Thanks for confirming that. Now to the second part. I have reconfigured using a relay, see below (the LED and resistor represents the external device that I will be switching).
The challenge that I am having is that the relay closes for a brief second when the circuit is powered up which means the door will open after a power failure. I have checked and the relay is configured to be normally open.
Once up and running everything works as it should. It is possible to prevent the brief trigger when switching on?
/*
ESP8266 Web server with Web Socket to control an LED.
References:
https://github.com/Links2004/arduinoWebSockets
https://gist.github.com/bbx10/667e3d4f5f2c0831d00b
This has been modified to suit the relay's normally open configuration
When the button is pressed, the LED comes on for half a second
*/
#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>
#include <WebSocketsServer.h>
#include <Hash.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
static const char ssid[] = "xxx";
static const char password[] = "vvv";
MDNSResponder mdns;
static void writeLED(bool);
ESP8266WiFiMulti WiFiMulti;
ESP8266WebServer server(80);
WebSocketsServer webSocket = WebSocketsServer(81);
static const char PROGMEM INDEX_HTML[] = R"rawliteral(
<!DOCTYPE html>
<html>
<head>
<meta name = "viewport" content = "width = device-width, initial-scale = 1.0, maximum-scale = 1.0, user-scalable=0">
<title>ESP8266 WebSocket Demo</title>
<style>
"body { background-color: #808080; font-family: Arial, Helvetica, Sans-Serif; Color: #000000; }"
</style>
<script>
var websock;
function start() {
websock = new WebSocket('ws://' + window.location.hostname + ':81/');
websock.onopen = function(evt) { console.log('websock open'); };
websock.onclose = function(evt) { console.log('websock close'); };
websock.onerror = function(evt) { console.log(evt); };
websock.onmessage = function(evt) {
console.log(evt);
var e = document.getElementById('ledstatus');
if (evt.data === 'ledon') {
e.style.color = 'black';
}
else if (evt.data === 'ledoff') {
e.style.color = 'black';
}
else {
console.log('unknown event');
}
};
}
function buttonclick(e) {
websock.send(e.id);
}
</script>
</head>
<body onload="javascript:start();">
<!-- <h1>ESP8266 WebSocket Demo</h1> -->
<button id="ledon" type="button" onclick="buttonclick(this);">Open/Close</button>
<!-- <button id="ledoff" type="button" onclick="buttonclick(this);">Off</button> -->
</body>
</html>
)rawliteral";
// GPIO#0 is for Adafruit ESP8266 HUZZAH board. Your board LED might be on 13.
const int LEDPIN = 0;
// Current LED status
bool LEDStatus;
// Commands sent through Web Socket
const char LEDON[] = "ledon";
const char LEDOFF[] = "ledoff";
void webSocketEvent(uint8_t num, WStype_t type, uint8_t * payload, size_t length)
{
Serial.printf("webSocketEvent(%d, %d, ...)\r\n", num, type);
switch(type) {
case WStype_DISCONNECTED:
Serial.printf("[%u] Disconnected!\r\n", num);
break;
case WStype_CONNECTED:
{
IPAddress ip = webSocket.remoteIP(num);
Serial.printf("[%u] Connected from %d.%d.%d.%d url: %s\r\n", num, ip[0], ip[1], ip[2], ip[3], payload);
// Send the current LED status
if (LEDStatus) {
webSocket.sendTXT(num, LEDON, strlen(LEDON));
}
else {
webSocket.sendTXT(num, LEDOFF, strlen(LEDOFF));
}
}
break;
case WStype_TEXT:
Serial.printf("[%u] get Text: %s\r\n", num, payload);
if (strcmp(LEDON, (const char *)payload) == 0) {
writeLED(true);
}
else if (strcmp(LEDOFF, (const char *)payload) == 0) {
writeLED(false);
}
else {
Serial.println("Unknown command");
}
// send data to all connected clients
webSocket.broadcastTXT(payload, length);
break;
case WStype_BIN:
Serial.printf("[%u] get binary length: %u\r\n", num, length);
hexdump(payload, length);
// echo data back to browser
webSocket.sendBIN(num, payload, length);
break;
default:
Serial.printf("Invalid WStype [%d]\r\n", type);
break;
}
}
void handleRoot()
{
server.send_P(200, "text/html", INDEX_HTML);
}
void handleNotFound()
{
String message = "File Not Found\n\n";
message += "URI: ";
message += server.uri();
message += "\nMethod: ";
message += (server.method() == HTTP_GET)?"GET":"POST";
message += "\nArguments: ";
message += server.args();
message += "\n";
for (uint8_t i=0; i<server.args(); i++){
message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
}
server.send(404, "text/plain", message);
}
static void writeLED(bool LEDon)
{
LEDStatus = LEDon;
// Note inverted logic for Adafruit HUZZAH board
if (LEDon) {
digitalWrite(LEDPIN, 0);
delay(500);
digitalWrite(LEDPIN, 1);
LEDon = false;
}
else {
digitalWrite(LEDPIN, 0);
}
}
void setup()
{
pinMode(LEDPIN, OUTPUT);
digitalWrite(LEDPIN, 1);
writeLED(true);
Serial.begin(115200);
//Serial.setDebugOutput(true);
Serial.println();
Serial.println();
Serial.println();
for(uint8_t t = 4; t > 0; t--) {
Serial.printf("[SETUP] BOOT WAIT %d...\r\n", t);
Serial.flush();
delay(1000);
}
WiFiMulti.addAP(ssid, password);
while(WiFiMulti.run() != WL_CONNECTED) {
Serial.print(".");
delay(100);
}
Serial.println("");
Serial.print("Connected to ");
Serial.println(ssid);
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
if (mdns.begin("espWebSock", WiFi.localIP())) {
Serial.println("MDNS responder started");
mdns.addService("http", "tcp", 80);
mdns.addService("ws", "tcp", 81);
}
else {
Serial.println("MDNS.begin failed");
}
Serial.print("Connect to http://espWebSock.local or http://");
Serial.println(WiFi.localIP());
server.on("/", handleRoot);
server.onNotFound(handleNotFound);
server.begin();
webSocket.begin();
webSocket.onEvent(webSocketEvent);
}
void loop()
{
webSocket.loop();
server.handleClient();
}
