Hello from a new station about 30 km east of Paris, France

Hi all,
The setup: Arduino Uno + Libelium Radiation Sensor Board + J305ß Geiger Tube. I bought that kit back in 2018.
Until recently it was a standalone setup in my office - so inside the building - and I was powering it up from time to time just to check that the readings looked "normal".

I then decided to feed my Home Assistant server with the data and while browsing the Internet looking for similar projects, I stumbled upon radmon.org.

Even though you can link an Arduino directly to Home Assistant, I decided to connect the Geiger kit via USB to a Raspberry Pi instead. The RPI acts as a gateway and connects to the LAN. Then the Home Assistant server (or in the future, a cluster of) can receive the data via ethernet using a MQTT broker.
The Raspberry Pi also sends the data to radmon.org every minute.
The device is up 24x7. Backup power is done by a UPS.

I can also share how I got "radiation" aware:
Back in 1986 - remember Chernobyl? - just realizing now it is almost 40 years to the date - I was a student and the physics teacher comes into the classroom with a Geiger counter a few days after the explosion.
Back then, the official line from the French government was that the contamination was minimum - if any - and that somehow the radioactive cloud had stopped at the French border.
Obviously this did not seem possible to the physics teacher, hence the Geiger counter.
Remember also: no Internet, no social medias, no alternative public source of information. Just the TV and the government line.
She tells us that on a normal day this device bips at the rate of a few clicks per minute. She turns it on and instantly there is a bip per second. We spent ages counting the bips, minute after minute, realizing that what we were told on TV was not right...
This is probably one of the reasons why I am now happy to contribute to radmon.org...
Cheers!

Welcome to the group. Even though the forum here is not very busy, interesting posts do appear regularly.

My electronic setup consists of a homemade radiation meter (thanks to PE1NSU) with an SMB20 tube. It is connected to a Raspberry Pi Zero that performs the calculations using a Python script, and the data is sent via a Bash script to radmon.org and gmcmap.com. I also publish the data on a VPS at https://rad.mentjens.nl/ , where a JavaScript script generates the graph.

My counter is mounted outside and placed in an airtight plastic box. This means that the vast majority of the counts I measure are gamma radiation. The tube can detect beta radiation, but beta particles have difficulty penetrating plastic. The main goal of my measurement setup is to observe changes over time. On average I measure around 15–16 CPM.

I still remember 1986 and the Chernobyl disaster very well. What has also always stayed with me is that during that period I had a newspaper delivery route. Shortly after the disaster, while the cloud was moving over north-western Europe, I was cycling through the rain delivering newspapers. In hindsight that probably wasn’t very smart, but at the time we simply didn’t know any better. If only I had had a Geiger counter back then…