This project is a website compatible with gq GMC-320+v5 wifi geiger counter. It stores the measurement pushed by the counter in a postgres db, forwards each measurement to the http://gmcmap.com website and exposes a dashboard.
The gmc-320 is a wifi enabled geiger counter which can produce measurements every minute. The following data are produced:
- CPM : Counts per minute of the geiger counter
- ACPM: Averaged CPM
- usV: value in uSv/h (beware that the device is not energy compensated)
See the documentation from gq and Wikipedia
For you GMC-320 device to work with an instance of this webservice you will need to modify the Website and URL as described in the documentation - Read it !.
In my case i have set:
Website: geiger.tocardise.eu
URL: upload
This will make the device produce HTTP GET requests like this http://geiger.tocardise.eu/upload?AID=0230111&GID=0034021&CPM=15&ACPM=13.2&uSV=0.075
Please note that trying to make this request yourself should be forbidden by the IP filtering. If you find a vulnerability please tell me :-)
My instance of this website is running at http://geiger.tocardise.eu using Heroku free dynos, you can get the latest measurement here http://geiger.tocardise.eu/latest and the API doc here: http://geiger.tocardise.eu/docs
Sometimes I take my device for a trip so there is no data for a while.
It provides the following features:
- an HTTP endpoint for the GMC-320 to push data. data are optionaly forwarded to http://www.gmcmap.com
- a quick and dirty dask dashboard to see the last 24 hours of data
- an HTTP endpoint to download all data received so far
- an HTTP endpoint to retrieve the latest measurement (for real time monitoring)
It is also a technical playground to demonstrate several concepts:
- a simple webservice implemented using fastapi and tortoise-orm
- the integration in the fastapi app of a dash dashboard
- Streaming data out of a sql db using pandas and chunking.
- the deployment of the webservice using Heroku free dynos.
The diagram below shows the current architecture of the device, the ISP box and the cloud deployment.
Thanks to RealPython for their dash tutorial.
It is possible to run the webservice locally using the run.sh script. A python virtualenv
must be used with the requirements install like this (assuming pyenv is used):
Install pyenv using pyenv-installer first.
pyenv install 3.8.8
pyenv virtualenv 3.8.8 geigerenv
pyenv activate geigerenv
pip install -r requirements.txt
Now you can run the app.
./run.sh
INFO: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO: Started reloader process [18688] using statreload
INFO: Started server process [18728]
INFO: Waiting for application startup.
You can upload fake data to your local instance using this request:
curl "http://127.0.0.1:8000/upload?AID=0230111&GID=0034021&CPM=15&ACPM=13.2&uSV=0.075"
OK.ERR0
This repository has a Procfile and a runtime.txt file and is compatible with Heroku deployment.
Assuming you have created an Heroku account follow the steps below (replace geigerdemo by an app name of your choice):
curl https://cli-assets.heroku.com/install.sh | sh
heroku login
...
Logging in... done
Logged in as [email protected]
git clone https://github.com/colon3ltocard/pygeiger
cd pygeiger
heroku create geigerdemo
Creating ⬢ geigerdemo... done
https://geigerdemo.herokuapp.com/ | https://git.heroku.com/geigerdemo.git
git remote -v
heroku https://git.heroku.com/geigerdemo.git (fetch)
We now add a database to our app (using hobby-dev free plan)
heroku addons:create heroku-postgresql:hobby-dev
Creating heroku-postgresql:hobby-dev on ⬢ geigerdemo... free
Database has been created and is available
! This database is empty. If upgrading, you can transfer
! data from another database with pg:copy
Created postgresql-transparent-62251 as DATABASE_URL
Use heroku addons:docs heroku-postgresql to view documentation
We need to configure two env variables expected by the webservice. The first one is HOME_HOSTNAME and is used to identify the hostname from which data can be pushed (I find my home IP using a dyndns hostname).
heroku config:set HOME_HOSTNAME=YOUR_DYNDNS_HOSTNAME
The second variable is optional and used to activate data forwarding to http://gmcmap.com
heroku config:set FORWARD_TO_GMC=1
Finally we deploy the app.
git push heroku
Counting objects: 76, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (72/72), done.
Writing objects: 100% (76/76), 11.24 KiB | 1.02 MiB/s, done.
Total 76 (delta 40), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Building on the Heroku-20 stack
remote: -----> Python app detected
remote: -----> Installing python-3.8.8
remote: -----> Installing pip 20.1.1, setuptools 47.1.1 and wheel 0.34.2
....
....
remote: -----> Launching...
remote: Released v5
remote: https://geigerdemo.herokuapp.com/ deployed to Heroku
You can now browse to your app at https://geigerdemo.herokuapp.com/. (Replace geigerdemo by your app name)
You can check the app logs at anytime using:
heroku logs --tail
IMPORTANT SAVE YOUR FREE DYNO TIME don't forget to stop your app by scaling the web workers to 0.
heroku ps:scale web=0
Finally, you can destroy the app like this:
heroku apps:destroy
▸ WARNING: This will delete ⬢ geigerdemo including all add-ons.
▸ To proceed, type geigerdemo or re-run this command with --confirm geigerdemo
> geigerdemo
Destroying ⬢ geigerdemo (including all add-ons)... done
Copyright © 2021 Frank Guibert
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