First, let's see the required hardware components for this chapter.

We need an Arduino Uno board. To control the lamp remotely (the lamp was used as an example in the chapter, but of course any 110V or 230V device can be used here), you will also need a relay module. We used a 5V relay module from Polulu, but you can use any 5V relay module that you want.

To measure the instant power consumption of the device connected to the plug, you will also need a current sensor. For this part, we will choose a breakout board based on the ACS712 chip. The following is a picture of the board I used:

You will also need a board that includes the CC3000 Wi-Fi chip, which we will use to receive commands via the Android device. For this project, we will choose a CC3000 breakout board from Adafruit. Of course, you can also use a shield from the same brand for this project; the code will be exactly the same.

To make the different connections, you will also need a breadboard and...