太久没水，那可不行。今日又来写一段专业程序员看了也皱眉的垃圾全屋智能雏形代码。应该是笑掉大牙级别吧。下面进入正题。首先思路就是通过cvzone那个手势识别，判断开关灯指令。接下来是通过mqtt局域网里发布一下（注意打开防火墙）。最后是另一台机器订阅获得这个消息，解析出开关灯指令，然后执行动作。

手势识别与消息发布端：

import time
import cv2
import numpy as np
from cvzone.HandTrackingModule import HandDetector
from paho.mqtt import client as mqtt_clientbroker = '192.168.0.107'
port = 1883
topic = "/mqtt/lamp"def connect_mqtt():def on_connect(client, userdata, flags, rc):if rc == 0:print("Connected to MQTT Broker!")else:print("Failed to connect, return code %d\n", rc)client = mqtt_client.Client()client.on_connect = on_connectclient.connect(broker, port)return clientdef publish(client,msg_cmd):msg = f"messages: {msg_cmd}"result = client.publish(topic, msg)status = result[0]if status == 0:print(f"Send `{msg}` to topic `{topic}`")else:print(f"Failed to send message to topic {topic}")cap = cv2.VideoCapture(1)
hand_detector = HandDetector(maxHands=1,detectionCon=0.75)
client = connect_mqtt()
client.loop_start()while True:length_open = 0length_close = 0flag,img = cap.read()img = cv2.flip(img,1)if flag:hands,img = hand_detector.findHands(img,flipType=False)if hands:lmlist=hands[0]['lmList']# 食指与无名指碰撞开灯，# 大拇指和小指碰撞关灯# https://blog.csdn.net/vivo01/article/details/135071340lmlist[8] = lmlist[8][:2] #index_fingerlmlist[16] = lmlist[16][:2] #ring_fingerlmlist[4] = lmlist[4][:2] #thumblmlist[20] = lmlist[20][:2] #small fingerlength_open, _,img = hand_detector.findDistance(lmlist[8],lmlist[16],img)length_close,_,img = hand_detector.findDistance(lmlist[4],lmlist[20],img)if length_open * length_close == 0: #如果手部没有看完全等问题那么会重新循环读取。continueif length_open < 40 and length_close > 50:print("turn on")publish(client,"1")time.sleep(0.4)if length_close < 40 and length_open > 50:print("turn off")publish(client,"0")time.sleep(0.4)           cv2.imshow('img',img)key = cv2.waitKey(1)if key == ord('q'):breakelse:print('Camera failed')break
cap.release()
cv2.destroyAllWindows()

消息获得与硬件灯泡打开执行端：

import RPi.GPIO as GPIO
import paho.mqtt.client as mqtt
import timebroker = "192.168.0.107"
port = 1883
topic = "/mqtt/lamp"GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)LED=21
GPIO.setup(LED, GPIO.OUT)
GPIO.output(LED,GPIO.LOW)def on_connect(client, userdata, flags, rc):print("Connected with result code "+str(rc))client.subscribe(topic)def on_message(client, userdata, msg,ledpin=LED):mypay = msg.payload.decode("utf-8")#print ("message received:",msg.topic,mypay)print(mypay)if mypay[-1]=="1":GPIO.output(ledpin,GPIO.HIGH)if mypay[-1]=="0":GPIO.output(ledpin,GPIO.LOW)client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_messageclient.connect(broker,port)
#client.loop_forever()
try:client.loop_forever()
except:GPIO.output(LED,GPIO.LOW)