因?yàn)榻?jīng)常在辦公室里面不知道實(shí)際室內(nèi)溫度是多少，所以用ESP32做了一個(gè)工具來進(jìn)行溫度&濕度的監(jiān)測。在之前的文章當(dāng)中，已經(jīng)完成了ESP32的數(shù)據(jù)上云工作，如果要進(jìn)行溫度/濕度的檢測。從原理上就是給ESP32連接對應(yīng)的傳感器，并把傳感器的數(shù)據(jù)上報(bào)到阿里云物聯(lián)網(wǎng)平臺(tái)。

我們先來看看效果

這樣的話，每天上班前在家里可以先看看辦公室空調(diào)是否已經(jīng)把公司的溫度提升上去，如果沒有提升上去。那說明可能空調(diào)有問題，今日的取暖只能靠抖了。

下面我們說說，這個(gè)實(shí)現(xiàn)怎么搞。首先在阿里云IOT平臺(tái)上，對我們之前的產(chǎn)品添加2個(gè)功能分別為當(dāng)前濕度和當(dāng)前溫度。

實(shí)現(xiàn)步驟如下：

根據(jù)所使用的硬件，進(jìn)行board.json的配置。 因?yàn)槲覀兊?a href="http://www.nncyjs.com/zhuanti/eXbz50" style="color:#4595e6;" target="_blank">溫度傳感器使用的是sht3x, 使用I2C，在board.json的配置如下：

{

    'name': 'haasedu',

    'version': '1.0.0',

    'io': { 

      'sht3x': {

        'type': 'I2C',

        'port': 0,

        'addrWidth': 7,

        'freq': 400000,

        'mode': 'master',

        'devAddr': 68

      } 

    },

    'debugLevel': 'ERROR',

    'repl': 'disable'

  }

實(shí)現(xiàn)代碼

from driver import I2C   

import sht3x        

def report_iot_data(temperature, humidity ):

    upload_data = {'params': ujson.dumps({

        'CurrentHumidity': humidity, 'CurrentTemperature':temperature    })

    }  

    device.postProps(upload_data)

    print('UPDATE IOT SUCCESS!!!')

    def get_light_temp_humi():

    temperature = humitureDev.getTemperature()        

    humidity = humitureDev.getHumidity()    

    report_iot_data(temperature, humidity)

    return temperature, humidity

i2cObj = I2C() i2cObj.open('sht3x')   humitureDev = sht3x.SHT3X(i2cObj)    

    while True:

    data = get_light_temp_humi()    

    utime.sleep(3)

進(jìn)行燒錄就可以了。

獲取溫度濕潤還需要使用Haas團(tuán)隊(duì)寫的一個(gè)驅(qū)動(dòng)，代碼如下

sht3x.py

'''

Copyright (C) 2015-2021 Alibaba Group Holding Limited

    MicroPython's driver for CHT8305

    Author: HaaS

    Date:   2021/09/14

'''from micropython import constimport utimefrom driver import I2C'''

# sht3x commands definations

# read serial number:                            CMD_READ_SERIALNBR  0x3780     

# read status register:                          CMD_READ_STATUS     0xF32D     

# clear status register:                         CMD_CLEAR_STATUS    0x3041  

# enabled heater:                                CMD_HEATER_ENABLE   0x306D   

# disable heater:                                CMD_HEATER_DISABLE  0x3066      

# soft reset:                                    CMD_SOFT_RESET      0x30A2      

# accelerated response time:                     CMD_ART             0x2B32

# break, stop periodic data acquisition mode:    CMD_BREAK           0x3093

# measurement: polling, high repeatability:      CMD_MEAS_POLLING_H  0x2400

# measurement: polling, medium repeatability:    CMD_MEAS_POLLING_M  0x240B

# measurement: polling, low repeatability:       CMD_MEAS_POLLING_L  0x2416

'''class SHT3X(object):

