There is a light non Technical Blog Post about this Topic here Blog Post
The following design goals must be met for this system:
- Waterproof: The device should be able to withstand various environmental conditions, including water exposure.
- Cost-Effective: Given the potential need for large quantities, the solution should aim to minimize costs without compromising functionality or reliability.
- Usable Headless & with a Phone: The device should be operable both independently (headless) and in conjunction with a phone, offering flexibility in its use.
The system will consist of the following components:
- Computing Module: Xiao ESP32S3 for processing and controlling the system.
- LoRaWAN Transmitter: Wio-SX1262 for long-range communication.
- Connector: SMA to I-pEX antenna connector for secure connection to the antenna.
- Antenna: Suitable for 868MHz LoRa communication. (EU)
- GPS Module: Initially considered L76K GNSS Module for XIAO, but open to alternatives that meet requirements and budget constraints.
- Compass Module: Not required as heading information is not necessary for this application.
- Battery Management: Needs to be defined, with 18650 batteries (3500 mAh) being a potential option.
- Form Factor / Waterproof Housing: Utilizing designs such as https://www.printables.com/model/971362-waterproof-capsule or 32 HT Pipe with End Caps for waterproofing and durability.
To evaluate the feasibility of self-building this system, a cost analysis has been conducted. The initial estimate includes:
| Component | Name | Price Each | Quantity | Total |
|---|---|---|---|---|
| Core | ESP32 S3 mit SX126 | ~9,89€ | 5x | 49,39€ |
| Battery | 18650 3500 mAh | 6x | 12,99€ | |
| Antenna | 915MHz LoRa Antenne | 6x | 21,54€ | |
| GPS | XIAO-L76K-GNSS-Board | 10,19€ | 5x | 50,95€ |
| Total | 26,97€ | 5x | 134,87€ |
Using a more affordable GPS module:
| Component | Name | Price Each | Quantity | Total |
|---|---|---|---|---|
| Core | ESP32 S3 mit SX126 | ~9,89€ | 5x | 49,39€ |
| Battery | 18650 3500 mAh | 6x | 12,99€ | |
| Antenna | 915MHz LoRa Antenne | 6x | 21,54€ | |
| GPS | GY-NEO6MV2 GPS-Modul | 2,69€ | 5x | 13,45€ |
| Total | 19,47€ | 5x | 97,37€ |
This analysis suggests that self-building the system could be a cost-effective approach, especially with careful selection of components to meet both functional and budgetary requirements.
To be done…
To be done…