Thermometer: The GUI/Web Real-time Serial Port Monitor of DHT11

These projects introduce some concepts and technologies to build robust and reliable monitoring software of serial port devices in the easy way.

Hardware

• Board: Arduino UNO

• Sensor: DHT11

Layout: Arduino UNO + DHT11

  Connect DHT11 pin 1(VCC,left,power)   ->  Arduino +5V

  Connect DHT11 pin 2(DATA,signal)      ->  your DHTPIN in Arduino UNO,for example pin 3

  Connect DHT11 pin 4(GND,right)        ->  Arduino GROUND

  Connect DHT11 pin 2(DATA,signal)      -> a 10K resistor  ->  DHT11 pin 1 (VCC) 

Arduino sketch

• Open ArduinoDHTSensor.ino, build and upload to Arduino

Python and Packages

• Python3.5

• PyQt4, PySerial, PythonQwt, Tornado

PyQt4 Package

• Goto Unofficial Windows Binaries for Python Extension Packages page

• Download the suitable release (distributed as a “wheel” archive) series that matches your Windows and Python versione. In the filename, the digits after “cp” indicate the Python version, e.g.

https://www.lfd.uci.edu/~gohlke/pythonlibs/#pyqt4

 PyQt4-4.11.4-cp35-cp35m-win_amd64.whl 

is the installer of PyQt4-4.11.4 for 64-bit Python 3.5 and windows.

• From an administrative command prompt, install the downloaded wheel using pip.

  >pip install  PyQt4-4.11.4-cp35-cp35m-win_amd64.whl

PyQtArduinoDHT11

• A threaded GUI Monitor with Python and PyQt4 plots live data using PythonQwt

• Packages：Python3.5,PyQt4, PySerial, PythonQwt, Thread

• Launching the app

    >python DHT_monitor_app.py

• The GUI application is modified from: mba7 https://github.com/mba7/SerialPort-RealTime-Data-Plotter,

TornadoArduinoDHT11

• A web monitor with Tornado web server enables real-time plotting of DHT11 signals in the browser(support websocket)

• Key Points： tornado server + websocket + flotr2

• Enjoying live data on COM4

  • if your board serial port is not COM4, you may change:

      def openSerial():
          
          port = 'COM4'  # you shoule change to your board serial port

  1) Launching the web server

      >python app.py

  2) Open a web browser and go to :

   http://localhost:8000  

  You should see the graph and be able to select the curves to display.

Reference

• Arduino

  • Arduino: http://www.arduino.cc/

  • Wiring: http://wiring.org.co/

  • DHT11：http://playground.arduino.cc/Main/DHT11Lib

  • Arduino and Python: http://playground.arduino.cc/Interfacing/Python

• Python

  • PyQt: https://riverbankcomputing.com/software/pyqt/intro

  • PythonQwt： https://github.com/PierreRaybaut/PythonQwt

  • Tornado Web Server: http://www.tornadoweb.org/en/stable/

  • Noah Gift. Practical threaded programming with Python. http://www.ibm.com/developerworks/aix/library/au-threadingpython/index.html

License

MIT