Web Server with BME280
Halo sobat pembelajar! Kali ini aku mencoba untuk membuat mini weather station. Percobaannya sederhana, yaitu menampilkan hasil pembacaan sensor BME280 ke web server.
Alat yang dibutuhkan:
1. Breadboard
2. Sensor BME280
3. Kabel jumper
4. ESP32
5. Kabel USB
6. PC/Laptop
A. Rangkaian
Buatlah rangkaian seperti skema di bawah ini.
B. Program
Tulis program seperti di bawah ini
/*********
Rui Santos
Complete project details at https://randomnerdtutorials.com
*********/
// Load Wi-Fi library
#include <WiFi.h>
#include <Wire.h>
#include <Adafruit_BME280.h>
#include <Adafruit_Sensor.h>
//uncomment the following lines if you're using SPI
/*#include <SPI.h>
#define BME_SCK 18
#define BME_MISO 19
#define BME_MOSI 23
#define BME_CS 5*/
#define SEALEVELPRESSURE_HPA (1013.25)
Adafruit_BME280 bme; // I2C
//Adafruit_BME280 bme(BME_CS); // hardware SPI
//Adafruit_BME280 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK); // software SPI
// Replace with your network credentials
const char* ssid = "REPLACE_WITH_YOUR_SSID";
const char* password = "REPLACE_WITH_YOUR_PASSWORD";
// Set web server port number to 80
WiFiServer server(80);
// Variable to store the HTTP request
String header;
// Current time
unsigned long currentTime = millis();
// Previous time
unsigned long previousTime = 0;
// Define timeout time in milliseconds (example: 2000ms = 2s)
const long timeoutTime = 2000;
void setup() {
Serial.begin(115200);
bool status;
// default settings
// (you can also pass in a Wire library object like &Wire2)
//status = bme.begin();
if (!bme.begin(0x76)) {
Serial.println("Could not find a valid BME280 sensor, check wiring!");
while (1);
}
// 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,
currentTime = millis();
previousTime = currentTime;
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() && currentTime - previousTime <= timeoutTime) { // loop while the client's connected
currentTime = millis();
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();
// 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 table
client.println("<style>body { text-align: center; font-family: \"Trebuchet MS\", Arial;}");
client.println("table { border-collapse: collapse; width:35%; margin-left:auto; margin-right:auto; }");
client.println("th { padding: 12px; background-color: #0043af; color: white; }");
client.println("tr { border: 1px solid #ddd; padding: 12px; }");
client.println("tr:hover { background-color: #bcbcbc; }");
client.println("td { border: none; padding: 12px; }");
client.println(".sensor { color:white; font-weight: bold; background-color: #bcbcbc; padding: 1px; }");
// Web Page Heading
client.println("</style></head><body><h1>ESP32 with BME280</h1>");
client.println("<table><tr><th>MEASUREMENT</th><th>VALUE</th></tr>");
client.println("<tr><td>Temp. Celsius</td><td><span class=\"sensor\">");
client.println(bme.readTemperature());
client.println(" *C</span></td></tr>");
client.println("<tr><td>Temp. Fahrenheit</td><td><span class=\"sensor\">");
client.println(1.8 * bme.readTemperature() + 32);
client.println(" *F</span></td></tr>");
client.println("<tr><td>Pressure</td><td><span class=\"sensor\">");
client.println(bme.readPressure() / 100.0F);
client.println(" hPa</span></td></tr>");
client.println("<tr><td>Approx. Altitude</td><td><span class=\"sensor\">");
client.println(bme.readAltitude(SEALEVELPRESSURE_HPA));
client.println(" m</span></td></tr>");
client.println("<tr><td>Humidity</td><td><span class=\"sensor\">");
client.println(bme.readHumidity());
client.println(" %</span></td></tr>");
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("");
}
}Jangan lupa untuk mengganti bagian ssid dan password sesuai wifi yang digunakan.
// Replace with your network credentials
const char* ssid = "REPLACE_WITH_YOUR_SSID";
const char* password = "REPLACE_WITH_YOUR_PASSWORD";C. Eksekusi
Verify dan upload program ke ESP32. Lalu tekan tombol EN pada ESP32. Kemudian cek IP Address di serial monitor.
Ketik IP Address yang muncul pada serial monitor di browser
Selamat mencoba!!!😀
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