from dt22 import DHT22
from machine import Pin, I2C,PWM
import oled
import time  

pwm0 = PWM(Pin(4))            
pwm0.duty_u16(32768)
pwm0.deinit()                    #初始化pwm用于对蜂鸣器的控制

def interruput(line):
  if p18.value()==1:
    led_red.off();
    led_yellow.off();
    pwm0.deinit();
    time.sleep(10)              #按键的中断函数
p18=machine.Pin(18,machine.Pin.IN,machine.Pin.PULL_UP); #初始化按键
p18.irq(trigger=machine.Pin.IRQ_RISING,handler=interruput) #按键中断

DHT22 = DHT22(2)
resultList = [0, 0, 0, 0, 0]  #初始化DHT22

i2c = I2C(1, scl=Pin(27), sda=Pin(26))
oled_width = 128
oled_height = 64
oled = oled.SSD1306_I2C(oled_width, oled_height, i2c) #初始化Oled

led_red=Pin(14,Pin.OUT) 
led_yellow=Pin(15,Pin.OUT)  #初始化led

while True:                   
    oled.fill(0)                  #清屏
    time.sleep(3)
    DHT22.read_bytes(resultList)      #DHt22数据的采集
    HumData = ((resultList[0] << 8) + resultList[1]) / 10 #湿度
    TemData = ((resultList[2] << 8) + resultList[3]) / 10 #温度

    oled.text('RH={}% T={}C'.format(HumData,TemData), 0, 0)    #数据处理   
    oled.show()                                           #显示到oled
    if TemData>20:                                  #对温度进行判断
      pwm0.freq(1000)
      led_red.on()
    if HumData>30:                                 #对湿度进行判断
      pwm0.freq(1000)
      led_yellow.on()