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Introduction to Node MCU
The document provides an overview of NodeMCU, an open-source development environment based on the ESP8266 microcontroller, enabling low-cost, Wi-Fi capable projects. It includes programming instructions using C or Lua, along with practical activities for interfacing with LEDs and serial communication. Additionally, it emphasizes the importance of platform-based development and outlines learning outcomes for participants.
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Introduction to Node MCU
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- 4.We will nowhave connectivity for anything. Fromany time, any place connectivity for anyone!!!5
- 5.Various Names, OneConceptFor over a decade after the introduction of the termInternet-of-Things,different organizations andworking groups have been providing variousdefinitions.• M2M (Machine to Machine)• “Internet of Everything” (Cisco Systems)• “World Size Web” (Bruce Schneier)• “Skynet” (Terminator movie)• Cloud of Things• Web of Things6
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- 7.What is NodeMCU?The NodeMCU (Node MicroController Unit) is an opensource software and hardware development environmentthat is built around a very inexpensive System-on-a-Chip(SoC) called the ESP8266. An Arduino-like device Main component: ESP8266 Withprogrammable pins And built-inwifi Power via USB Low cost8
- 8.What you cando with it? Program it via C or LUA Access it via wifi (ex. HTTP) Connect pins to any device(in or out)9
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- 11.ESP8266 Block DiagramFigure: ESP8266EX Block Diagram12
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- 13.Download and installthe Arduino Software14
- 14.Programming an Arduino•The Arduino softwareconsists of a developmentenvironment (IDE) and thecore libraries.• The IDE is written in Javaand based onthe processing environment.• The core libraries arewritten in C and C++ andcompiled using avr-gcccompiler.15
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- 16.Program StructureSetup( ){//A function that runs once at the start of a program and is used toset //pinMode or initialize serial communication}loop( ){// This function includes the code to be executed continuously – readinginputs, //triggering outputs, etc.// This function is the core of all Arduino programs and does the bulk ofthe //work.}17
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- 18.Nodemcu assembling onBreadboard19
- 19.LED (Light emittingdiode)20
- 20.Activity 1.1Type :Team of 2 Duration : 20 MinutesSingle LED blink program using web.Anode of LED Cathode ofLED21
- 21.#include <ESP8266WiFi.h>#include <WiFiClient.h>constchar* ssid = "XXXX"; //Mention SSIDconst char* password = "XXXX"; //Mention passwordint ledPin = 5; //pin D1 of nodemcuWiFiServer server(80);void setup() {Serial.begin(115200);delay(10);22
- 22.pinMode(ledPin, OUTPUT);digitalWrite(ledPin, LOW);//Connect to WiFi networkSerial.println();Serial.println();WiFi.mode(WIFI_AP);/* You can remove the password parameter if youwant the AP to be open. */Serial.print("Connecting to ");Serial.println(ssid);23
- 23.WiFi.begin(ssid, password);while (WiFi.status()!= WL_CONNECTED) {delay(500);Serial.print(".");}Serial.println("");Serial.println("WiFi connected");// Start the serverserver.begin();Serial.println("Server started");24
- 24.// Print theIP addressSerial.print("Use this URL to connect: ");Serial.print("http://");Serial.print(WiFi.localIP());Serial.println("/");}25
- 25.void loop(){// Checkif a client has connectedWiFiClient client = server.available();if (!client){return;}// Wait until the client sends some dataSerial.println("new client");while (!client.available()){delay(1);}26
- 26.// Read thefirst line of the requestString request = client.readStringUntil('r');Serial.println(request);client.flush();// Match the requestint value = LOW;if (request.indexOf("/LED=ON") != -1) {digitalWrite(ledPin, HIGH);value = HIGH;}if (request.indexOf("/LED=OFF") != -1) {digitalWrite(ledPin, LOW);value = LOW;}27
- 27.// Return theresponseclient.println("HTTP/1.1 200 OK");client.println("Content-Type: text/html");client.println(""); // do not forget this oneclient.println("<!DOCTYPE HTML>");client.println("<html>");client.print("Led pin is now: ");if (value == HIGH) {client.print("On");} else {client.print("Off");}client.println("<br><br>");client.println("<a href="/LED=ON""><button>Turn On </button></a>");client.println("<a href="/LED=OFF""><button>Turn Off </button></a><br/>");client.println("</html>");28
