Controlling lights and measuring current consumption

Now in this section we will explain how to control and monitor your current consumption when the light is on or off. Using your Arduino Wi-Fi shield from a web page, we will monitor this variable. When the light is off it looks as follows:

When the light is on it looks as follows:

You can now either copy the code inside a file called Controlling_lights_Current_Consumption.ino, or just get the complete code from the folder of this book.

Define variables and functions to monitor and control:

#define NUMBER_VARIABLES 2 
#define NUMBER_FUNCTIONS 1 

Import libraries to use:

#include <Adafruit_CC3000.h> 
#include <SPI.h> 
#include <CC3000_MDNS.h> 
#include <aREST.h> 

Configure the relay to activate:

const int relay_pin = 8; 

Variables to calculate the current:

float amplitude_current; 
float effective_value; 
float effective_voltage = 110; 
float effective_power; 
float...