Introduction: Home Automation With ESP8266 and 433 MHz Switches
Currently 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. (link dead. try here) 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 instructable. Obviously I switch many more in my house, but I wanted to keep things 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>";
delay(1000);
Serial.begin(115200);
WiFi.begin(ssid, password);
Serial.println("");
// Wait for connection
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
// serial output of connection details
Serial.println("");
Serial.print("Connected to ");
Serial.println(ssid);
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
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:
ElroAAN;
break;
case 1:
BlokkerAAN;
break;
case 2:
EverFlourishAAN;
break;
case 3:
EnerAAN;
break;
default:
break;
}
delay(500);
});
//content OFF page
server.on(pathOffChar, [i]() {
String webPage = website(header, body);
server.send(200, "text/html", webPage);
switch (i)
{
case 0:
ElroUIT;
break;
case 1:
BlokkerUIT;
break;
case 2:
EverFlourishUIT;
break;
case 3:
EnerUIT;
break;
default:
break;
}
delay(500);
});
}
server.begin();
Serial.println("HTTP server started");
}
void loop(void) {
server.handleClient();
}
