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Depends, this was a question I tried to answer for myself with this project. I did not easily find a good library for Python that would work on my Mac for read

Depends, this was a question I tried to answer for myself with this project. I did not easily find a good library for Python that would work on my Mac for reading the HID messages, so writing the device part in C++ was easier for me ( and an interesting excercise in c++17'ifying C code ). I thought about just having the c++ app be called from python, but wanted to try and see how hard it would be in c++ and found it extremely easy with the cpprestsdk.

andor 8y ago
Did you search for... "co2 meter python"? The pypi package called "CO2meter" (https://github.com/vfilimonov/co2meter https://github.com/vfilimonov/co2meter) not only works well as a library on Mac OS, but also comes with a web-based dashboard: $ pip install CO2meter flask pandas ... $ co2meter_server Edit: link
- stackmad 8y ago
  That looks great as well! But for some reason the library they use (pyhidapi) would always crash on my Mac.
- stackmad 8y ago
  Though with your steps it at least starts, but the webserver fails, and CTRL+C doesn't work ^^ * Serving Flask app "co2meter.server" (lazy loading) * Environment: production WARNING: Do not use the development server in a production environment. Use a production WSGI server instead. * Debug mode: off INFO:werkzeug: * Running on http://127.0.0.1:1201/ (Press CTRL+C to quit) ERROR:flask.app:Exception on / [GET] Traceback (most recent call last): File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 2292, in wsgi_app response = self.full_dispatch_request() File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 1815, in full_dispatch_request rv = self.handle_user_exception(e) File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 1718, in handle_user_exception reraise(exc_type, exc_value, tb) File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 1813, in full_dispatch_request rv = self.dispatch_request() File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 1799, in dispatch_request return self.view_functions[rule.endpoint](**req.view_args) File "/usr/local/lib/python2.7/site-packages/co2meter/server.py", line 64, in home data = read_logs() File "/usr/local/lib/python2.7/site-packages/co2meter/server.py", line 236, in read_logs with open(os.path.join('logs', name + '.csv'), 'r') as f: IOError: [Errno 2] No such file or directory: 'logs/co2.csv' INFO:werkzeug:127.0.0.1 - - [25/Jan/2019 14:18:23] "GET / HTTP/1.1" 500 - INFO:werkzeug:127.0.0.1 - - [25/Jan/2019 14:18:23] "GET /favicon.ico HTTP/1.1" 404 - ^C^C^C^C ^C^C
  - andor 8y ago
    co2meter_server writes measurements to "logs/co2.csv" in the current working directory every 30 seconds or so. As long as there is no measurement, you'll get this error from the web app trying to access the file. Just wait a minute and refresh the page.

andor 8y ago

Did you search for... "co2 meter python"? The pypi package called "CO2meter" (https://github.com/vfilimonov/co2meter https://github.com/vfilimonov/co2meter) not only works well as a library on Mac OS, but also comes with a web-based dashboard: $ pip install CO2meter flask pandas ... $ co2meter_server Edit: link

stackmad 8y ago
That looks great as well! But for some reason the library they use (pyhidapi) would always crash on my Mac.
stackmad 8y ago
Though with your steps it at least starts, but the webserver fails, and CTRL+C doesn't work ^^ * Serving Flask app "co2meter.server" (lazy loading) * Environment: production WARNING: Do not use the development server in a production environment. Use a production WSGI server instead. * Debug mode: off INFO:werkzeug: * Running on http://127.0.0.1:1201/ (Press CTRL+C to quit) ERROR:flask.app:Exception on / [GET] Traceback (most recent call last): File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 2292, in wsgi_app response = self.full_dispatch_request() File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 1815, in full_dispatch_request rv = self.handle_user_exception(e) File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 1718, in handle_user_exception reraise(exc_type, exc_value, tb) File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 1813, in full_dispatch_request rv = self.dispatch_request() File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 1799, in dispatch_request return self.view_functions[rule.endpoint](**req.view_args) File "/usr/local/lib/python2.7/site-packages/co2meter/server.py", line 64, in home data = read_logs() File "/usr/local/lib/python2.7/site-packages/co2meter/server.py", line 236, in read_logs with open(os.path.join('logs', name + '.csv'), 'r') as f: IOError: [Errno 2] No such file or directory: 'logs/co2.csv' INFO:werkzeug:127.0.0.1 - - [25/Jan/2019 14:18:23] "GET / HTTP/1.1" 500 - INFO:werkzeug:127.0.0.1 - - [25/Jan/2019 14:18:23] "GET /favicon.ico HTTP/1.1" 404 - ^C^C^C^C ^C^C
- andor 8y ago
  co2meter_server writes measurements to "logs/co2.csv" in the current working directory every 30 seconds or so. As long as there is no measurement, you'll get this error from the web app trying to access the file. Just wait a minute and refresh the page.