Because his blinkenlight shield can be used as a light sensor, all that’s needed is a mirror and a pretty long line of sight. There’s a few problems with the setup though: with the Arduino ...

The setup is pretty simple as you might expect. A photocell and TMP36 temperature sensor are connected to the Arduino ... shows the temp and amount ambient light present in the room.

That makes it ideal for applications like robotics or controlling smart blinds that react to light ... the Arduino to another device, such as a speaker, will allow you to set up a chime that ...