from machine import Pin
import time
import dht
import random  # 导入随机数模块

# 定义DHT11控制对象
dht11 = dht.DHT11(Pin(27))

# 程序入口
if __name__ == "__main__":
    time.sleep(1)  # 首次启动间隔1S让传感器稳定
    while True:
        dht11.measure()  # 调用DHT类库中测量数据的函数
        temp = dht11.temperature()
        humi = dht11.humidity()
        
        if temp is None:
            print("DHT11传感器检测失败！")
        else:
            # 给温度和湿度加上符合传感器精度的微小随机波动
            # 温度波动：±2℃
            temp_with_rand = temp + random.uniform(-2, 2)
            # 湿度波动：±5%RH
            humi_with_rand = humi + random.uniform(-5, 5)
            
            # 格式化输出，保留1位小数
            print("temp=%.1f°C  humi=%.1fRH" % (temp_with_rand, humi_with_rand))
        
        time.sleep(2)  # 间隔2秒读取一次