Radioactivity data from Madrid in real time


Written by Mariete

Jan 24, 2017

Updated: May 21, 2020 @ 14:46

Data of Beta and Gamma Radiation in Madrid in Real Time

Yes, the graph that you can see below, except for unexpected problems, has been generated right now, in real time. Look at the hours.

[wpdatachart id = 1]

There is a web page where you can see various graphics. can you see her clicking here.

Next I will tell you how the detector works.


After having my detector Geiger finished and working, the next step is to send this radioactivity information to the network. The circumstance also occurs that I have not been able to find a single Madrid station on the internet sending beta / gamma radiation data in real time, so this may be the first station in Madrid to send this type of data (and I'm excited, because look how difficult it is to be the first on the internet today :-))

The Geiger meter I have built has a serial port through which the detected radiation data is transmitted every 15 seconds. This has made things much easier, since all I have had to do is provide it with "something" to read them and send them to my home automation system and the network.


As on other occasions, I have resorted to a NodeMCU with the ESPEASY firmware. This time there was no ESPEASY plugin to read the serial output of my Geiger counter but it was not very difficult to adapt another plugin, already existing, to read them.

EspEasy Geiger Counter
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The new device reads the serial output of the Geiger counter, processes it to extract the specific data from Pulses Per Minute and sends this data through MQTT to my broker.


Send Radmon with Node-Red

A node in Nore-Red receives the radioactivity data sent by the device and forwards it to is a site where hundreds of volunteers around the world send, in real time, the data obtained by their detectors to facilitate their visualization, generation of graphics, etc.

Datos de radiactividad de Madrid en tiempo real - 2
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The "Build Radmon url" function is very simple and simply builds a url, following the Radmon API specifications with my username, password and the latest measure.

Datos de radiactividad de Madrid en tiempo real - 3
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Saving data in InfluxDB

Another Node-Red node inserts the data into an InfluxDB database, which allows me to later create graphs of this data in Grafana.


  1. Javier

    Hello, I have seen this entry when doing a search for people who are taking radioactivity data, I am interested in the subject and I am surprised that I have not found more people

    • Mariete

      Hi Javier.

      Indeed, it is surprising to see how little information of this type is on the internet.

      At the moment there is a small problem with the page that shows the radioactivity data in real time but I hope that it is resolved shortly and that it will be displayed again in Ionizing radiation in Madrid in real time.

  2. Michal


    Great work by the way,
    I've been trying to create a similiar sensor, but I have a problem with adapting ESPEasy plugin.
    I have tried a to modify pulse counter, but without any success. Could you please share more information your solution for this?

    • Mariete

      Hello Michal.

      Thank you very much for your comment.

      You don't have to modify the pulse counter. Just connect his serial port to the ESP8266's serial port.

      I'm willing to expand the post, or create a new one, to explain in more detail the process. Please tell me what are you having problems with if I know what to focus on.


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