Adding 433MHz RC to ESP8266-01

esp266-433Currently I have a homeautomation system on an Arduino. It uses 433 Mhz to switch lamps and stuff. It works fully automatic and if i want to intervene I use bluetooth to give commands.
It works well, but if I am away from home, I cannot intervene or check anything anymore. So I started to transfer the entire Arduino based system to an ESP8266.
Obviously that is a big overhaul and one of the first things I wanted to check is how well my 433 Mhz switches could be integrated with an ESP8266.
As such code might be beneficial to others, I thought I’d publish it here.
The 433 Mhz library I use is the enhanced RemoteSwitch library. I find that a bit more pleasant than the RCSwitch library because for many (not for all) remote switch sockets you do not need to sniff any code. Just knowing what type of Switch you have is enough.
The example below switches 4 sockets. I have explained the use of those switches with the RemoteSwitch library in another post. Obviously I switch many more in my house, but I wanted to keep things in this example simple. I am using an ESP8266-01, the simplest of the ESP8266 modules. I use GPIO2 to connect to the signal pin of a 433 MHz transmitter and feed everything with 3.3 Volt. As the ESP8266 is working on 3.3Volt, the transmitter is also working on 3.3Volt. I didnt notice any problem with that, but it is better to use a decent antenna that is easy to make, rather than just a 1/4 wavelength rod. Under no circumstance put 5 volt on any of your ESP8266 pins. If for whatever reason you need or want to feed the transmitter with a higher voltage, then I presume it is ok to still connect the GPIO2 pin to the data pin of the transmitter, as I presume that doesnt carry a voltage (but better do not risk it), but the transmitter may not recognize the ESP8266 output as HIGH. Adding a levelconverter may be necessary then, but to be clear: It works well with 3.3 Volt for the transmitter
The Sketch is quite straightforward. I included 4 switches as example. Therefore there are 8 buttons defined (ON and OFF for each channel.
If you want to add more switches, add the names for these in the Array. The program will automatically generate the required buttons. Add the On and Off codes for yr switch to code for the pages via a Switch /case statement.
When you start the program the relevant connection data is printed in the serialmonitor but the IP that you need can also be checked in the DHCPclient list of your router

    This Sketch demonstrates the use of the Extended RemoteSwitch Library  with an ESP8266-01 WiFi module
    The setup is as follows:
    Supply module with 3.3 Volt
    Attach  pin GPIO2 with the signal pin of a 433 Mhz transmitter module
    The names you want to attach to the Buttons are defined in  the array "socketnames"
    the number of sockets can be extended. Pages are dynamically generated based on the
    size of the array as calculated by "ARRAY_SIZE"
    The use of  4 different modules is demonstrated:
    ELRO AB440
    Blokker /SelectRemote 1728029
    EverFlourish EMW203
    Eurodomest 972080
    Basic idea from Alexbloggt
    23-09-2016 DIY_bloke
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include <RemoteSwitch.h> //FuzzyLogic extended lib

            Object Declarations
ElroAb440Switch ab440Switch(2);
BlokkerSwitch3 blokkerTransmitter(2);// SelectRemote 1728029
EverFlourishSwitch everswitch(2);  // EverFlourish EMW203
Ener002Switch enerswitch(2);      // Eurodomest 972080
//  Fill out the base address of YOUR Eurodomest switch
const unsigned long euro  = 823149;  // base adres eurodomest  : 11001000111101101101  Supply the baseaddress of YOUR Eurodomest
#define ElroAAN ab440Switch.sendSignal(29, 'A', true)
#define ElroUIT ab440Switch.sendSignal(29, 'A', false)
#define BlokkerAAN blokkerTransmitter.sendSignal(1, true)
#define BlokkerUIT blokkerTransmitter.sendSignal(1, false)
#define EverFlourishAAN everswitch.sendSignal('A', 1, true)
#define EverFlourishUIT everswitch.sendSignal('A', 1, false)
#define EnerAAN enerswitch.sendSignal(euro, 1, true)
#define EnerUIT enerswitch.sendSignal(euro, 1, false)
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
MDNSResponder mdns;
// Replace with your network credentials
const char* ssid = "YourSSID";
const char* password = "YourPassword";
ESP8266WebServer server(80);
// Define names of your buttons here, number of buttons will be  automatically adapted
char* socketnames[] = {"ELROAB440", "Blokker", "EverFlourish", "ActionSwitch"};
int numofsockets = ARRAY_SIZE (socketnames);//bevat de grootte van het Array
// sample css and html code
String css = "body {background-color:#ffffff; color: #000000; font-family: 'Century Gothic', CenturyGothic, AppleGothic, sans-serif;}h1 {font-size: 2em;}";
String head1 = "<!DOCTYPE html> <html> <head> <title>RemoteSwitch Demo</title> <style>";
String head2 = "</style></head><body><center>";
String header = head1 + css + head2;
String body = "";
String website(String h, String b) {
  String complete = h + b;
  return complete;
void setup(void) {
  // adapt body part of html if necessary
  body = "<h1>RemoteSwitch Demo</h1>";
  // socket names and buttons are created dynamical
  for (int i = 0; i < numofsockets; i++) {
    String namesocket = socketnames[i];
    body = body + "<p>" + namesocket + " <a href=\"socket" + String(i) + "On\"><button>ON</button></a> <a href=\"socket" + String(i) + "Off\"><button>OFF</button></a></p>";
  body += "</center></body>";
  WiFi.begin(ssid, password);
  // Wait for connection
  while (WiFi.status() != WL_CONNECTED) {
  // serial output of connection details
  Serial.print("Connected to ");
  Serial.print("IP address: ");
  if (mdns.begin("esp8266", WiFi.localIP())) {
    Serial.println("MDNS responder started");
  // this page is loaded when accessing the root of esp8266´s IP
  server.on("/", []() {
    String webPage = website(header, body);
    server.send(200, "text/html", webPage);

                        Dynamically creating pages
   *********************************************** */
  for (int i = 0; i < numofsockets; i++) {
    String pathOn = "/socket" + String(i) + "On";
    const char* pathOnChar = pathOn.c_str();
    String pathOff = "/socket" + String(i) + "Off";
    const char* pathOffChar = pathOff.c_str();
    //content ON page
    server.on(pathOnChar, [i]() {
      String webPage = website(header, body);
      server.send(200, "text/html", webPage);

      switch (i)
        case 0:
        case 1:
        case 2:
        case 3:

    //content OFF page
    server.on(pathOffChar, [i]() {
      String webPage = website(header, body);
      server.send(200, "text/html", webPage);

      switch (i)
        case 0:
        case 1:
        case 2:
        case 3:

  Serial.println("HTTP server started");
void loop(void) {

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