Building Smart Homes with Raspberry Pi Zero

Configuring the smart plug

We are now going to configure the Raspberry Pi so it behaves like a smart plug. As usual, we'll use Node.js to code the software that will control our Raspberry Pi Zero board.

We start by importing all the required modules for the project:

var mcpadc = require('mcp-spi-adc');
var express = require('express');
var app = express();
var piREST = require('pi-arest')(app);

Note that we are using the mcp-spi-adc module here, which will allow us to easily read data from the MCP3008 chip.

Next, we define the channel to which the current sensor is connected:

var channel = 5;

We also set the value of the load resistance we are using for the sensor:

var resistance = 10;

This will allow us to calculate the actual current flowing through ...