Py4OH—自制开源鸿蒙空气质量监控系统（上）

import pin
import sht30
import gpio
import os

i2cx = 0   # SHT30是一种i2c设备，位于0号i2c上
freq = 400000  # i2c通信频率
sda = gpio.make_id([0, 'A', 0])  # 计算sda所对应的引脚号
scl = gpio.make_id([0, 'A', 1])   # 计算scl所对应的引脚号

th = sht30.SHT30(i2cx, sda, scl, freq)   # 创建名为th的SHT30对象
th.open()  # 通过th对象打开SHT30设备

lpin = gpio.make_id([0, 'A', 2])  # 计算接入LED灯的引脚号

light = pin.Pin(lpin)  # 创建LED灯对象

while True :
    t = th.temperature()  # 获取温度数据
    h = th.humidity()      # 获取湿度数据
    
    if t != None : 
        print('temperature = ' + str(t))
        
    if h != None : 
        print('humidity = ' + str(h))
        
    if (18 <= t) and (t <= 25) :
        light.low()      # 若当前温度在体感舒适度范围内，则关闭LED灯
    else :
        light.change() # 若当前温度不在体感舒适度范围内，则改变LED灯的状态，即：闪烁
        
    os.sleep(1)

'''
   This is just a demo for interface definition.
'''
class Pin:
    is_high = False   
    def __init__(self, pin_num):
        pass
        
    def high(self):
        # output 1
        self.is_high = True
        
    def low(self):
        # output 0
        self.is_high = False
        
    def status(self):
        return 1 if self.is_high else 0
        
    def change(self):
        if self.is_high:
            self.low()
        else:
            self.high()
            
    def __del__(self):
        pass

class SHT30:
    sht30_addr = 0x44
    write_cmd = (sht30_addr << 1) | 0x00
    read_cmd = (sht30_addr << 1) | 0x01

    def __init__(self, i2cx, sda, scl, freq):
        pass

    def open(self):
        pass
    
    def close(self):
        pass

    def temperature(self):
        return None

    def humidity(self):
        return None
        
    def __del__(self):
        pass