print("Program: Sensor Detection")
print("Date: 14/11/2024")
print("by jd")


# Import Libraries
import dht           # Library to interface with DHT22 sensor
import machine       # Library for configuring GPIO pins
import time          # Library to handle delays

# Pin Declaration
data_pin = 13 # DHT22 connected to GPIO pin 13

# Object Declaration
sensor = dht.DHT22(machine.Pin(data_pin))  # Create DHT22 object on the specified pin

# Save Data to File
def save_data_to_file(temp, humidity):

    #Function to save sensor data to a text file
    try:
        # Save data to a text file on the ESP32's filesystem
        with open('/data.txt', 'a') as f:  # Open file in append mode
            f.write('Temperature: {:.2f}°C, Humidity: {:.2f}%\n'.format(temp, humidity))
        print('Data saved to file.')
    except Exception as e:
        print('Failed to save data to file:', e)

# Main Program
def main():
    """Main program loop"""
    print('DHT22 Sensor Program Running...')
    while True:
        try:
            # Measure temperature and humidity
            sensor.measure()
            temp = sensor.temperature()  # Temperature in Celsius
            humidity = sensor.humidity()  # Humidity in percentage

            # Print the readings to the console (REPL)
            print('Temperature: {:.2f}°C'.format(temp))
            print('Humidity: {:.2f}%'.format(humidity))

            # Save data to the file if the readings are valid
            save_data_to_file(temp, humidity)

        except OSError as e:
            # Handle errors
            print('Failed to read sensor:', e)

        # Wait for 2 seconds before taking the next reading
        time.sleep(2)

# Run the main program
if __name__ == '__main__':
    main()