This is ESP-01S 5V Wifi Relay Module. It is designed for smart home, internet and other DIY projects. With this smart relay, it is easy to DIY your smart switch to control any device by your phone anywhere.
Features:
- Operating voltage: DC5V-9V
- Communication: WIFI (ESP8266-01S module)
- Working current: ≥250mA
- Transmission distance: the maximum transmission distance of 400m (open environment, mobile phone equipped with WIFI module)
- Load: 10A/250VAC 10A/30VDC, the relay pull 100,000 times
- Dimensions: 37mm X 25mm
Package Includes:
- 1 x ESP-01S Relay Module only
Arduino Code
// Load Wi-Fi library
#include <ESP8266WiFi.h>
// Replace with your network credentials
const char* ssid = "Ekostra.com";
const char* password = "Ekostra.com";
// Set web server port number to 80
WiFiServer server(80);
// Variable to store the HTTP request
String header;
// Auxiliar variables to store the current output state
String output0State = "off";
String output2State = "off";
// Assign output variables to GPIO pins
const int output0 = 0;
const int output2 = 2;
void setup() {
Serial.begin(115200);
pinMode(output0, OUTPUT);
pinMode(output2, OUTPUT);
// Set outputs to LOW
digitalWrite(output0, LOW);
digitalWrite(output2, LOW);
delay(500);
Serial.print("MAC address: ");
Serial.println(WiFi.macAddress());
// Connect to Wi-Fi network with SSID and password
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
// Print local IP address and start web server
Serial.println("");
Serial.println("WiFi connected.");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
server.begin();
}
void loop(){
WiFiClient client = server.available(); // Listen for incoming clients
if (client) { // If a new client connects,
Serial.println("New Client."); // print a message out in the serial port
String currentLine = ""; // make a String to hold incoming data from the client
while (client.connected()) { // loop while the client's connected
if (client.available()) { // if there's bytes to read from the client,
char c = client.read(); // read a byte, then
Serial.write(c); // print it out the serial monitor
header += c;
if (c == 'n') { // if the byte is a newline character
// if the current line is blank, you got two newline characters in a row.
// that's the end of the client HTTP request, so send a response:
if (currentLine.length() == 0) {
// HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
// and a content-type so the client knows what's coming, then a blank line:
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println("Connection: close");
client.println();
// turns the GPIOs on and off
if (header.indexOf("GET /0/on") >= 0) {
Serial.println("GPIO 0 on");
output0State = "on";
digitalWrite(output0, HIGH);
} else if (header.indexOf("GET /0/off") >= 0) {
Serial.println("GPIO 0 off");
output0State = "off";
digitalWrite(output0, LOW);
} else if (header.indexOf("GET /2/on") >= 0) {
Serial.println("GPIO 2 on");
output2State = "on";
digitalWrite(output2, HIGH);
} else if (header.indexOf("GET /2/off") >= 0) {
Serial.println("GPIO 2 off");
output2State = "off";
digitalWrite(output2, LOW);
}
// Display the HTML web page
client.println("<!DOCTYPE html><html>");
client.println("<head><meta name="viewport" content="width=device-width, initial-scale=1">");
client.println("<link rel="icon" href="data:,">");
// CSS to style the on/off buttons
// Feel free to change the background-color and font-size attributes to fit your preferences
client.println("<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}");
client.println(".button { background-color: #195B6A; border: none; color: white; padding: 16px 40px;");
client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
client.println(".button2 {background-color: #77878A;}</style></head>");
// Web Page Heading
client.println("<body><h1>ESP8266 Web Server</h1>");
// Display current state, and ON/OFF buttons for GPIO 5
client.println("<p>GPIO 0 - State " + output0State + "</p>");
// If the output0State is off, it displays the ON button
if (output0State=="off") {
client.println("<p><a href="/0/on"><button class="button">ON</button></a></p>");
} else {
client.println("<p><a href="/0/off"><button class="button button2">OFF</button></a></p>");
}
// Display current state, and ON/OFF buttons for GPIO 2
client.println("<p>GPIO 2 - State " + output2State + "</p>");
// If the output2State is off, it displays the ON button
if (output2State=="off") {
client.println("<p><a href="/2/on"><button class="button">ON</button></a></p>");
} else {
client.println("<p><a href="/2/off"><button class="button button2">OFF</button></a></p>");
}
client.println("</body></html>");
// The HTTP response ends with another blank line
client.println();
// Break out of the while loop
break;
} else { // if you got a newline, then clear currentLine
currentLine = "";
}
} else if (c != 'r') { // if you got anything else but a carriage return character,
currentLine += c; // add it to the end of the currentLine
}
}
}
// Clear the header variable
header = "";
// Close the connection
client.stop();
Serial.println("Client disconnected.");
Serial.println("");
}
}
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