"Added Arduino code for sending data from sensors to server"

Arduino/sketch_apr23a/sketch_apr23a.ino

@@ -0,0 +1,95 @@
+#include <WiFi.h>
+
+const char* ssid = "5G";           // Replace with your WiFi SSID
+const char* password = "qwertyfdsa";  // Replace with your WiFi password
+const char* server = "192.168.252.4"; // IP address of your Flask server
+const int serverPort = 5000;          // Port number of your Flask server
+const char* endpoint = "/ph_sensor";  // Endpoint to send pH sensor data
+
+const int phPin = 34; // Change this to the GPIO pin connected to the pH sensor
+
+// Calibration constants
+const float m = 3.5; // Replace with your slope constant
+const float b = -1.0; // Replace with your intercept constant
+
+void setup() {
+  Serial.begin(115200);
+  delay(10);
+
+  // Connect to Wi-Fi
+  Serial.println();
+  Serial.println();
+  Serial.print("Connecting to ");
+  Serial.println(ssid);
+
+  WiFi.begin(ssid, password);
+  int attempts = 0;
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+    attempts++;
+    if (attempts > 20) {
+      Serial.println("Connection failed. Check your credentials or network.");
+      while (true) {
+        // Stay in a loop to indicate connection failure
+      }
+    }
+  }
+  Serial.println("");
+  Serial.println("WiFi connected");
+  Serial.println("IP address: ");
+  Serial.println(WiFi.localIP());
+}
+
+void loop() {
+  // Read pH sensor value
+  float phValue = readPH();
+
+  // Print pH value to Serial Monitor
+  Serial.print("pH value: ");
+  Serial.println(phValue);
+
+  // Send data to server
+  sendData(phValue);
+
+  delay(5000); // Adjust delay as needed for your project
+}
+
+
+float readPH() {
+  // Read pH sensor value and convert to pH using appropriate formula
+  int sensorValue = analogRead(phPin);
+  float voltage = sensorValue * (5.0 / 1023.0); // Convert ADC value to voltage (assuming 10-bit ADC)
+  // Assuming a linear relationship: pH = m * voltage + b
+  float pHValue = m * voltage + b; // Replace m and b with your calibration constants
+  return pHValue;
+}
+
+void sendData(float phValue) {
+  WiFiClient client;
+  if (!client.connect(server, serverPort)) {
+    Serial.println("Connection failed");
+    return;
+  }
+
+  // Create HTTP POST request with pH sensor data
+  String postData = "ph_value=" + String(phValue);
+  client.println("POST " + String(endpoint) + " HTTP/1.1");
+  client.println("Host: " + String(server));
+  client.println("Content-Type: application/x-www-form-urlencoded");
+  client.println("Content-Length: " + String(postData.length()));
+  client.println();
+  client.println(postData);
+
+  delay(10); // Wait for the server to respond
+
+  // Read and print the response from the server
+  while (client.available()) {
+    String line = client.readStringUntil('\r');
+    Serial.print(line);
+  }
+
+  Serial.println();
+  Serial.println("Request complete");
+  client.stop(); // Close connection
+}