WLED/usermods/Si7021_MQTT_HA/readme.md

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# Si7021 to MQTT (with Home Assistant Auto Discovery) usermod
This usermod implements support for [Si7021 I²C temperature and humidity sensors](https://www.silabs.com/documents/public/data-sheets/Si7021-A20.pdf).
As of this writing, the sensor data will *not* be shown on the WLED UI, but it _is_ published via MQTT to WLED's "built-in" MQTT device topic.
```
temperature: $mqttDeviceTopic/si7021_temperature
humidity: $mqttDeviceTopic/si7021_humidity
```
The following sensors can also be published:
```
heat_index: $mqttDeviceTopic/si7021_heat_index
dew_point: $mqttDeviceTopic/si7021_dew_point
absolute_humidity: $mqttDeviceTopic/si7021_absolute_humidity
```
Sensor data will be updated/sent every 60 seconds.
This usermod also supports Home Assistant Auto Discovery.
## Settings via Usermod Setup
- `enabled`: Enables this usermod
- `Send Dew Point, Abs. Humidity and Heat Index`: Enables additional sensors
- `Home Assistant MQTT Auto-Discovery`: Enables Home Assistant Auto Discovery
# Installation
## Hardware
Attach the Si7021 sensor to the I²C interface.
Default PINs ESP32:
```
SCL_PIN = 22;
SDA_PIN = 21;
```
Default PINs ESP8266:
```
SCL_PIN = 5;
SDA_PIN = 4;
```
## Software
Add to `build_flags` in platformio.ini:
```
-D USERMOD_SI7021_MQTT_HA
```
Add to `lib_deps` in platformio.ini:
```
adafruit/Adafruit Si7021 Library @ 1.4.0
BME280@~3.0.0
```
# Credits
- Aircoookie for making WLED
- Other usermod creators for example code (`sensors_to_mqtt` and `multi_relay` especially)
- You, for reading this