This repository contains the code for a project that aims to measure the sway of trees using a network of sensors.
There is 5 main components to this project:
The M-Node is placed on the tree trunk and branches to measure the sway of the tree and the oscillations of the branches.
We choosed to use a XIAO BLE Sense (nFR52840) for his very low power consumption, BLE capabilities, tiny form factor and built-in sensors (accelerometer and gyroscope).
The M-Node is powered by a battery pack, and communicate with the Main-Node using BLE.
It can be put to sleep or woken up by the Sleeper-Node when there is no wind to save power.
The M-Node is programmed using the Arduino IDE. The source code can be found in the nrf-sensor-server folder. The A-Node, M-Node and S-Node share the same source code. Define NODE_TYPE to M_NODE to compile the M-Node code.
For more information on how to use the M-Node, see the nrf-sensor-server/README.md file.
The A-Node is placed on the ground and is used to measure the wind speed and direction.
We also use a XIAO BLE Sense (nFR52840) for the same reasons as the M-Node.
The A-Node is programmed using the Arduino IDE. The source code can be found in the nrf-sensor-server folder. The A-Node, M-Node and S-Node share the same source code. Define NODE_TYPE to A_NODE to compile the A-Node code.
For more information on how to use the A-Node, see the nrf-sensor-server/README.md file.
The Sleeper-Node (also known as S-Node) is placed on the tree trunk and is used to wake up the M-Node when there is wind.
His role is to convert the sleep and wake up signal sent by the Main-Node through BLE to a digital signal that can be read by the M-Node. We have to use another microcontroller because the XIAO BLE Sense can't wake up from sleep using BLE.
The S-Node is programmed using the Arduino IDE. The source code can be found in the nrf-sensor-server folder. The A-Node, M-Node and S-Node share the same source code. Define NODE_TYPE to S_NODE to compile the S-Node code.
For more information on how to use the S-Node, see the nrf-sensor-server/README.md file.
The Main-Node is placed on the main board, on the ground. It is used to collect the data from the M-Node and A-Node. This is the central node of the network.
We use a esp32-s3 for his BLE and Wifi capabilities, and his low power consumption.
The Main-Node is connected through BLE to the M-Node and A-Node, and send the data to the Display-Node through Wifi. It also send the sleep and wake up signal to the Sleeper-Node.
To be able to monitor and the system, the Main-Node also send his data to the Display-Node through i2c.
The controls buttons placed on the main board are also connected to the Main-Node.
The Main-Node is programmed using ESP-IDF due to the lack of BLE support in the Arduino ESP32 framework. The source code can be found in the main-node folder.
The Wifi-Node is placed on the main board, on the ground. It is used to send the data collected by the Main-Node to the cloud, or write the data to a SD card. It is also the one that control the display.
We use a esp32-s3 for his Wifi capabilities, and his low power consumption.
The Main-Node is sending data to this node through i2c.
The Wifi-Node is programmed using ESP-IDF The source code can be found in the wifi-node folder.
- jansumsky: project manager, hardware decisions
- Tomas Baca: hardware conception
- franckg28: software developer & hardware testing
- max1lock: S-Node, researches and trials on i2c and wifi.
- leHofficiel: researches
- alxandre-r: researches