Chen Yiyan-README

 import time
import paho.mqtt.client as mqtt
from machine import Pin, ADC, PWM

# Constants
BROKER = "broker.hivemq.com"
PORT = 1883
TOPIC_LIGHT = "home/light/intensity"
TOPIC_MOTION = "home/motion"
TOPIC_CONTROL = "home/control"
CLIENT_ID = "ESP8266_LightControl"

# Pin setup
light_sensor = ADC(Pin(32))  # Light sensor pin
motion_sensor = Pin(14, Pin.IN)  # Motion sensor pin
led = PWM(Pin(15), freq=5000)  # LED pin

# MQTT setup
client = mqtt.Client(CLIENT_ID)
client.connect(BROKER, PORT, 60)

def read_light_sensor():
    return light_sensor.read()

def read_motion_sensor():
    return motion_sensor.value()

def control_led(brightness):
    led.duty(brightness)

def on_message(client, userdata, message):
    payload = message.payload.decode("utf-8")
    if message.topic == TOPIC_CONTROL:
        if payload == "on":
            control_led(1023)  # Full brightness
        elif payload == "off":
            control_led(0)  # Turn off

client.on_message = on_message
client.subscribe(TOPIC_CONTROL)

client.loop_start()

try:
    while True:
        light_intensity = read_light_sensor()
        motion_detected = read_motion_sensor()
        
        # Adjust LED brightness based on light intensity
        if light_intensity < 3000:
            control_led(1023)
        else:
            control_led(0)
        
        # Publish sensor data
        client.publish(TOPIC_LIGHT, light_intensity)
        client.publish(TOPIC_MOTION, motion_detected)
        
        time.sleep(1)
finally:
    client.loop_stop()
    client.disconnect()