Add changeable i2c address to BME280 usermod

usermods/BME280_v2/README.md

@@ -7,6 +7,7 @@ This Usermod is designed to read a `BME280` or `BMP280` sensor and output the fo
 - Dew Point (`BME280` only)
 
 Configuration is performed via the Usermod menu.  There are no parameters to set in code!  The following settings can be configured in the Usermod Menu:
+- The i2c address in decimal. Set it to either 118 (0x76, the default) or 119 (0x77).
 - Temperature Decimals (number of decimal places to output)
 - Humidity Decimals
 - Pressure Decimals

usermods/BME280_v2/usermod_bme280.h

@@ -24,6 +24,7 @@ class UsermodBME280 : public Usermod
   uint8_t  PressureDecimals = 0;    // Number of decimal places in published pressure values
   uint16_t TemperatureInterval = 5; // Interval to measure temperature (and humidity, dew point if available) in seconds
   uint16_t PressureInterval = 300;  // Interval to measure pressure in seconds
+  BME280I2C::I2CAddr I2CAddress = BME280I2C::I2CAddr_0x76;  // i2c address, defaults to 0x76
   bool PublishAlways = false;             // Publish values even when they have not changed
   bool UseCelsius = true;                 // Use Celsius for Reporting
   bool HomeAssistantDiscovery = false;    // Publish Home Assistant Device Information
@@ -35,20 +36,7 @@ class UsermodBME280 : public Usermod
   #endif
   bool initDone = false;
 
-  // BME280 sensor settings
-  BME280I2C::Settings settings{
-      BME280::OSR_X16, // Temperature oversampling x16
-      BME280::OSR_X16, // Humidity oversampling x16
-      BME280::OSR_X16, // Pressure oversampling x16
-      // Defaults
-      BME280::Mode_Forced,
-      BME280::StandbyTime_1000ms,
-      BME280::Filter_Off,
-      BME280::SpiEnable_False,
-      BME280I2C::I2CAddr_0x76 // I2C address. I2C specific. Default 0x76
-  };
-
-  BME280I2C bme{settings};
+  BME280I2C bme;
 
   uint8_t sensorType;
 
@@ -181,34 +169,52 @@ class UsermodBME280 : public Usermod
       }
     }
 
-public:
-  void setup()
-  {
-    if (i2c_scl<0 || i2c_sda<0) { enabled = false; sensorType = 0; return; }
-
-    if (!bme.begin())
+    void initializeBmeComms()
     {
-      sensorType = 0;
-      DEBUG_PRINTLN(F("Could not find BME280 I2C sensor!"));
-    }
-    else
-    {
-      switch (bme.chipModel())
+      BME280I2C::Settings settings{
+            BME280::OSR_X16,    // Temperature oversampling x16
+            BME280::OSR_X16,    // Humidity oversampling x16
+            BME280::OSR_X16,    // Pressure oversampling x16
+            BME280::Mode_Forced,
+            BME280::StandbyTime_1000ms,
+            BME280::Filter_Off,
+            BME280::SpiEnable_False,
+            I2CAddress
+        };
+
+      bme.setSettings(settings);
+
+      if (!bme.begin())
       {
-      case BME280::ChipModel_BME280:
-        sensorType = 1;
-        DEBUG_PRINTLN(F("Found BME280 sensor! Success."));
-        break;
-      case BME280::ChipModel_BMP280:
-        sensorType = 2;
-        DEBUG_PRINTLN(F("Found BMP280 sensor! No Humidity available."));
-        break;
-      default:
         sensorType = 0;
-        DEBUG_PRINTLN(F("Found UNKNOWN sensor! Error!"));
+        DEBUG_PRINTLN(F("Could not find BME280 I2C sensor!"));
+      }
+      else
+      {
+        switch (bme.chipModel())
+        {
+        case BME280::ChipModel_BME280:
+          sensorType = 1;
+          DEBUG_PRINTLN(F("Found BME280 sensor! Success."));
+          break;
+        case BME280::ChipModel_BMP280:
+          sensorType = 2;
+          DEBUG_PRINTLN(F("Found BMP280 sensor! No Humidity available."));
+          break;
+        default:
+          sensorType = 0;
+          DEBUG_PRINTLN(F("Found UNKNOWN sensor! Error!"));
+        }
       }
     }
-    initDone=true;
+
+public:
+  void setup()
+  {
+    if (i2c_scl<0 || i2c_sda<0) { enabled = false; sensorType = 0; return; }
+
+    initializeBmeComms();
+    initDone = true;
   }
 
   void loop()
@@ -365,7 +371,6 @@ class UsermodBME280 : public Usermod
     }
     else if (sensorType==2) //BMP280
     {
-
       JsonArray temperature_json = user.createNestedArray(F("Temperature"));
       JsonArray pressure_json = user.createNestedArray(F("Pressure"));
       temperature_json.add(roundf(sensorTemperature * powf(10, TemperatureDecimals)) / powf(10, TemperatureDecimals));
@@ -399,6 +404,7 @@ class UsermodBME280 : public Usermod
   {
     JsonObject top = root.createNestedObject(FPSTR(_name));
     top[FPSTR(_enabled)] = enabled;
+    top[F("I2CAddress")] = static_cast<uint8_t>(I2CAddress);
     top[F("TemperatureDecimals")] = TemperatureDecimals;
     top[F("HumidityDecimals")] = HumidityDecimals;
     top[F("PressureDecimals")] = PressureDecimals;
@@ -426,6 +432,10 @@ class UsermodBME280 : public Usermod
 
     configComplete &= getJsonValue(top[FPSTR(_enabled)], enabled);
     // A 3-argument getJsonValue() assigns the 3rd argument as a default value if the Json value is missing
+    uint8_t tmpI2cAddress;
+    configComplete &= getJsonValue(top[F("I2CAddress")], tmpI2cAddress, 0x76);
+    I2CAddress = static_cast<BME280I2C::I2CAddr>(tmpI2cAddress);
+
     configComplete &= getJsonValue(top[F("TemperatureDecimals")], TemperatureDecimals, 1);
     configComplete &= getJsonValue(top[F("HumidityDecimals")], HumidityDecimals, 0);
     configComplete &= getJsonValue(top[F("PressureDecimals")], PressureDecimals, 0);
@@ -440,8 +450,23 @@ class UsermodBME280 : public Usermod
       // first run: reading from cfg.json
       DEBUG_PRINTLN(F(" config loaded."));
     } else {
-      DEBUG_PRINTLN(F(" config (re)loaded."));
       // changing parameters from settings page
+      DEBUG_PRINTLN(F(" config (re)loaded."));
+
+      // Reset all known values
+      sensorType = 0;
+      sensorTemperature = 0;
+      sensorHumidity = 0;
+      sensorHeatIndex = 0;
+      sensorDewPoint = 0;
+      sensorPressure = 0;
+      lastTemperature = 0;
+      lastHumidity = 0;
+      lastHeatIndex = 0;
+      lastDewPoint = 0;
+      lastPressure = 0;
+
+      initializeBmeComms();
     }
 
     return configComplete;