• 工程設計專題

溫度感測控制虛擬燈泡亮度

• 講義

• 樹莓派(Raspberry Pi)與溫度感測器(DHT11)

  • 樹莓派電路示意圖

  紅 VCC +3.3V
  黑 GND 接地
  綠 DATA 訊號 GPIO

  

  物聨網操作介面(以IoTtalk為例)

  • 新增一個虛擬燈泡(輸出裝置)

   

  

  

  

  • 新增一個樹莓派溫度感測器(輸入裝置)

  

  

  

  

  • 樹莓派(Raspberry Pi)與物聨網平台(IoTtalk)程式連結下載

  Dummy_Device_IoTtalk.zip

  • 請解壓縮後，選取「SA.py」修改程式。

  import random
  import Adafruit_DHT
  
  GPIO_PIN = 4
  
  ServerURL = '' #For example: 'https://DomainName'
  MQTT_broker = None # MQTT Broker address, for example: 'DomainName' or None = no MQTT support
  MQTT_port = 1883
  MQTT_encryption = False
  MQTT_User = 'ID'
  MQTT_PW = 'PW'
  
  device_model = 'Dummy_Device'
  IDF_list = ['Dummy_Sensor']
  ODF_list = ['Dummy_Control']
  device_id = None #if None, device_id = MAC address
  device_name = None
  exec_interval = 1  # IDF/ODF interval
  
  def Dummy_Sensor():
      DHT_SENSOR = Adafruit_DHT.DHT11
      humidity, temperature = Adafruit_DHT.read_retry(DHT_SENSOR, GPIO_PIN)
      if humidity is not None and temperature is not None :
          print("溫度={0:0.2f}度C 溼度={1:0.2f}%".format(temperature, humidity))
      else :
          print("讀取失敗, 重新讀取.")
      return temperature, humidity
  
  def Dummy_Control(data:list):
      pass
      # print(data[0])
                  
  def on_register(r):
      print(f'Device name: {r["d_name"]}')    
      '''
      #You can write some SA routine code here, for example: 
      import time, DAI
      while True:
          DAI.push('Dummy_Sensor', [100, 200])  
          time.sleep(exec_interval)

  開啟終端機程式，在Python所在的資料夾中，執行以下的指令：

  sudo python3 DAI.py

  連接物聨網裝置

  • 連結設備裝置與定義裝置間的函式。

  

  • Join 1 的函式(!nksh_temperature)

  def run(*args):
      return args[0] * 1.5