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Arduino IDE Source Code

+#include <WiFi.h> // Updated to <WiFi.h> for ESP32
+#include <ThingSpeak.h>
+
+// Wi-Fi credentials
+const char* ssid = "HometelecomDX1A2G";        // Replace with your Wi-Fi SSID
+const char* password = "qg2r2cdJG3fnr79t";     // Replace with your Wi-Fi Password
+
+// ThingSpeak details
+unsigned long myChannelNumber = 2808525;       // Your ThingSpeak channel number
+const char* myWriteAPIKey = "T9ZPZQW4H3N2LL83"; // Your ThingSpeak Write API Key
+
+// Wi-Fi client and server
+WiFiServer server(80);                         // HTTP server running on port 80
+WiFiClient client;
+
+// Pin definitions
+#define SOIL_SENSOR_PIN A0                     // Analog pin for soil moisture sensor
+#define BUZZER 5                               // Pin for buzzer
+
+// Threshold and sensor variables
+int threshold = 450;                           // Moisture threshold value
+int soilMoistureValue = 0;                     // Raw soil moisture value
+int soilMoisturePercent = 0;                   // Soil moisture percentage
+bool buzzerState = false;                      // State of the buzzer
+
+
+void setup() {
+  pinMode(BUZZER, OUTPUT);
+  Serial.begin(115200);                        // Start Serial Monitor
+
+  // Connect to Wi-Fi
+  Serial.print("Connecting to Wi-Fi");
+  WiFi.begin(ssid, password);
+
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(1000);
+    Serial.print(".");
+  }
+
+  Serial.println("\nConnected to Wi-Fi");
+  Serial.print("IP Address: ");
+  Serial.println(WiFi.localIP());
+
+  // Start HTTP server
+  server.begin();
+
+  // Initialize ThingSpeak
+  ThingSpeak.begin(client);
+}
+
+void loop() {
+  // Handle HTTP client connections
+  WiFiClient client = server.available();
+  if (client) {
+    Serial.println("New client connected");
+    String request = client.readStringUntil('\r');
+    Serial.println("Request: " + request);
+    client.flush();
+
+    // Respond to client
+    String response = "HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\n\r\n";
+    response += "Soil Moisture Value: " + String(soilMoistureValue) + "\n";
+    response += "Soil Moisture Percentage: " + String(soilMoisturePercent) + "%";
+    response += "Buzzer State: " + String(buzzerState ? "ON" : "OFF");
+    client.print(response);
+    client.stop();
+    Serial.println("Response sent");
+  }
+
+  // Read soil moisture value
+  soilMoistureValue = analogRead(SOIL_SENSOR_PIN);
+
+  // Convert to percentage
+  soilMoisturePercent = map(soilMoistureValue, 0, 1023, 0, 100);
+
+  // Debugging output
+  Serial.print("Soil Moisture Value: ");
+  Serial.println(soilMoistureValue);
+  Serial.print("Soil Moisture Percentage: ");
+  Serial.println(soilMoisturePercent);
+
+  // Check moisture threshold and control buzzer
+  if (soilMoistureValue < threshold) {
+    digitalWrite(BUZZER, HIGH);                // Turn on buzzer
+    Serial.println("Soil is too dry!");
+  } else {
+    digitalWrite(BUZZER, LOW);                 // Turn off buzzer
+  }
+
+  // Send data to ThingSpeak
+  ThingSpeak.setField(1, soilMoisturePercent);
+  int response = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
+
+  if (response == 200) {
+    Serial.println("Data sent to ThingSpeak successfully!");
+  } else {
+    Serial.print("Error sending data to ThingSpeak. HTTP Error code: ");
+    Serial.println(response);
+  }
+
+  // Delay before the next iteration (minimize client requests and ThingSpeak updates)
+  delay(15000);
+  }
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