Remove compile-time variables and revamp readme.md
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albarlow
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@ -1,38 +1,60 @@
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Hello! I have written a v2 usermod for the BME280/BMP280 sensor based on the [existing v1 usermod](https://github.com/Aircoookie/WLED/blob/master/usermods/Wemos_D1_mini%2BWemos32_mini_shield/usermod_bme280.cpp). It is not just a refactor, there are many changes which I made to fit my use case, and I hope they will fit the use cases of others as well! Most notably, this usermod is *just* for the BME280 and does not control a display like in the v1 usermod designed for the WeMos shield.
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# Usermod BME280
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This Usermod is designed to read a `BME280` or `BMP280` sensor and output the following:
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- Temperature
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- Humidity (`BME280` only)
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- Pressure
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- Heat Index (`BME280` only)
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- Dew Point (`BME280` only)
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- Requires libraries `BME280@~3.0.0` (by [finitespace](https://github.com/finitespace/BME280)) and `Wire`. Please add these under `lib_deps` in your `platform.ini` (or `platform_override.ini`).
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- Data is published over MQTT so make sure you've enabled the MQTT sync interface.
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Configuration is all completed via the Usermod menu. There are no settings to set in code! The following settings can be configured in the Usermod Menu (remember to reboot for any changes made here to take effect):
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- Temperature Decimals (number of decimal places to output)
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- Humidity Decimals
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- Pressure Decimals
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- Temperature Interval (how many seconds between reads of temperature and humidity)
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- Pressure Interval
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- Publish Always (turn off to only publish changes, on to publish whether or not value changed)
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- Use Celsius (turn off to use Farenheit)
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- Home Assistant Discovery (turn on to sent MQTT Discovery entries for Home Assistant)
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- SDA/SCL GPIO Pins
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Dependencies
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- Libraries
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- `BME280@~3.0.0` (by [finitespace](https://github.com/finitespace/BME280))
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- `Wire`
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- These must be added under `lib_deps` in your `platform.ini` (or `platform_override.ini`).
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- Data is published over MQTT - make sure you've enabled the MQTT sync interface.
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- This usermod also writes to serial (GPIO1 on ESP8266). Please make sure nothing else listening on the serial TX pin of your board will get confused by log messages!
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To enable, compile with `USERMOD_BME280` defined (i.e. `platformio_override.ini`)
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In addition to outputting via MQTT, you can read the values from the Info Screen on the dashboard page of the device's web interface.
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Methods also exist to read the read/calculated values from other WLED modules through code.
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- `getTemperatureC()`
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- `getTemperatureF()`
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- `getHumidity()`
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- `getPressure()`
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- `getDewPointC()`
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- `getDewPointF()`
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- `getHeatIndexC()`
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- `getHeatIndexF()`
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# Complilation
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To enable, compile with `USERMOD_BME280` defined (e.g. in `platformio_override.ini`)
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```ini
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[env:usermod_bme280_d1_mini]
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extends = env:d1_mini
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build_flags =
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${common.build_flags_esp8266}
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-D USERMOD_BME280
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```
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or define `USERMOD_BME280` in `my_config.h`
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```c++
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#define USERMOD_BME280
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lib_deps =
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${esp8266.lib_deps}
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BME280@~3.0.0
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Wire
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```
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If you are using Home Assistant, there is an option to create a discoverable device with sensors for Pressure, Humidity, Temperature, Dew Point and Heat Index. This can be disabled if required.
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Changes include:
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- Adjustable measure intervals
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- Temperature and pressure have separate intervals due to pressure not frequently changing at any constant altitude
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- Adjustment of number of decimal places in published sensor values
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- Separate adjustment for temperature, humidity and pressure values
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- Values are rounded to the specified number of decimal places
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- Pressure measured in units of hPa instead of Pa
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- Calculation of heat index (apparent temperature) and dew point
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- These, along with humidity measurements, are disabled if the sensor is a BMP280
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- 16x oversampling of sensor during measurement
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- Values are only published if they are different from the previous value
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- Values are published on startup (continually until the MQTT broker acknowledges a successful publication)
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Adjustments are made through preprocessor definitions at the start of the class definition.
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MQTT topics are as follows:
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# MQTT
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MQTT topics are as follows (`<deviceTopic>` is set in MQTT section of Sync Setup menu):
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Measurement type | MQTT topic
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--- | ---
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Temperature | `<deviceTopic>/temperature`
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@ -40,3 +62,5 @@ Humidity | `<deviceTopic>/humidity`
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Pressure | `<deviceTopic>/pressure`
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Heat index | `<deviceTopic>/heat_index`
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Dew point | `<deviceTopic>/dew_point`
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If you are using Home Assistant, and `Home Assistant Discovery` is turned on, Home Assistant should automatically detect a new device, provided you have the MQTT integration installed. The device is seperate from the main WLED device and will contain sensors for Pressure, Humidity, Temperature, Dew Point and Heat Index.
