COURSERA-DEVELOPER-IOT-PYTHON-SOLUTION

Getting started with the skeleton

The skeleton has some dependencies that should be installed with

pip install --user -r requirements.txt

How to use the SenseHAT Simulator

The SenseHAT simulator has two components, a web-based user interface to see pixel status and change temperature, and a web socket server that controls the UI.

The web socket server exposes a Python API that has the same interface as the real SenseHAT API for set_pixels and get_temperature. You can use it as a plug-in replacement in your code. The SenseHat simulator is located in sense_hat.py in this directory and it requires no further setup. The web socker server listens on port 9000.

The user interface is located in the public directory. In order to run the user interface, we use a web server to serve from this directory on port 8000. A very easy way to get this going is to run

python -m SimpleHTTPServer 8000

from the public directory. Any other tool that can start up a web server from the public directory works fine, too.

To access the user interface, go to http://localhost:8000 if you are working on the Pi directly. If you are connected via ssh, edit public/index.html and on line 257 replace localhost with the ip address of your Pi. If your Pi has 192.168.1.42, the line should read

    ws = new WebSocket('ws://192.168.1.42:9000/');

Then open a browser and go to http://192.168.1.42:8000.

How to use your SenseHAT device

If you have a SenseHAT device, just move the SenseHAT simulator, i.e. sense_hat.py in this directory to another location or delete it. Your Python code will then use the real SenseHAT APIs.

Built With

• html
• python