pflanzensensor-workshop/first-webserver/first-webserver.ino

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#include <WiFi.h>
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#include <DHT.h>
#include "credentials.h" // put your WIFI credentials in here
#define DHT_SENSOR_PIN 21 // ESP32 pin GIOP21 connected to DHT11 sensor
#define DHT_SENSOR_TYPE DHT11
#define AOUT_PIN 36 // ESP32 pin GIOP36 (ADC0) that connects to AOUT pin of moisture sensor
DHT dht_sensor(DHT_SENSOR_PIN, DHT_SENSOR_TYPE);
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// Replace with your network credentials
const char* ssid = secrect_ssid;
const char* password = secret_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() {
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Serial.begin(9600);
dht_sensor.begin(); // initialize the DHT sensor
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// 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(){
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// read humidity
float humi = dht_sensor.readHumidity();
// read temperature in Celsius
float tempC = dht_sensor.readTemperature();
// read temperature in Fahrenheit
float tempF = dht_sensor.readTemperature(true);
// read soil
int soil = analogRead(AOUT_PIN); // read the analog value from sensor
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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 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: #4CAF50; border: none; color: white; padding: 16px 40px;");
client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
client.println(".button2 {background-color: #555555;}</style></head>");
// Web Page Heading
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client.println("<body><h1>Pflanzensensor</h1>");
client.println("<img src='https://curious.bio/wp-content/uploads/2021/04/cropped-cropped-Curious_Community_Labs_Logo_fit.png' width=200><br />");
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// Display current state, and ON/OFF buttons for GPIO 26
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client.println("<p><b>Temperature:</b> ");
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client.println(tempC);
client.println("&deg;C</p>");
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client.println("<p><b>Humidity:</b> ");
client.println(humi);
client.println(" %</p>");
client.println("<p><b>Soil moisture value:</b> ");
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client.println(soil);
client.println("</p>");
client.println("<script>window.setTimeout(() => {window.location.href = window.location.href}, 1000)</script>");
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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("");
}
}