This is a project that got awarded a 2nd place in a contest organised by a Polish company POL-EKO. Application running on ESP32 makes use of arduino-esp32 and PlatformIO. Web app is made using C#, making use of .NET 8 (latest version at the time of development) with Blazor as the UI solution and MariaDB as the database solution.
Manual in Polish is available here.
The ESP32 makes use of a proprietary weather probe. When it's connected to a wireless network, it can do 3 things:
- Announce itself in the network by sending UDP packets every given interval. The monitoring app then detects it and gives the user a possibility to monitor it.
- Establish a TCP connection with the monitoring app and periodically send measurements to it (there is a possibility to adjust the interval at which the data is sent).
- Send a single measurement over HTTP.
The device indicates its current network status with the LED positioned on the right side of the USB port and the red power LED. If it's illuminated, it means that the device is connected to a network. If it's not, it changes its network module operating mode to access point which allows the user to connect to it and connect to a network as well as adjust its network (like the IP address, subnet mask or default gateway) statically as well as change them back to default (make use of DHCP). The device automatically enters this mode when it's not connected to a network and hasn't got one saved in the memory or if it can't connect to a saved network. You can achieve the same by pressing the BOOT button on the device.
The monitoring app runs on a server. To use it, you're required to sign up. The first registered account receives a Super Admin role, which allows it to change other accounts' roles. Other roles are Admin and User. Admin can add new devices, change their settings within the app and stop monitoring. Users can only view current readings.
Devices are detected in the network thanks to periodically sent UDP packets. The application can also automatically detect changes in device's IP address if it uses DHCP or in general changes its IP address.
Application automatically detects error with the device or connection and displays them to the user in form of a warning in the bottom-right corner as well as red font on device's address on the sidebar.
Historical readings can be displayed in a form of a chart and a table, as well as downloaded to a .csv file.