    # i2cDev should be an I2C object and it should be opened before __init__ is called

    def __init__(self, i2cDev):

        self._i2cDev = None

        if not isinstance(i2cDev, I2C):

            raise ValueError('parameter is not an I2C object')

        # make AHB21B's internal object points to _i2cDev

        self._i2cDev = i2cDev

        self.start()

    def start(self):

        # make sure AHB21B's internal object is valid before I2C operation

        if self._i2cDev is None:

            raise ValueError('invalid I2C object')

        # send clear status register command - 0x3041 - CMD_CLEAR_STATUS

        cmd = bytearray(2)

        cmd[0] = 0x30

        cmd[1] = 0x41

        self._i2cDev.write(cmd)

        # wait for 20ms

        utime.sleep_ms(20)

        return 0

    def getTempHumidity(self):

        if self._i2cDev is None:

            raise ValueError('invalid I2C object')

        tempHumidity = [-1, 2]

        # start measurement: polling, medium repeatability - 0x240B - CMD_MEAS_POLLING_M   

        # if you want to adjust measure repeatability, you can send the following commands:

        # high repeatability: 0x2400 - CMD_MEAS_POLLING_H

        # low repeatability: 0x2416  - CMD_MEAS_POLLING_L

        cmd = bytearray(2)

        cmd[0] = 0x24

        cmd[1] = 0x0b

        self._i2cDev.write(cmd)

        # must wait for a little before the measurement finished

        utime.sleep_ms(20)

        dataBuffer = bytearray(6)

        # read the measurement result

        self._i2cDev.read(dataBuffer)

        # print(dataBuffer)

        # calculate real temperature and humidity according to SHT3X-DIS' data sheet

        temp = (dataBuffer[0]<<8) | dataBuffer[1]

        humi = (dataBuffer[3]<<8) | dataBuffer[4]

        tempHumidity[1] = humi * 0.0015259022

        tempHumidity[0] = -45.0 + (temp) * 175.0 / (0xFFFF - 1)

        return tempHumidity    def getTemperature(self):

        data = self.getTempHumidity()

        return data[0]

    def getHumidity(self):

        data = self.getTempHumidity()

        return data[1]

    def stop(self):

        if self._i2cDev is None:

            raise ValueError('invalid I2C object')

        # stop periodic data acquisition mode

        cmd = bytearray(3)

        cmd[0] = 0x30

        cmd[1] = 0x93

        self._i2cDev.write(cmd)

        # wait for a little while

        utime.sleep_ms(20)

        self._i2cDev = None

        return 0

    def __del__(self):

        print('sht3x __del__')if __name__ == '__main__':

    '''

    The below i2c configuration is needed in your board.json.

    'sht3x': {

        'type': 'I2C',

        'port': 1,

        'addrWidth': 7,

        'freq': 400000,

        'mode': 'master',

        'devAddr': 68

    },

    '''

    print('Testing sht3x ...')

    i2cDev = I2C()

    i2cDev.open('sht3x')

    sht3xDev = SHT3X(i2cDev)

    '''

    # future usage:

    i2cDev = I2C('sht3x')

    sht3xDev = sht3x.SHT3X(i2cDev)

    '''

    temperature = sht3xDev.getTemperature()

    print('The temperature is: %f' % temperature)

    humidity = sht3xDev.getHumidity()

    print('The humidity is: %f' % humidity)

    print('Test sht3x done!')

將程序代碼燒錄到開發(fā)板后，設(shè)備會(huì)聯(lián)網(wǎng)，并且每3秒上報(bào)一次數(shù)據(jù)。發(fā)布的數(shù)據(jù)， 我們可以在阿里云物聯(lián)網(wǎng)平臺(tái)上的設(shè)備的物模型數(shù)據(jù)中看到。

關(guān)于board.json的部分，需要根據(jù)自己采用的溫度/濕度傳感器，調(diào)整對應(yīng)的GPIO的編號(hào)就行。