from machine import I2C, Pin
import time
from i2c_lcd1602 import I2C_LCD1602  # 需部署专用驱动库
import dht
import machine
import time

# Set up the DHT22 sensor on GPIO pin 20
sensor = dht.DHT22(machine.Pin(20))
# 初始化I2C总线（推荐参数）
i2c = I2C(0, scl=Pin(1), sda=Pin(0), freq=400_000)

# 扫描设备地址（关键步骤）
print("检测到I2C设备:", [hex(addr) for addr in i2c.scan()])  # 输出应为0x27/0x3F等[6](@ref)

# 创建LCD对象（参数：地址、列数、行数）
lcd = I2C_LCD1602(i2c, 0x27)
# 初始化开关
push_switch=Pin(2, Pin.IN)
slide_switch= Pin(28, Pin.IN)
led=Pin(26,Pin.OUT)
while True:
    try:
        # Measure temperature and humidity
        sensor.measure()
        
        # Get temperature and humidity values
        temperature = sensor.temperature()  # In Celsius
        humidity = sensor.humidity()        # In percentage
        
        # Print the temperature and humidity
        print('Temperature: {}°C'.format(temperature))
        print('Humidity: {}%'.format(humidity))
        
        if(slide_switch.value()):
            # 初始化显示
            lcd.clear()
            lcd.backlight(True)  # 开启背光
            led.on()
            lcd.puts('Tem: {}°C'.format(temperature), 0, 0)  # 第一行显示
            lcd.puts('Hum: {}%'.format(humidity), 0, 1)  # 第二行显示
        else:
            lcd.clear()
            lcd.backlight(False)
            led.off()
    except OSError as e:
        print('Failed to read sensor data:', e)
    
    time.sleep(1)  # Wait 2 seconds before next reading