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- 30.Activity 1.2Type :Team of 2 Duration : 20 MinutesTwo LEDs blink program using web31
- 31.#include <ESP8266WiFi.h>#include <WiFiClient.h>constchar* ssid = "xxxx"; //Mention SSIDconst char* password = "xxxx"; //Mention passwordint ledPin = 5; //pin D2 of nodemcuint ledPin1 = 4; //pin D1 of nodemcuWiFiServer server(80);void setup() {Serial.begin(115200);delay(10);pinMode(ledPin1, OUTPUT);pinMode(ledPin, OUTPUT);digitalWrite(ledPin, LOW);32
- 32.// Connect toWiFi networkSerial.println();Serial.println();WiFi.mode(WIFI_AP);/* You can remove the password parameter if you want the AP to be open. */Serial.print("Connecting to ");Serial.println(ssid);WiFi.begin(ssid, password);while (WiFi.status() != WL_CONNECTED) {delay(500);Serial.print(".");}Serial.println("");Serial.println("WiFi connected");// Start the serverserver.begin();Serial.println("Server started");33
- 33.// Print theIP addressSerial.print("Use this URL to connect: ");Serial.print("http://");Serial.print(WiFi.localIP());Serial.println("/");}void loop(){// Check if a client has connectedWiFiClient client = server.available();34
- 34.if (!client){return;}// Waituntil the client sends some dataSerial.println("new client");while (!client.available()){delay(1);}// Read the first line of the requestString request = client.readStringUntil('r');Serial.println(request);client.flush();35
- 35.// Match therequestint value = LOW;if (request.indexOf("/LED=ON") != -1) {digitalWrite(ledPin, HIGH);value = HIGH;}if (request.indexOf("/LED=OFF") != -1) {digitalWrite(ledPin, LOW);value = LOW;}if (request.indexOf("/LED1=ON") != -1) {digitalWrite(ledPin1, HIGH);value = HIGH;}if (request.indexOf("/LED1=OFF") != -1) {digitalWrite(ledPin1, LOW);value = LOW;}36
- 36.// Return theresponseclient.println("HTTP/1.1 200 OK");client.println("Content-Type: text/html");client.println(""); // do not forget this oneclient.println("<!DOCTYPE HTML>");client.println("<html>");client.print("Led pin is now: ");if (value == HIGH) {client.print("On");} else {client.print("Off");}37
- 37.client.println("<br><br>");client.println("<a href="/LED=ON""><button>Turn On</button></a>");client.println("<ahref="/LED=OFF""><button>Turn Off</button></a><br />");client.println("<br><br>");client.println("<a href="/LED1=ON""><button>Turn On1</button></a>");client.println("<a href="/LED1=OFF""><button>Turn Off1</button></a><br />");client.println("</html>");delay(1);Serial.println("Client disonnected");Serial.println("");}38
- 38.Serial communicationWhat isserial communication ?39
- 39.The word serialmeans "one after the other." What is Baud rate ?Number of symbols transferred per sec40
- 40.Serial Display FunctionsSerial.begin(baud_rate)//baud rate(characters per sec) between computer andboard is typically 9600 although you can work withother speeds by changing settings of COM Port Serial.print(value),//value could be any data and even string Serial.println(value)//print in new line41
- 41.Eg. Print INDIAon serial monitorvoid setup( ){Serial.begin(9600);// 9600 is default baud rate of serial comport of a computer}void loop( ){Serial.println(“INDIA”); // Send the value “INDIA”}42
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- 43.Activity 1.3Type :Team of 2 Duration : 20 MinutesWi-Fi Network Scanning by NodeMCU44
- 44.#include <ESP8266WiFi.h>void setup(){Serial.begin(115200);// Set WiFi to station modeWiFi.mode(WIFI_STA);WiFi.disconnect();delay(100);Serial.println("Setup done");}void loop(){Serial.println("scan start");int n = WiFi.scanNetworks(); // WiFi.scanNetworks willreturn the number of networksfoundSerial.println("scan done");45
- 45.if (n ==0)Serial.println("no networks found");else{Serial.print(n);Serial.println(" networks found");for (int i = 0; i < n; ++i){// Print SSID and RSSI for each network foundSerial.print(i + 1);Serial.print(": ");Serial.print(WiFi.SSID(i));Serial.print(" (");Serial.print(WiFi.RSSI(i));Serial.print(")");Serial.println((WiFi.encryptionType(i) == ENC_TYPE_NONE) ? " " :"*");delay(10);}46
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- 47.Learning OutcomesAt theend of the workshop the student should be able to1. Explain the importance of platform based development2. Understand The importance of NodeMCU and demonstrateits interfacing with various devices and sensors.48
- 48.For more informationcontact:amarjeetsinght@gmail.comlinkedin.com/in/amarjeetsingh-thakur-5491595549
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