import cv2
import serial

arduino = serial.Serial('COM1', 9600)  # Replace 'COM1' with the appropriate port for your Arduino

face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')

def detect_faces_and_control_led(frame):
    gray_image = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    faces = face_cascade.detectMultiScale(gray_image)
    
    if len(faces) > 0:
        arduino.write(b'1')
    else:
        arduino.write(b'0')

video = cv2.VideoCapture(0)
while True:
    success, frame = video.read()
    if success:
        detect_faces_and_control_led(frame)
        cv2.imshow('Face Detection', frame)
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break
    else:
        print("Error: Unable to capture frame.")
        break

video.release()
cv2.destroyAllWindows()