Follow the evolution of La Croix-Verte

La Croix-Verte is an area under renaturation located on the Rennes 1 campus, between the university library and the new metro line. Its renaturation is a commitment of Rennes Metropole in connection with the creation of the metro line B, in order to compensate for the destruction of other green spaces in the city. It is composed of 3 water points fed by an underground river and its objective is to promote biodiversity.
It is in this context that the Mycelium project was born. Its purpose is to monitor withe meteorological sensors the evolution of this area in transition, so by definition, unstable. These sensors are placed in a little box we call SoLo node.

Multidisciplinary project

Mycelium is supported by a multidisciplinary team. It includes experts in geosciences and computer science.
The node equipped with sensors (SoLo node) is provided by Mr. Laurant Royer, microelectronics research engineer at the Physics Laboratory of Clermont, and Mr. Maxime Rubéo Lisa who contributed to the development of the software part of the node.
Mr. Laurent Longuevergne, research director at Geosciences Rennes, and Mr. Nicolas Lavenant, study engineer at Geosciences Rennes, are involved in this project as experts in environmental studies. They are therefore interested and concerned by the implementation of software tools in La Croix-Verte.
Mr. Guillaume Pierre, professor at the Rennes 1 University, head of the research team Myriads at INRIA, intervenes on technical aspects related to the system set up for environmental monitoring.

INSA Rennes

The supervisors:
Christian RAYMOND
The students:
Guillaume CHAUVEAU
Florian DABAT
Élodie JUVÉ
Yifan TIAN
Haoying ZHANG

Physics Laboratory of Clermont

Laurent ROYER

Rennes 1 University

Nicolas Lavenant
Laurent Longuevergne
Guillaume Pierre

Where are our devices located ?
And how do they communicate ?

We have at our disposal a SoLo node, a LoRaWAN gateway and a cluster of five Raspberry Pis.
The SoLo node is placed in La Croix-Verte and will remain active to take environmental measures. Then, it sends data to the gateway via LoRaWAN, with a configured frequency.
The gateway and the cluster are located in the Computer Sciences building at INSA Rennes where the gateway transmits data to be managed by the cluster via Ethernet.
The Raspberry Pis in the cluster communicate with each other via Ethernet and with the outside world via WIFI network.

Mycelium Scenarios

To configure the SoLo node in order to be more autonomous and to process the data that we receive on the Raspberry Pis cluster, a few scenarios have been established. They correspond to typical meteorological situations we can face in Brittany, and which need particular attention.

There is for now about ten scenarios : snow, extreme temperatures, abnormal temperatures, abnormal rains, theft ...

Their purpose is to alert the administrator about the extreme meteorological situations, to protect the equipment when needed, but also to inform if anomalies have been detected in the data collected by the SoLo node after comparing them with those available on the Internet.

Mycelium Features


In the face of some abnormal situations, the smart node knows how to react; the system will also send notifications to the administrators automatically


The system is based on the Kubernetes orchestraror, bringing protability and scalability


Using Grafana and InfluxDB, data can be visualized in an universal, fast, and effective way