NodeMCU 0.9 Manual using Arduino IDE

NodeMCU 0.9 Manual
Using Arduino IDE

Introduction
NodeMCU is an open source IoT platform. It includes firmware which runs on
ESP8266 Wi-Fi SoC.
This manual explains each step to set up Arduino IDE for NodeMCU and make a
DEVKIT Version 0.9 of NodeMCU work with it. At the end of this manual, we shall
be able to program NodeMCU DEVKIT using Arduino IDE and control it from a
local area network (via WiFi).
NodeMCU Pin Mapping

Notes:
* The ESP8266 chip requires 3.3V power supply voltage. It should not be
powered with 5 volts like other Arduino boards.
* NodeMCU ESP-12E development board can be connected to 5V
using micro USB connector or Vin pin available on board.
* The I/O pins of ESP8266 communicate or input/output max 3.3V only.
The pins are NOT 5V tolerant inputs.

Getting Arduino IDE
Step 1: Go to https://www.arduino.cc/en/Main/Software
Step 2: Download the required package (according to your Operating System and
system requirements).
Note: Arduino IDE for Linux needs to be run either by “root” or any user with
privileged permission to allow USB access.
Setting up NodeMCU 0.9 board
Step 1: Open Arduino IDE
Step 2: Go to Files and open Preferences

Step 3: Paste the following URL in Additional Boards Manager URLs box. If there
are multiple URLs, separate them by comma.
http://arduino.esp8266.com/stable/package_esp8266com_index.json
Step 4: Click OK and close the preference dialog.
Step 5: Go to Tools and then under Board menu, click Board Manager

Step 6: Scroll down and navigate to “esp8266 by esp8266 community”. Click on
install and let the installation process complete.

Step 7: Once installed we’re ready to program our NodeMCU.
Glowing a LED
Step 1: Connect a LED to the NodeMCU DEVKIT as shown in the figure. The 13th
pin in Arduino IDE is mapped onto the D7 slot of NodeMCU.

Step 2: The following is the basic blink program for making the LED blink from
NodeMCU.
void setup() {
pinMode(13, OUTPUT);
}
void loop() {
// Let the LED glow for 2 seconds
digitalWrite(13, HIGH);
delay(2000);
// LED would be turned off for 3 seconds
digitalWrite(13, LOW);
delay(3000);
}
Step 3: Upload the program to the board (NodeMCU 0.9) through appropriate
port.
Controlling LED from a web browser
Step 1: Make a local WiFi hotspot using smartphone or wireless router.
Step 2: The following code glows LED from devices connected to that WiFi

#include <ESP8266WiFi.h>
const char* ssid = "Cygnus-a";
const char* password = "cygnus8019@star";
int ledPin = 13; // GPIO13
WiFiServer server(80);
void setup() {
Serial.begin(115200);
delay(10);
pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, LOW);
// Connect to WiFi network
Serial.println();
Serial.println();
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 server
server.begin();
Serial.println("Server started");
// Print the IP address
Serial.print("Use this URL to connect: ");
Serial.print("http://");
Serial.print(WiFi.localIP());
Serial.println("/");
}
void loop() {
// Check if a client has connected
WiFiClient client = server.available();
if (!client) {
return;
}
// Wait until the client sends some data

Serial.println("new client");
while(!client.available()){
delay(1);
}
// Read the first line of the request
String request = client.readStringUntil('r');
Serial.println(request);
client.flush();
// Match the request
int value = LOW;
if (request.indexOf("/LED=ON") != -1) {
digitalWrite(ledPin, HIGH);
value = HIGH;
}
if (request.indexOf("/LED=OFF") != -1) {
digitalWrite(ledPin, LOW);
value = LOW;
}
// Set ledPin according to the request
//digitalWrite(ledPin, value);

// Return the response
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println(""); // do not forget this one
client.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>");
delay(1);
Serial.println("Client disonnected");
Serial.println("");
}

Step 3: Open serial monitor and note down the URL assigned to NodeMCU by
DHCP server.
Step 4: Connect a computer or smartphone to the WiFi and open
http://192.168.0.101/LED=ON to turn LED on or http://192.168.0.101/LED=OFF to
turn LED off. The URL would be the URL shown by Node on serial monitor.
Controlling electrical devices from a web browser
Step 1: Make sure all devices that would be controlling electrical appliances are
connected to the same WiFi network.
Step 2: The following circuit connection has two relay switch modules attached
that can be controlled through the microcontroller.

Step 3: Upload the following code to the NodeMCU board.
#include <ESP8266WiFi.h>
const char* ssid = "Cygnus-a";
const char* password = "cygnus8019@star";
WiFiServer server(80);
void setup() {
Serial.begin(115200);
delay(10);
pinMode(5, OUTPUT);
pinMode(4, OUTPUT);
pinMode(0, OUTPUT);
pinMode(13, OUTPUT);
// Connect to WiFi network
Serial.println();

Serial.println();
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 server
server.begin();
Serial.println("Server started");
// Print the IP address
Serial.print("Use this URL to connect: ");
Serial.print("http://");
Serial.print(WiFi.localIP());
Serial.println("/");
}
void loop() {
// Check if a client has connected
WiFiClient client = server.available();
if (!client) {
return;
}
// Wait until the client sends some data
Serial.println("new client");
while(!client.available()){
delay(1);
}
// Read the first line of the request

String request = client.readStringUntil('r');
Serial.println(request);
client.flush();
// Match the request
if (request.indexOf("/light1on") > 0) {
}
if (request.indexOf("/light1off") >0) {
}
}
if (request.indexOf("/light2off") >0) {
}
if (request.indexOf("/light3on") >0) {
}
if (request.indexOf("/light3off") > 0) {
}
}
if (request.indexOf("/light4off") > 0) {

}
// Set ledPin according to the request
//digitalWrite(ledPin, value);
// Return the response
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println(""); // do not forget this one
client.println("<!DOCTYPE HTML>");
client.println("<html>");
client.println("<head>");
client.println("<meta name='apple-mobile-web-app-capable'
content='yes' />");
client.println("<meta name='apple-mobile-web-app-status-
bar-style' content='black-translucent' />");
client.println("</head>");
client.println("<body bgcolor = "#f7e6ec">");
client.println("<hr/><hr>");
client.println("<h4><center> Esp8266 Electrical Device
Control </center></h4>");
client.println("<hr/><hr>");
client.println("<center>");
client.println("Device 1");
client.println("<a href="/light1on""><button>Turn On
</button></a>");
client.println("<a href="/light1off""><button>Turn Off
client.println("</center>");
</button></a>");

</button></a>");
</button></a>");
client.println("<table border="5">");
client.println("<tr>");
if (digitalRead(5))
{
client.print("<td>Light 1 is ON</td>");
}
else
{
client.print("<td>Light 1 is OFF</td>");
}
client.println("<br />");
if (digitalRead(4))
{
}
else
{

}
client.println("</tr>");
client.println("<tr>");
if (digitalRead(0))
{
}
else
{
}
if (digitalRead(13))
{
}
else
{

}
client.println("</tr>");
client.println("</table>");
client.println("</html>");
delay(1);
Serial.println("Client disonnected");
Serial.println("");
}
Copy the above code and complete the process.

NodeMCU 0.9 Manual using Arduino IDE

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