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theinfinoxtheinfinox
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Code supports message receiving
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‎IOT_msg/IOT_msg.ino

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#include <ESP8266WiFi.h>
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#include <ESP8266WebServer.h>
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#include <SPI.h>
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#include <Wire.h>
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#include <Adafruit_GFX.h>
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#include <Adafruit_SSD1306.h>
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const char* ssid = "pi"; // Enter SSID here
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const char* password = "raspberry"; //Enter Password here
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ESP8266WebServer server(80);
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uint8_t LEDpin = 2;
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bool LEDstatus = LOW;
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#define SCREEN_WIDTH 128 // OLED display width, in pixels
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#define SCREEN_HEIGHT 64 // OLED display height, in pixels
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// Declaration for SSD1306 display connected using I2C
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#define OLED_RESET -1 // Reset pin
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#define SCREEN_ADDRESS 0x3C
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Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
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String message; // Global variable to store the received message
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void setup() {
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Serial.begin(9600);
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delay(100);
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pinMode(LEDpin, OUTPUT);
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// Initialize the OLED display
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if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
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Serial.println(F("SSD1306 allocation failed"));
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for(;;);
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}
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display.display();
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delay(2000); // Pause for 2 seconds
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// Clear the display buffer
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display.clearDisplay();
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display.setTextSize(1);
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display.setTextColor(SSD1306_WHITE);
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display.setCursor(0,0);
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display.println("Connecting to WiFi...");
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display.display();
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// Connect to WiFi
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Serial.println("Connecting to " + String(ssid));
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WiFi.begin(ssid, password);
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while (WiFi.status() != WL_CONNECTED) {
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delay(1000);
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Serial.print(".");
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}
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Serial.println("");
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Serial.println("WiFi connected..!");
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Serial.print("Got IP: ");
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Serial.println(WiFi.localIP());
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// Setup HTTP server endpoints
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server.on("/", handle_OnConnect);
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server.on("/ledon", handle_ledon);
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server.on("/ledoff", handle_ledoff);
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server.on("/handle_msg",handle_msg);
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server.onNotFound(handle_NotFound);
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server.begin();
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Serial.println("HTTP server started");
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}
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void loop() {
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server.handleClient();
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// Control LED based on LEDstatus
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digitalWrite(LEDpin, LEDstatus ? HIGH : LOW);
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// Update OLED display with serial output
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updateDisplay();
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}
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void handle_OnConnect() {
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LEDstatus = LOW;
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server.send(200, "text/html", SendHTML(false));
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}
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void handle_ledon() {
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LEDstatus = HIGH;
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server.send(200, "text/html", SendHTML(true));
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}
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void handle_ledoff() {
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LEDstatus = LOW;
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server.send(200, "text/html", SendHTML(false));
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}
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void handle_msg() {
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if (server.args() > 0) { // Check if there are any arguments in the request
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for (uint8_t i = 0; i < server.args(); i++) { // Iterate through each argument
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if (server.argName(i) == "message") { // Check if the argument is named "message"
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message = server.arg(i); // Store the value of the "message" argument
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break; // Exit the loop after finding the "message" argument
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}
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}
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}
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// Process the received message
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// Here you can perform any actions you want with the received message
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// For this example, let's just print the message to the Serial monitor
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Serial.print("Received message: ");
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Serial.println(message);
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// Update the OLED display with the latest message
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updateDisplay();
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// You can add further processing logic here based on the received message
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// Send a response back to the client
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server.send(200, "text/plain", "Message received: " + message);
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}
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void handle_NotFound(){
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server.send(404, "text/plain", "Not found");
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}
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String SendHTML(uint8_t led){
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String ptr = "<!DOCTYPE html>\n";
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ptr +="<html>\n";
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ptr +="<head>\n";
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ptr +="<title>LED Control</title>\n";
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ptr +="</head>\n";
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ptr +="<body>\n";
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ptr +="<h1>LED</h1>\n";
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ptr +="<p>Click to switch LED on and off.</p>\n";
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ptr +="<form method=\"get\">\n";
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if(led)
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ptr +="<input type=\"button\" value=\"LED ON\" onclick=\"window.location.href='/ledoff'\">\n";
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else
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ptr +="<input type=\"button\" value=\"LED OFF\" onclick=\"window.location.href='/ledon'\">\n";
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ptr +="</form>\n";
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ptr += "<form method=\"get\" action=\"/handle_msg\">\n";
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ptr += "<input type=\"text\" name=\"message\">\n";
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ptr += "<input type=\"submit\" value=\"Send Message\">\n";
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ptr += "</form>\n";
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ptr +="<p><a href=\"/temp\">Get Temperature</a></p>\n";
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ptr +="<p><a href=\"/humidity\">Get Humidity</a></p>\n";
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ptr +="</body>\n";
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ptr +="</html>\n";
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return ptr;
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}
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void updateDisplay() {
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// Clear the display buffer
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display.clearDisplay();
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display.setTextSize(1);
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display.setTextColor(SSD1306_WHITE);
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display.setCursor(0,0);
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// Print serial outputs
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display.println("LED Status: " + String(LEDstatus ? "OFF" : "ON"));
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display.println("IP Address: " + WiFi.localIP().toString());
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display.println("Received message:"); // Display a label
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display.println(message);
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// Display buffer on OLED
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display.display();
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}

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