This project uses an Olimex ESP32-POE-ISO microcontroller running ESPHome to monitor Salt Tank levels from a HC-SR04 sensor. The device connects via Ethernet and exposes all readings natively to Home Assistant. An optional onboard web server allows viewing sensor values directly in a browser.
- Sensor Monitoring: Reads from a HC-SR04 sensor.
- Home Assistant Integration: Native API support for use in automations and dashboards.
- OTA Updates: Firmware can be updated via Home Assistant.
- Ethernet-Based: Uses ESP32 LAN8720 interface, no Wi-Fi stack required.
- Web Server: Optional local web interface on port 80 for raw sensor viewing.
- ESP32-POE-ISO: Main microcontroller with built-in Ethernet. Olimex ESP32-POE
- HC-SR04: Up to 4 digital temperature sensors. Link
| Component | Pin |
|---|---|
| Trigger Pin | GPIO13 |
| Echo Pin | GPIO14 |
| Ethernet MDC | GPIO23 |
| Ethernet MDIO | GPIO18 |
| Ethernet CLK | GPIO17 (OUT) |
| Ethernet Power | GPIO12 |
- Install Home Assistant with the ESPHome Add-on.
- Use the ESPHome dashboard to add a new device with the following configuration:
- Encryption Key
- OTA Key
- Flash via USB initially; future updates are handled OTA.
- Fork the repository.
- Create your feature branch (
git checkout -b feature/YourFeature). - Commit your changes (
git commit -am 'Add some feature'). - Push to the branch (
git push origin feature/YourFeature). - Create a new Pull Request.
This project is licensed under the MIT License. See the LICENSE file for details.
- Thanks to the developers of the libraries used in this project.
- Made this because I really needed to track my salt level in the salt tank.