Disaat maraknya kasus virus corona, saya tetap melanjutkan eksperimen ESP32 untuk membangun web server, tapi kali ini saya menambahkan sensor BME280. Sebelumnya kami berkesperimen secara berkelompok dengan menggunakan sensor DHT11, karena kebijakan sosial distancing dan kami tidak berada di kota yang sama untuk saat ini, akhirnya saya memutuskan untuk membeli sensor BME280 secara online hehe. Karena rasa penasaran saya terhadap percobaan web server pada ESP32 dan BME280 ini.
Sumber pembelajaran kali ini dapat di akses di https://randomnerdtutorials.com/esp32-web-server-with-bme280-mini-weather-station/
Sebelumnya saya sudah membangun web server dengan ESP32, langkah kali ini sama seperti pada percobaan sebelumnya kok:)
Alat dan Bahan:
- ESP32 development board
- BME280
- Breadboard
- Jumper
- USB cable
Lets Code…
/*********
Rui Santos
Complete project details at http://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 = "Galaxy A20s1216";
const char* password = "sulis tiana 123456788";
// Set web server port number to 80
WiFiServer server(80);
// Variable to store the HTTP request
String header;
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,
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();
// 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; border:1}");
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: #a8caff; color: black }");
client.println("td { border: none; padding: 12px; }");
client.println(".sensor { color:black; font-weight: bold; background-color: #a8caff; padding: 1px; }");
// Web Page Heading
client.println("</style></head><body><h1>ESP32 with BME280</h1>");
client.println("</style></head><body><h5>oleh: Sulis Tiana 18218036</h5>");
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.print(" *C</span></td></tr>");
client.println("<tr><td>Temp. Fahrenheit</td><td><span class=\"sensor\">");
client.print(1.8 * bme.readTemperature() + 32);
client.print(" *F</span></td></tr>");
client.println("<tr><td>Pressure</td><td><span class=\"sensor\">");
client.print(bme.readPressure() / 100.0F);
client.print(" hPa</span></td></tr>");
client.println("<tr><td>Approx. Altitude</td><td><span class=\"sensor\">");
client.print(bme.readAltitude(SEALEVELPRESSURE_HPA));
client.println(" m</span></td></tr>");
client.println("<tr><td>Humidity</td><td><span class=\"sensor\">");
client.print(bme.readHumidity());
client.print(" %</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("");
}
}
Disini, kalian juga bisa berkreasi pada tampilan web-nya. Tampilan web-nya ada di bagian code bagian html, dan kalian bisa menambahkan editan yang lebih menarik dengan menggunakan CSS.
Eitss.. jangan lupa ganti ssid dan password kalian yang ada di bagian code
const char* ssid = “ubah_dengan_ssid_kalian”
const char* password =”ubah_dengan_password_kalian”
Saya juga merubah sedikit tampilan web servernya dengan mengubah pada bagian HTML, dan CSS-nya.
Setelah mendapat ESP IP address, gunakana IP address tersebut untuk melihat hasilnya.
Berikut hasil percobaannya:’)
Eksperimen sebelumnya: web server pada ESP32
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