Community-based Investigation of Cosmic Radiation

Cosmic radiation are high-energy particle rays produced in outer space which constantly impinge on the Earth's atmosphere. These particles can produce particle showers when they interact with atoms in the upper atmosphere.

The MuonPi Project aims at investigating these cosmic showers by establishing a network of low-cost Raspberry Pi-based particle detectors.

Active Users

Live Stations

Upcoming Stations


GB Total Data

Million Events Today


Thanks to many open-source online platforms we can share our data, documentation, hardware, and code with you!

Live Map

A map with live detector coincidences

Live Map


Data is important and Grafana is the perfect tool to display a multitude of live detector data



Extensive documentation about the project can be found in our Wiki



The Raspberry Pi shield and other drawings can be found in EasyEDA, an open source online design tool



All of our software is published on GitHub



A place to ask your questions


Join the Endeavour

While a single MuonPi detector already allows the investigation of cosmic ray muons, a wide-spanned network of the detector units can resolve the entire particle shower geometry and unveil the physics of cosmic radiation.

Are you interested in joining the MuonPi team?

Contact us

Latest News

New live map of coincidences

05 January 2021

The new live map shows all 'L1' coincidences between (two or more) active detector stations. The events are mostly random coincidences but could also come from a single cosmic showers. The more detectors in one event the more likely it is that it is a cosmic shower that was just detected.

Release of version 2.0.0 of the muondetector software

16 December 2020

Version 2.0.0 of the muondetector software has been released. Among other improvements, the software is now fully build with CMake instead of qmake.

Release of Cosmic Detector Unit 3.0

27 September 2020

Version 3.0 of our Cosmic Detector Unit (CDU) board has been release! Find out about it's new features and bugfixes...

Update: Revision 3.1 has been released and fixed some minor bugs. Board version 3.1 is working perfectly now.

Time resolution down to 50 ns achieved

25 April 2020

First time correlation measurements between two detector units reveal a time resolution down to 50 ns...