Added code for heartrate monitoring

Tracking Players and Crowd Monitoring/IoT Sensor Testing/Heartrate monitoring/Heartrate monitoring.ino

@@ -0,0 +1,93 @@
+#include <ArduinoBLE.h>
+
+// Function Declarations
+void initializeBLE();
+void discoverAndConnect();
+void printData(const unsigned char data[], int length);
+
+void setup() {
+  Serial.begin(9600);
+  while (!Serial);
+  Serial.println("Step 1: Starting Service");
+  initializeBLE();
+}
+
+void loop() {
+  discoverAndConnect();
+  BLE.poll();  // Poll for BLE events and communication updates.
+}
+
+void initializeBLE() {
+  Serial.println("Step 2: Initializing BLE");
+
+  if (!BLE.begin()) {
+    Serial.println("Step 2: BLE failed!");
+    while (1);
+  }
+
+  Serial.println("Step 3: BLE Successful");
+  BLE.scanForUuid("180D");
+}
+
+void discoverAndConnect() {
+  BLEDevice peripheral = BLE.available();
+
+  if (peripheral) {
+    Serial.println("Step 4: Scanning Device");
+    Serial.print("Peripheral Name: ");
+    Serial.println(peripheral.localName());
+
+    if (peripheral.localName() == "TICKR 0A5B") {
+      Serial.println("Step 5: Device Found");
+      Serial.println("Step 6: Connecting ...");
+      BLE.stopScan();
+
+      if (peripheral.connect()) {
+        Serial.println("Step 7: Connected To Sensor");
+
+        Serial.println("Step 8: Discovering attributes ...");
+        if (peripheral.discoverAttributes()) {
+          Serial.println("Step 9: Attributes Discovered Successfully");
+
+          BLEService service180D = peripheral.service("180D");
+          if (service180D) {
+            BLECharacteristic characteristic2A37 = service180D.characteristic("2A37");
+            if (characteristic2A37) {
+              characteristic2A37.subscribe();
+              Serial.println("Step 10: Connected to Data Stream of Sensor. Started Fetching Data ....");
+              while (true) {
+                peripheral.poll();
+                if (characteristic2A37.valueUpdated()) {
+                  printData(characteristic2A37.value(), characteristic2A37.valueLength());
+                }
+              }
+            } else {
+              Serial.println("Step 10: Characteristic 2A37 not found");
+            }
+          } else {
+            Serial.println("Step 10: Service 180D not found");
+          }
+        } else {
+          Serial.println("Step 9: Discovering attributes failed");
+          peripheral.disconnect();
+          return;
+        }
+      } else {
+        Serial.println("Step 7: Connection Failed");
+        return;
+      }
+    } else {
+      Serial.println("Step 6: Sensor Not Found");
+    }
+  }
+}
+
+void printData(const unsigned char data[], int length) {
+  for (int i = 0; i < length; i++) {
+    if (i == 1) {
+      unsigned char b = data[i];
+      Serial.print("Heart Rate Value (BPM) = ");
+      Serial.println(b);
+    }
+  }
+}