Building an IoT Project with Arduino

Introduction: The Internet of Things (IoT) has revolutionized the way we interact with our surroundings. It enables us to connect and control various devices remotely, making our lives more convenient and efficient. In this article, we will explore the importance and usefulness of IoT and provide a step-by-step guide to creating an IoT project using Arduino.

Project: For our example project, we will create a smart home automation system that allows users to control their lights and monitor the temperature using a smartphone app. The objectives of this project are to provide convenience, energy efficiency, and remote monitoring capabilities.

Components List: To build this project, you will need the following components:

1. Arduino Uno - 1x (https://store.arduino.cc/arduino-uno-rev3)
2. Ethernet Shield - 1x (https://store.arduino.cc/arduino-ethernet-shield-2)
3. Relay Module - 1x (https://www.sparkfun.com/products/13815)
4. DHT11 Temperature and Humidity Sensor - 1x (https://www.adafruit.com/product/386)
5. Jumper Wires - as required (https://www.sparkfun.com/products/11026)
6. Breadboard - 1x (https://www.sparkfun.com/products/12002)
7. LED Bulb - 1x (https://www.sparkfun.com/products/13279)
8. Smartphone with internet connectivity

Examples: Here are the code snippets for our IoT project:

1. Setting up Ethernet Connection:

   
   #include <SPI.h>
   #include <Ethernet.h>

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; IPAddress ip(192, 168, 1, 177);

EthernetServer server(80);

void setup() { Ethernet.begin(mac, ip); server.begin(); }

This code initializes the Ethernet connection using a specific MAC address and IP address.

2. Control the LED Bulb:

include <Ethernet.h>

int relayPin = 2;

void setup() { pinMode(relayPin, OUTPUT); }

void loop() { if (Ethernet.available()) { char command = Ethernet.read(); if (command == '1') { digitalWrite(relayPin, HIGH); } else if (command == '0') { digitalWrite(relayPin, LOW); } } }

This code allows the user to control the LED bulb connected to the relay module. Sending '1' turns the bulb on, and '0' turns it off.

3. Temperature Monitoring:

include <Ethernet.h>

include <DHT.h>

define DHTPIN 3

define DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE);

void setup() { dht.begin(); }

void loop() { float temperature = dht.readTemperature(); float humidity = dht.readHumidity();

// Send temperature and humidity values to a remote server or display on the app }

This code uses the DHT11 sensor to measure temperature and humidity. The values can be sent to a remote server or displayed on the smartphone app.