and the buzzer will sound. The sketch first defines Arduino pin A0 so that it reads the moisture sensor value. It ...