4 Relay ESP8266 IDE

6 years 3 months ago - 6 years 3 months ago #1867 by piman
4 Relay ESP8266 IDE was created by piman
Hi I'm trying to control 4 relay switches a bank of 4 with 1 ESP8266-07 , using EasyIoT example by adding more GPio ports in my sketch and then recall them with the automation help her but all it seems to do is control the first relay regardless.
 *  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/gpio/0 will set the GPIO2 low,
 *    http://server_ip/gpio/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.

#include <ESP8266WiFi.h>

const char* ssid = "xxx";
const char* password = "xxx";

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

void setup() {

  // prepare GPIO2
  pinMode(2, OUTPUT);
  digitalWrite(2, 0);
  // prepare GPIO3
  pinMode(3, OUTPUT);
  digitalWrite(3, 0);
  // Connect to WiFi network
  Serial.print("Connecting to ");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
  Serial.println("WiFi connected");
  // Start the server
  Serial.println("Server started");

  // Print the IP address

void loop() {
  // Check if a client has connected
  WiFiClient client = server.available();
  if (!client) {
  // Wait until the client sends some data
  Serial.println("new client");
  // Read the first line of the request
  String req = client.readStringUntil('\r');
  // Match the request
  int val;
  if (req.indexOf("/gpio/0") != -1)
    val = 0;
  else if (req.indexOf("/gpio/1") != -1)
    val = 1;
  else {
    Serial.println("invalid request");

  // Set GPIO2 according to the request
  digitalWrite(2, val);
  digitalWrite(3, val);

  // 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\nGPIO is now ";
  s += (val)?"high":"low";
  s += "</html>\n";

  // Send the response to the client
  Serial.println("Client disonnected");

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

Your help is appreciated thank you

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6 years 2 months ago #2028 by Yaron
Replied by Yaron on topic 4 Relay ESP8266 IDE
Hi There ,

By looking at the code , it seem like you are trying to activate BOTH digital output at once.

// Set GPIO2 according to the request
digitalWrite(2, val);
digitalWrite(3, val);
Not sure you can set them both to ON or OFF , try setting them in a Q.
digitalWrite(2, !val);
digitalWrite(3, val);

In this way it will reduce the power consumption on the ESP8266
A question what your circuit look like ?

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