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Components

	NodeMCU-8266 Ai-Thinker	x 1
	servomotor	x 1
	power source 5vDC	x 1
	jumpers wire	x 1

Tools, APP Software Used etc.

	MIT App Inventor MIT
	arduino IDE Arduino

Description

Node MCU based Wi Fi Servo Switch- DIY

About:

Regulations usually forbide to introduce pieces of equipment in the conecctions and wiring of the houses; this is in order to avoid undesirable fire's source, so I believe in this way I can use an IOT without tresppasing any rule.

This quick project consist in to use a MG995 servo connected to a nodemcu with Wifi Modules esp8266mod, and with a HMI from an App.

The servo push on and off the switch button, connceted to a 5VDC. You do not need any wiring at 120V or 220V AC levels

You can add all the modules you need making difference in the ip address of your home wifi network connection.

App can be downloaded from my app inventor site on this link:

https://gallery.appinventor.mit.edu/?galleryid=f40acb1c-4a83-44f7-b9f5-833f31e646d6

Esp8266 modules working as AP, and run on your wifi network. The commandsare not reachable from other places, receive data from pushbutton and voice recognition.

Code

Arduino prorgram to upload on nodemcu

C/C++

#include <GDBStub.h>
#include <WiFiClient.h>
#include <WiFiServer.h>
#include <Servo.h>

Servo servo;
/*
 *  This sketch demonstrates how to set up a simple HTTP-like server.
 *  The server will set a GPIO pin depending on the request
 *    http://server_ip/gpi2/0 will set the GPIO2 low,
 *    http://server_ip/gpi2/1 will set the GPIO2 high
 *  server_ip is the IP address of the ESP8266 module, will be 
 *  printed to Serial when the module is connected.
 */

// Updated: APRIL-30-2023 - to be used with SEERVO+ APP Inventor 2


#include <ESP8266WiFi.h>

const char* ssid = "here you wifi name";
const char* password = "here you wifi pwd";

// Create an instance of the server
// specify the port to listen on as an argument
WiFiServer server(80);

void setup() {
  Serial.begin(115200);
  delay(10);

servo.attach(2); // nodemcu D4 pin
  servo.write(58); // move to 0•
  delay(15);
servo.write(0); // move to 0•
  delay(15);
  
  // 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.println(WiFi.localIP());
   
}

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 req = client.readStringUntil('\r');
  Serial.println(req);
  client.flush();
  
  // Match the request
  int val1;
 
 if (req.indexOf("/gpio2/0") != -1)
    {val1 = 0;
    //digitalWrite(0, val1); // Set GPIO2 according to the request
  servo.write(val1); // move servo to 0•
  delay(150);
  Serial.println(val1);

  // Prepare the response
  String s = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n<!DOCTYPE HTML>\r\n<html>\r GREEN SERVO on GPIO2 is now ";
  s += (val1)?"high":"low";
 
  
 
  // Send the response to the client
  client.print(s);
  delay(300);
  client.flush();
  Serial.println("Client disconnected");

  // The client will actually be disconnected 
  // when the function returns and 'client' object is detroyed

    
    }
 if (req.indexOf("/gpio2/1") != -1)
    {val1 = 58;
    
   servo.write(val1);// move servo to 58•
   delay(150);
   Serial.println(val1);
 // Prepare the response
  String s = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n<!DOCTYPE HTML>\r\n<html>\r\n GREEN SERVO on GPIO2 is now ";
  s += (val1)?"high":"low";
  
 
  // Send the response to the client
  client.print(s);
  delay(300);
   client.flush();
  Serial.println("Client disconnected");

  // The client will actually be disconnected 
  // when the function returns and 'client' object is detroyed
    
   }
 
  else {
    Serial.println("invalid request");
    client.stop();
    return;
    
  }
}

May 04,2023

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