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@ -12,24 +12,28 @@
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class UsermodBME280 : public Usermod
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{
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private:
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// User-defined configuration
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#define Celsius // Show temperature mesaurement in Celcius. Comment out for Fahrenheit
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unsigned long TemperatureDecimals = 0; // Number of decimal places in published temperaure values
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unsigned long HumidityDecimals = 0; // Number of decimal places in published humidity values
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unsigned long PressureDecimals = 0; // Number of decimal places in published pressure values
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unsigned long TemperatureInterval = 5; // Interval to measure temperature (and humidity, dew point if available) in seconds
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unsigned long PressureInterval = 300; // Interval to measure pressure in seconds
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bool PublishAlways = false; // Publish values even when they have not changed
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bool HomeAssistantDiscovery = false; // Publish Home Assistant Device Information
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#ifdef ARDUINO_ARCH_ESP32 // ESP32 boards
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// NOTE: Do not implement any compile-time variables, anything the user needs to configure
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// should be configurable from the Usermod menu using the methods below
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// key settings set via usermod menu
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unsigned long TemperatureDecimals = 0; // Number of decimal places in published temperaure values
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unsigned long HumidityDecimals = 0; // Number of decimal places in published humidity values
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unsigned long PressureDecimals = 0; // Number of decimal places in published pressure values
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unsigned long TemperatureInterval = 5; // Interval to measure temperature (and humidity, dew point if available) in seconds
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unsigned long PressureInterval = 300; // Interval to measure pressure in seconds
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bool PublishAlways = false; // Publish values even when they have not changed
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bool UseCelsius = true; // Use Celsius for Reporting
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bool HomeAssistantDiscovery = false; // Publish Home Assistant Device Information
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// set the default pins based on the architecture, these get overridden by Usermod menu settings
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#ifdef ARDUINO_ARCH_ESP32 // ESP32 boards
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uint8_t SCL_PIN = 22;
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uint8_t SDA_PIN = 21;
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#else // ESP8266 boards
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#else // ESP8266 boards
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uint8_t SCL_PIN = 5;
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uint8_t SDA_PIN = 4;
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//uint8_t RST_PIN = 16; // Uncoment for Heltec WiFi-Kit-8
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#endif
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#endif
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// BME280 sensor settings
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BME280I2C::Settings settings{
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@ -59,6 +63,7 @@ bool HomeAssistantDiscovery = false; // Publish Home Assistant Device Inform
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float sensorHeatIndex;
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float sensorDewPoint;
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float sensorPressure;
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String tempScale;
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// Track previous sensor values
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float lastTemperature;
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float lastHumidity;
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@ -78,16 +83,14 @@ bool HomeAssistantDiscovery = false; // Publish Home Assistant Device Inform
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uint16_t mqttTemperaturePub = 0;
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uint16_t mqttPressurePub = 0;
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// Read the BME280/BMP280 Sensor (which one runs depends on whether Celsius or Farenheit being set in Usermod Menu)
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void UpdateBME280Data(int SensorType)
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{
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float _temperature, _humidity, _pressure;
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#ifdef Celsius
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if (UseCelsius) {
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BME280::TempUnit tempUnit(BME280::TempUnit_Celsius);
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EnvironmentCalculations::TempUnit envTempUnit(EnvironmentCalculations::TempUnit_Celsius);
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#else
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BME280::TempUnit tempUnit(BME280::TempUnit_Fahrenheit);
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EnvironmentCalculations::TempUnit envTempUnit(EnvironmentCalculations::TempUnit_Fahrenheit);
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#endif
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BME280::PresUnit presUnit(BME280::PresUnit_hPa);
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bme.read(_pressure, _temperature, _humidity, tempUnit, presUnit);
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@ -95,14 +98,32 @@ bool HomeAssistantDiscovery = false; // Publish Home Assistant Device Inform
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sensorTemperature = _temperature;
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sensorHumidity = _humidity;
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sensorPressure = _pressure;
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tempScale = "°C";
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if (sensorType == 1)
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{
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sensorHeatIndex = EnvironmentCalculations::HeatIndex(_temperature, _humidity, envTempUnit);
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sensorDewPoint = EnvironmentCalculations::DewPoint(_temperature, _humidity, envTempUnit);
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}
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} else {
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BME280::TempUnit tempUnit(BME280::TempUnit_Fahrenheit);
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EnvironmentCalculations::TempUnit envTempUnit(EnvironmentCalculations::TempUnit_Fahrenheit);
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BME280::PresUnit presUnit(BME280::PresUnit_hPa);
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bme.read(_pressure, _temperature, _humidity, tempUnit, presUnit);
