135 lines
5.6 KiB
C++
135 lines
5.6 KiB
C++
// Load Wi-Fi library
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#include <WiFi.h>
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#include <Wire.h>
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#include <Adafruit_BME280.h>
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#include <Adafruit_Sensor.h>
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#define SEALEVELPRESSURE_HPA (1013.25)
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Adafruit_BME280 bme; // I2C
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//Adafruit_BME280 bme(BME_CS); // hardware SPI
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//Adafruit_BME280 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK); // software SPI
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// Replace with your network credentials
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const char* ssid = "REPLACE_WITH_YOUR_SSID";
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const char* password = "REPLACE_WITH_YOUR_PASSWORD";
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// Set web server port number to 80
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WiFiServer server(80);
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// Variable to store the HTTP request
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String header;
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// Current time
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unsigned long currentTime = millis();
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// Previous time
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unsigned long previousTime = 0;
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// Define timeout time in milliseconds (example: 2000ms = 2s)
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const long timeoutTime = 2000;
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void setup() {
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Serial.begin(115200);
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bool status;
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// default settings
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// (you can also pass in a Wire library object like &Wire2)
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//status = bme.begin();
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if (!bme.begin(0x76)) {
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Serial.println("Could not find a valid BME280 sensor, check wiring!");
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while (1);
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}
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// Connect to Wi-Fi network with SSID and password
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Serial.print("Connecting to ");
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Serial.println(ssid);
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WiFi.begin(ssid, password);
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while (WiFi.status() != WL_CONNECTED) {
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delay(500);
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Serial.print(".");
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}
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// Print local IP address and start web server
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Serial.println("");
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Serial.println("WiFi connected.");
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Serial.println("IP address: ");
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Serial.println(WiFi.localIP());
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server.begin();
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}
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void loop(){
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WiFiClient client = server.available(); // Listen for incoming clients
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if (client) { // If a new client connects,
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currentTime = millis();
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previousTime = currentTime;
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Serial.println("New Client."); // print a message out in the serial port
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String currentLine = ""; // make a String to hold incoming data from the client
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while (client.connected() && currentTime - previousTime <= timeoutTime) { // loop while the client's connected
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currentTime = millis();
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if (client.available()) { // if there's bytes to read from the client,
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char c = client.read(); // read a byte, then
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Serial.write(c); // print it out the serial monitor
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header += c;
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if (c == '\n') { // if the byte is a newline character
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// if the current line is blank, you got two newline characters in a row.
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// that's the end of the client HTTP request, so send a response:
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if (currentLine.length() == 0) {
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// HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
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// and a content-type so the client knows what's coming, then a blank line:
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client.println("HTTP/1.1 200 OK");
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client.println("Content-type:text/html");
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client.println("Connection: close");
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client.println();
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// Display the HTML web page
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client.println("<!DOCTYPE html><html>");
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client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
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client.println("<link rel=\"icon\" href=\"data:,\">");
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// CSS to style the table
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client.println("<style>body { text-align: center; font-family: \"Trebuchet MS\", Arial;}");
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client.println("table { border-collapse: collapse; width:35%; margin-left:auto; margin-right:auto; }");
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client.println("th { padding: 12px; background-color: #0043af; color: white; }");
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client.println("tr { border: 1px solid #ddd; padding: 12px; }");
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client.println("tr:hover { background-color: #bcbcbc; }");
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client.println("td { border: none; padding: 12px; }");
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client.println(".sensor { color:white; font-weight: bold; background-color: #bcbcbc; padding: 1px; }");
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// Web Page Heading
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client.println("</style></head><body><h1>ESP32 with BME280</h1>");
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client.println("<table><tr><th>MEASUREMENT</th><th>VALUE</th></tr>");
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client.println("<tr><td>Temp. Celsius</td><td><span class=\"sensor\">");
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client.println(bme.readTemperature());
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client.println(" *C</span></td></tr>");
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client.println("<tr><td>Temp. Fahrenheit</td><td><span class=\"sensor\">");
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client.println(1.8 * bme.readTemperature() + 32);
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client.println(" *F</span></td></tr>");
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client.println("<tr><td>Pressure</td><td><span class=\"sensor\">");
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client.println(bme.readPressure() / 100.0F);
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client.println(" hPa</span></td></tr>");
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client.println("<tr><td>Approx. Altitude</td><td><span class=\"sensor\">");
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client.println(bme.readAltitude(SEALEVELPRESSURE_HPA));
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client.println(" m</span></td></tr>");
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client.println("<tr><td>Humidity</td><td><span class=\"sensor\">");
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client.println(bme.readHumidity());
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client.println(" %</span></td></tr>");
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client.println("</body></html>");
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// The HTTP response ends with another blank line
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client.println();
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// Break out of the while loop
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break;
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} else { // if you got a newline, then clear currentLine
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currentLine = "";
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}
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} else if (c != '\r') { // if you got anything else but a carriage return character,
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currentLine += c; // add it to the end of the currentLine
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}
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}
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}
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// Clear the header variable
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header = "";
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// Close the connection
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client.stop();
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Serial.println("Client disconnected.");
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Serial.println("");
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}
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} |