IoT power strip using ESP8266

Description

In this project, I'm using the ESP8266 module to control a power strip over the WiFi connection.
I'm using TRIAC with the MOC opto driver to control up to 12A.

The idea is to control the power strip using my smart phone over the internet.

The software on the module will be the nodeMCU with LUA scripts.

Details

#include <ESP8266WiFi.h>
#include <ESP8266mDNS.h>
#include <WiFiUdp.h>
#include <ArduinoOTA.h>
#include "hal.h"


//Inicializacao so servidor http na porta 80
WiFiServer server(80);
//Status da GPIO
uint8_t status_gpio = 0;

void setup() {

  initGPIO();


  Serial.begin(115200);
  Serial.println("Booting");

  //Inicia o WiFi para modo AP (Access Point)
  WiFi.mode(WIFI_AP);

  /* Configura o AP
  SSID
  senha
  canal (1-14)
  esconder rede (0-nao 1-sim)
  */
  //Configura o AP
  WiFi.softAP("IoTStrip","control42",2,0);

  //Logs na porta serial
  Serial.print("AP IP: ");
  Serial.println(WiFi.softAPIP());

  server.begin();

}

void webserver_handle(void){

  //Aguarda uma nova conexao
  WiFiClient client = server.available();
  if (!client) {
    return;
  }

  Serial.println("Nova conexao requisitada...");

  while(!client.available()){
    delay(1);
  }

  Serial.println("Nova conexao OK...");

  //Le a string enviada pelo cliente
  String req = client.readStringUntil('\r');
  //Mostra a string enviada
  Serial.println(req);
  //Limpa dados/buffer
  client.flush();

  //Trata a string do cliente em busca de comandos
  if (req.indexOf("rele_on") != -1){
    digitalWrite(LOAD, HIGH);
    digitalWrite(LED_A, HIGH);
    digitalWrite(LED_B, LOW);
    status_gpio = HIGH;
  } else if (req.indexOf("rele_off") != -1) {
    digitalWrite(LOAD, LOW);
    digitalWrite(LED_B, HIGH);
    digitalWrite(LED_A, LOW);
    status_gpio = LOW;
  }
  else {
    Serial.println("Requisicao invalida");
  }

  //Prepara a resposta para o cliente
  String buf = "";
  buf += "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n<!DOCTYPE HTML>\r\n";
  buf += "<html lang=\"en\"><head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1, user-scalable=no\"/>\r\n";
  buf += "<title>Regua IoT</title>";
  buf += "<style>.c{text-align: center;} div,input{padding:5px;font-size:1em;} input{width:80%;} body{text-align: center;font-family:verdana;} button{border:0;border-radius:0.3rem;background-color:#1fa3ec;color:#fff;line-height:2.4rem;font-size:1.2rem;width:100%;} .q{float: right;width: 64px;text-align: right;}</style>";
  buf += "</head>";
  buf += "<h3>Regua IoT</h3>";

  //De acordo com o status da GPIO envia o comando
  if(status_gpio)
    buf += "<div><h4>Regua: </h4><a href=\"?function=rele_off\"><button>Desligar</button></a></div>";
  else
    buf += "<div><h4>Regua: </h4><a href=\"?function=rele_on\"><button>Ligar</button></a></div>";

  buf += "<h4>Laboratorio Hacker de Campinas</h4>";
  buf += "</html>\n";

  //Envia a resposta para o cliente
  client.print(buf);
  client.flush();
  client.stop();
  Serial.println("Client disconectado!");
}

void loop() {
  webserver_handle();
}

Components

1 × ESP-03 Module ESP8266 Module

1 × MOC3041 Opto and Fiber Optic Semiconductors and ICs / Optocouplers and OptoisolatorsDriver

1 × BTA12 Discrete Semiconductors / Thyristors (DIACs, SIDACs, TRIACs, SCRs)

1 × 14K275 Varistor

Project Logs

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nodeMCU Lua code

Pedro Minatel • 07/28/2015 at 19:04 • 0 comments

srv=net.createServer(net.TCP)
pin=6
led_1=8
led_2=5
led_3=4
status=true
gpio.mode(pin,gpio.OUTPUT)
gpio.mode(led_1,gpio.OUTPUT)
gpio.mode(led_2,gpio.OUTPUT)
gpio.mode(led_3,gpio.OUTPUT)
gpio.write(pin,1)
gpio.write(led_1,0)
gpio.write(led_2,0)
gpio.write(led_3,1)
srv:listen(80,function(conn)
    conn:on("receive", function(client,request)
        local buf = "";
        local _, _, method, path, vars = string.find(request, "([A-Z]+) (.+)?(.+) HTTP");
        if(method == nil)then
            _, _, method, path = string.find(request, "([A-Z]+) (.+) HTTP");
        end
        local _GET = {}
        if (vars ~= nil)then
            for k, v in string.gmatch(vars, "(%w+)=(%w+)&*") do
                _GET[k] = v
            end
        end
        buf = buf.."<h1> ESP8266 IoT Power Strip Web Server</h1>";
        buf = buf.."<p>Lampada <a href=\"?pin=ON1\"><button>ON</button></a>&nbsp;<a href=\"?pin=OFF1\"><button>OFF</button></a></p>";
        buf = buf.."<br><br>";
        buf = buf.."<h2>Developed by Pedro Minatel</h2>";
        local _on,_off = "",""
        if(_GET.pin == "ON1")then
              gpio.write(pin,1)
              gpio.write(led_1,0)
              gpio.write(led_2,1)
              gpio.write(led_3,0)
              status = true
        elseif(_GET.pin == "OFF1")then
              gpio.write(pin,0)
              gpio.write(led_1,1)
              gpio.write(led_2,0)
              gpio.write(led_3,0)
              status = false
        elseif(_GET.pin == "TG1")then
              if(status == true)then
                    gpio.write(pin,0)
                    status = false
              else
                    gpio.write(pin,1)
                    status = true
              end
        end
        client:send(buf);
        client:close();
        collectgarbage();
    end)
end)

TRIAC Module

Pedro Minatel • 05/04/2015 at 21:52 • 1 comment

This is the TRIAC module with RC snubber for inductive load.

Should I keep the filter?

Testing the module

Pedro Minatel • 04/28/2015 at 23:01 • 0 comments

Right now I'm testing the nodeMCU TCP client script! The idea is to develop a basic Android app to control the power strip.

Discussions

Lauro Ilson wrote 10/28/2017 at 17:29

Olá Pedro,
Poderia me ajudar? Estou tentando incrementar o seu projeto, gostaria de adicionar ao projeto um push-bottom para que além de ligar a régua pela internet pudesse liga-la pelo botão físico acoplado a régua.

Are you sure? yes | no

Bruce Land wrote 04/29/2015 at 11:48

Good to hear!

Are you sure? yes | no

Bruce Land wrote 04/28/2015 at 12:14

It is a really bad idea to use a white board for 110 volt power. Use a blue box like in

http://people.ece.cornell.edu/land/courses/ece4760/FinalProjects/s2012/jdf226_ag537/index.html

Are you sure? yes | no

davedarko wrote 04/28/2015 at 21:33

Probably even worse for 230 volts :(

Are you sure? yes | no

Pedro Minatel wrote 04/28/2015 at 22:58

Hello Bruce, I know that is too risky! I was just testing the MOC plus the TRIAC. BTW the current was about 180mA and just for a few seconds.

The second prototype is a little bit more secure.

Are you sure? yes | no

IoT power strip using ESP8266

Description

Details

Components

Project Logs

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nodeMCU Lua code

TRIAC Module

Testing the module

Discussions

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