EMS Line Controller DLR 🌡️📈

Environmental sensor collection and IEEE 738 dynamic line rating calculations

Pre-requisites

• python 3.13+
• Raspberry Pi

Sensors

Sensor	Interface	Purpose	Data Type
FLIR Lepton	SPI	Conductor temperature	Thermal imaging
DHT22	GPIO	Ambient temp/humidity	Digital
SI1145	I2C	Solar radiation	UV/Visible/IR
YL-83	ADC	Rain detection	Analog

Core Algorithm

Dynamic rating calculation using IEEE 738 standard:

$$ P_{max} = \frac{(T_{max} - T_{amb} - ΔT_{solar} + ΔT_{rain})}{R_{thermal}} $$

Where:

• Conductor max temp (80°C): $T_{max}$
• DHT22 reading: $T_{amb}$
• SI1145 radiation factor: $ΔT_{solar}$
• YL-83 cooling coefficient: $ΔT_{rain}$
• FLIR Lepton thermal resistance: $R_{thermal} = \frac{(T_{conductor} - T_{ambient})}{P_{current}}$

MQTT Topics Published

• sites/{site_id}/devices/dlr_sensor/measurements/celsius/{temp}
• sites/{site_id}/devices/dlr_sensor/measurements/percent/{humidity}
• sites/{site_id}/devices/dlr_sensor/measurements/watts_per_m2/{solar}
• sites/{site_id}/devices/dlr_sensor/measurements/boolean/{rain}
• sites/{site_id}/devices/dlr_sensor/calculations/amps/{dynamic_rating}

Project Structure

├── pyproject.toml           # Dependencies and build config
├── src/
│   ├── main.py              # Application entry point
│   ├── sensors/             # Sensor driver modules
│   ├── __init__.py
│   ├── thermal_camera/
│   │   ├── thermal_camera_client_test.py
│   │   ├── thermal_camera_client.py
│   │   ├── thermal_camera_driver.py
│   │   └── __init__.py
│   ├── temp_humidity_sensor/
│   │   ├── temp_humidity_sensor_client_test.py
│   │   ├── temp_humidity_sensor_client.py
│   │   ├── temp_humidity_sensor_driver.py
│   │   └── __init__.py
│   ├── uv_light_sensor/
│   │   ├── uv_light_sensor_client_test.py
│   │   ├── uv_light_sensor_client.py
│   │   ├── uv_light_sensor_driver.py
│   │   └── __init__.py
│   ├── rain_sensor/
│   │   ├── rain_sensor_client_test.py
│   │   ├── rain_sensor_client.py
│   │   ├── rain_sensor_driver.py
│   │   └── __init__.py
│   ├── ieee738.py           # IEEE 738 calculation engine
│   ├── ieee738_test.py      # Algorithm unit tests
│   ├── mqtt_client.py       # MQTT publisher
│   ├── mqtt_client_test.py  # MQTT client tests
│   └── config.py            # Configuration management
├── tests/
│   └── test_integration.py  # End-to-end integration tests
└── README.md                # This file

Usage

uv run python src/main.py