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sensorTemperature = _temperature;
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sensorHumidity = _humidity;
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sensorPressure = _pressure;
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tempScale = "°F";
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if (sensorType == 1)
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{
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sensorHeatIndex = EnvironmentCalculations::HeatIndex(_temperature, _humidity, envTempUnit);
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sensorDewPoint = EnvironmentCalculations::DewPoint(_temperature, _humidity, envTempUnit);
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}
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}
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}
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// Procedure to define all MQTT Topics
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// Procedure to define all MQTT discovery Topics
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void _mqttInitialize()
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{
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mqttTemperatureTopic = String(mqttDeviceTopic) + "/temperature";
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@ -111,25 +132,15 @@ bool HomeAssistantDiscovery = false; // Publish Home Assistant Device Inform
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mqttHeatIndexTopic = String(mqttDeviceTopic) + "/heat_index";
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mqttDewPointTopic = String(mqttDeviceTopic) + "/dew_point";
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if (HomeAssistantDiscovery) {
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String t = String("homeassistant/sensor/") + mqttClientID + "/temperature/config";
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#ifdef Celsius
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_createMqttSensor("Temperature", mqttTemperatureTopic, "temperature", "°C");
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#else
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_createMqttSensor("Temperature", mqttTemperatureTopic, "temperature", "°F");
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#endif
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_createMqttSensor("Temperature", mqttTemperatureTopic, "temperature", tempScale);
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_createMqttSensor("Pressure", mqttPressureTopic, "pressure", "hPa");
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_createMqttSensor("Humidity", mqttHumidityTopic, "humidity", "%");
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#ifdef Celsius
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_createMqttSensor("HeatIndex", mqttHeatIndexTopic, "temperature", "°C");
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#else
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_createMqttSensor("HeatIndex", mqttHeatIndexTopic, "temperature", "°F");
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#endif
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#ifdef Celsius
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_createMqttSensor("DewPoint", mqttDewPointTopic, "temperature", "°C");
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#else
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_createMqttSensor("DewPoint", mqttDewPointTopic, "temperature", "°F");
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#endif
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_createMqttSensor("HeatIndex", mqttHeatIndexTopic, "temperature", tempScale);
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_createMqttSensor("DewPoint", mqttDewPointTopic, "temperature", tempScale);
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}
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}
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// Create an MQTT Sensor for Home Assistant Discovery purposes, this includes a pointer to the topic that is published to in the Loop.
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@ -210,7 +221,7 @@ public:
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float temperature = roundf(sensorTemperature * pow(10, TemperatureDecimals)) / pow(10, TemperatureDecimals);
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float humidity, heatIndex, dewPoint;
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if (WLED_MQTT_CONNECTED && !mqttInitialized && HomeAssistantDiscovery)
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if (WLED_MQTT_CONNECTED && !mqttInitialized)
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{
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_mqttInitialize();
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mqttInitialized = true;
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@ -277,19 +288,19 @@ public:
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* API calls te enable data exchange between WLED modules
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*/
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inline float getTemperatureC() {
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#ifdef Celsius
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if (UseCelsius) {
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return (float)roundf(sensorTemperature * pow(10, TemperatureDecimals)) / pow(10, TemperatureDecimals);
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#else
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} else {
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return (float)roundf(sensorTemperature * pow(10, TemperatureDecimals)) / pow(10, TemperatureDecimals) * 1.8f + 32;
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#endif
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}
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}
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inline float getTemperatureF() {
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#ifdef Celsius
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if (UseCelsius) {
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return ((float)roundf(sensorTemperature * pow(10, TemperatureDecimals)) / pow(10, TemperatureDecimals) -32) * 0.56f;
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#else
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} else {
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return (float)roundf(sensorTemperature * pow(10, TemperatureDecimals)) / pow(10, TemperatureDecimals);
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#endif
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}
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}
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inline float getHumidity() {
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return (float)roundf(sensorHumidity * pow(10, HumidityDecimals));
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@ -297,11 +308,32 @@ public:
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inline float getPressure() {
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return (float)roundf(sensorPressure * pow(10, PressureDecimals));
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}
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inline float getDewPoint() {
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inline float getDewPointC() {
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if (UseCelsius) {
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return (float)roundf(sensorDewPoint * pow(10, TemperatureDecimals)) / pow(10, TemperatureDecimals);
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} else {
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return (float)roundf(sensorDewPoint * pow(10, TemperatureDecimals)) / pow(10, TemperatureDecimals) * 1.8f + 32;
