Please help to solve errors in this Arduino code

[sri415]

#include <PulseSensorPlayground.h> // Pulse Sensor library
#include <SoftwareSerial.h> // Library for GSM module
#include <TinyGPS++.h> // Library for GPS module
#include <LiquidCrystal_I2C.h> // Library for I2C LCD

#define HEARTBEAT_PIN A0 // Connect the heartbeat sensor to this pin
#define SOUND_PIN A1 // Connect the sound sensor to this pin
#define GSM_RX_PIN 10 // GSM module RX pin
#define GSM_TX_PIN 11 // GSM module TX pin

// Create objects for the required sensors
PulseSensorPlayground pulseSensor;
SoftwareSerial gsmSerial(GSM_RX_PIN, GSM_TX_PIN);
TinyGPSPlus gps;
LiquidCrystal_I2C lcd(0x27, 16, 2); // Change the address if necessary

// Set threshold values for heartbeat and sound sensors
const int heartbeatThreshold = 90; // Adjust this value as needed
const int soundThreshold = 500; // Adjust this value as needed

// Variables to store sensor readings
int heartbeatValue = 0;
int soundValue = 0;

// Variables to manage emergency alerts
bool emergencyAlertSent = false;
unsigned long lastAlertTime = 0;
const unsigned long alertCooldown = 30000; // Minimum time between consecutive alerts (30 seconds)

void sendSMS(const char* recipient, const char* message) {
gsmSerial.println("AT+CMGF=1"); // Set SMS mode to text
delay(100);
gsmSerial.print("AT+CMGS="");
gsmSerial.print(recipient);
gsmSerial.println(""");
delay(100);
gsmSerial.print(message);
delay(100);
gsmSerial.write(26); // End SMS message
delay(1000);
}

// Function to send an emergency alert via GSM
void sendEmergencyAlert() {
if (!emergencyAlertSent && (millis() - lastAlertTime >= alertCooldown)) {
// Get child's location
if (gps.location.isValid() && gps.location.age() < 2000) {
float latitude = gps.location.lat();
float longitude = gps.location.lng();

  // Send the emergency SMS with the Google Maps link
  char googleMapsUrl[100];
  snprintf(googleMapsUrl, sizeof(googleMapsUrl),
           "https://www.google.com/maps?q=%.6f,%.6f", latitude, longitude);

  char smsMessage[160];
  snprintf(smsMessage, sizeof(smsMessage),
           "Emergency! Child needs help! Check their location: %s", googleMapsUrl);

  sendSMS("+919676475713", smsMessage); // Replace with the recipient's phone number
  emergencyAlertSent = true;
  lastAlertTime = millis();
}

}
}

void setup() {
lcd.begin(16, 2);
lcd.print("Heartbeat: ");

pulseSensor.setup(HEARTBEAT_PIN);
gsmSerial.begin(9600);
// Initialize other sensors and modules (GPS, GSM)
// Add necessary setup for GPS module, if required
}

void loop() {
pulseSensor.update(); // Update the pulse sensor data
soundValue = analogRead(SOUND_PIN); // Read sound sensor data

// Check for incoming SMS
if (gsmSerial.available()) {
String sms = gsmSerial.readStringUntil('\n');
sms.trim();
// Check if the received SMS contains the "LOC" command
if (sms.equalsIgnoreCase("LOC")) {
// Send the child's location to the sender's phone number
if (gps.location.isValid() && gps.location.age() < 2000) {
float latitude = gps.location.lat();
float longitude = gps.location.lng();
char googleMapsUrl[100];
snprintf(googleMapsUrl, sizeof(googleMapsUrl),
"https://www.google.com/maps?q=%.6f,%.6f", latitude, longitude);

    char smsMessage[160];
    snprintf(smsMessage, sizeof(smsMessage),
             "Child's Location: %s", googleMapsUrl);
    sendSMS("+919676475713", smsMessage); // Replace with the sender's phone number
  } else {
    // GPS data is not valid or too old
    sendSMS("+919676475713", "Unable to get child's location.");
  }
}

}

// Check for emergency conditions and send alerts
if (pulseSensor.sawNewSample()) {
heartbeatValue = pulseSensor.getBeatsPerMinute();
if (heartbeatValue > heartbeatThreshold) {
sendEmergencyAlert();
}
}

if (soundValue > soundThreshold) {
sendEmergencyAlert();
}

// Reset emergency alert flag if conditions are back to normal
if (emergencyAlertSent && heartbeatValue <= heartbeatThreshold && soundValue <= soundThreshold) {
emergencyAlertSent = false;
}

// Display the heartbeat value on the LCD
lcd.setCursor(11, 0); // Move the cursor to the 12th column of the first row
lcd.print(heartbeatValue);
lcd.print(" bpm");
}