switch.py

import cv2
import mediapipe as mp
import pyfirmata2
import math

board = pyfirmata2.Arduino("/dev/tty.usbmodem14201")
ledPin = board.get_pin("d:3:p")

cap = cv2.VideoCapture(0)
cap.set(cv2.CAP_PROP_FRAME_WIDTH, value=600)
cap.set(cv2.CAP_PROP_FRAME_HEIGHT, value=500)

mp_drawing = mp.solutions.drawing_utils

mp_hands = mp.solutions.hands
hand = mp_hands.Hands(max_num_hands=1)

while True:
    # ledPin.write(0.5)
    success, frame = cap.read()
    if success:
        RGB_frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
        result = hand.process(RGB_frame)
        if result.multi_hand_landmarks:
            handLandmarks = result.multi_hand_landmarks[0]
            thumbTip = handLandmarks.landmark[4]
            indexTip = handLandmarks.landmark[8]
            distance = math.sqrt((thumbTip.x - indexTip.x)**2 + (thumbTip.y - indexTip.y)**2)
            print(distance)

            if distance < 0.03:
                distance = 0
            ledPin.write(distance)
            for hand_landmarks in result.multi_hand_landmarks:
                # print(hand_landmarks)
                mp_drawing.draw_landmarks(frame, hand_landmarks, mp_hands.HAND_CONNECTIONS)

        cv2.imshow("capture image", frame) 
        if cv2.waitKey(1)== ord('q'):
            break
        
cv2.destroyAllWindows()