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}
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}
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inline float getDewPointF() {
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if (UseCelsius) {
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return ((float)roundf(sensorDewPoint * pow(10, TemperatureDecimals)) / pow(10, TemperatureDecimals) -32) * 0.56f;
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} else {
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return (float)roundf(sensorDewPoint * pow(10, TemperatureDecimals)) / pow(10, TemperatureDecimals);
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}
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inline float getHeatIndex() {
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}
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inline float getHeatIndexC() {
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if (UseCelsius) {
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return (float)roundf(sensorHeatIndex * pow(10, TemperatureDecimals)) / pow(10, TemperatureDecimals);
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} else {
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return (float)roundf(sensorHeatIndex * pow(10, TemperatureDecimals)) / pow(10, TemperatureDecimals) * 1.8f + 32;
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}
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}inline float getHeatIndexF() {
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if (UseCelsius) {
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return ((float)roundf(sensorHeatIndex * pow(10, TemperatureDecimals)) / pow(10, TemperatureDecimals) -32) * 0.56f;
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} else {
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return (float)roundf(sensorHeatIndex * pow(10, TemperatureDecimals)) / pow(10, TemperatureDecimals);
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}
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}
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// Publish Sensor Information to Info Page
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@ -322,7 +354,7 @@ public:
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JsonArray temperature_json = user.createNestedArray("Temperature");
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JsonArray pressure_json = user.createNestedArray("Pressure");
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temperature_json.add(roundf(sensorTemperature * pow(10, TemperatureDecimals)));
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temperature_json.add(F("°C"));
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temperature_json.add(tempScale);
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pressure_json.add(roundf(sensorPressure * pow(10, PressureDecimals)));
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pressure_json.add(F("hPa"));
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}
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@ -334,27 +366,15 @@ public:
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JsonArray heatindex_json = user.createNestedArray("Heat Index");
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JsonArray dewpoint_json = user.createNestedArray("Dew Point");
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temperature_json.add(roundf(sensorTemperature * pow(10, TemperatureDecimals)) / pow(10, TemperatureDecimals));
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#ifdef Celsius
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temperature_json.add(F("°C"));
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#else
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temperature_json.add(F("°F"));
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#endif
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temperature_json.add(tempScale);
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humidity_json.add(roundf(sensorHumidity * pow(10, HumidityDecimals)));
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humidity_json.add(F("%"));
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pressure_json.add(roundf(sensorPressure * pow(10, PressureDecimals)));
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pressure_json.add(F("hPa"));
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heatindex_json.add(roundf(sensorHeatIndex * pow(10, TemperatureDecimals)) / pow(10, TemperatureDecimals));
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#ifdef Celsius
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heatindex_json.add(F("°C"));
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#else
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heatindex_json.add(F("°F"));
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#endif
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heatindex_json.add(tempScale);
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dewpoint_json.add(roundf(sensorDewPoint * pow(10, TemperatureDecimals)) / pow(10, TemperatureDecimals));
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#ifdef Celsius
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dewpoint_json.add(F("°C"));
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#else
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dewpoint_json.add(F("°F"));
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#endif
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dewpoint_json.add(tempScale);
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}
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return;
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}
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@ -367,7 +387,9 @@ public:
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top["HumidityDecimals"] = HumidityDecimals;
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top["PressureDecimals"] = PressureDecimals;
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top["TemperatureInterval"] = TemperatureInterval;
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top["PressureInterval"] = PressureInterval;
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top["PublishAlways"] = PublishAlways;
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top["UseCelsius"] = UseCelsius;
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top["HomeAssistantDiscovery"] = HomeAssistantDiscovery;
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JsonArray pinArray = top.createNestedArray("pin-sda-scl");
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pinArray.add(SDA_PIN);
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@ -389,7 +411,9 @@ public:
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configComplete &= getJsonValue(top["HumidityDecimals"], HumidityDecimals, 0);
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configComplete &= getJsonValue(top["PressureDecimals"], PressureDecimals, 0);
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configComplete &= getJsonValue(top["TemperatureInterval"], TemperatureInterval, 30);
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configComplete &= getJsonValue(top["PressureInterval"], PressureInterval, 30);
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configComplete &= getJsonValue(top["PublishAlways"], PublishAlways, false);
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configComplete &= getJsonValue(top["UseCelsius"], UseCelsius, true);
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configComplete &= getJsonValue(top["HomeAssistantDiscovery"], HomeAssistantDiscovery, false);
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configComplete &= getJsonValue(top["pin-sda-scl"][0], SDA_PIN, 21); //SDA
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configComplete &= getJsonValue(top["pin-sda-scl"][1], SCL_PIN, 22); //SCL
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