Add support for the BMP085/BMP180 sensor

WeatherStation.ino

@@ -35,17 +35,23 @@
 # include <DHT.h>
 #endif // DHT_TYPE
 
-#ifdef HAVE_BH1750
+#if defined(HAVE_BH1750) || defined(HAVE_BMP180)
 # include <Wire.h>
+#endif // defined(HAVE_BH1750) || defined(HAVE_BMP180)
+
+#ifdef HAVE_BH1750
 # include <BH1750.h>
 #endif // HAVE_BH1750
 
+#ifdef HAVE_BMP180
+# include <Adafruit_BMP085.h>
+#endif // HAVE_BMP180
+
 ESP8266WebServer server(80);
 unsigned long last_update = 0;
 
 #ifdef DHT_TYPE
 DHT dht(DHT_PIN, DHT_TYPE);
-float temperature = 0.0;
 float humidity = 0.0;
 #endif // DHT_TYPE
 
@@ -58,6 +64,15 @@ BH1750 light;
 float light_level = 0;
 #endif // HAVE_BH1750
 
+#if defined(DHT_TYPE) || defined(HAVE_BMP180)
+float temperature = 0.0;
+#endif // defined(DHT_TYPE) || defined(HAVE_BMP180)
+
+#ifdef HAVE_BMP180
+Adafruit_BMP085 BMP;
+uint32_t pressure = 0;
+#endif // HAVE_BMP180
+
 static const char TEXT_PLAIN[] PROGMEM = "text/plain";
 
 void
@@ -69,13 +84,18 @@ reply_not_found()
 void
 send_metrics()
 {
-    static const size_t dht_size = 228;
+    static const size_t temperature_size = 117;
+    static const size_t humidity_size = 111;
     static const size_t rain_size = 86;
     static const size_t light_size = 72;
+    static const size_t pressure_size = 82;
 
     size_t message_size =
+#if defined(DHT_TYPE) || defined(HAVE_BMP180)
+        temperature_size +
+#endif // defined(DHT_TYPE) || defined(HAVE_BMP180)
 #ifdef DHT_TYPE
-        dht_size +
+        humidity_size +
 #endif // DHT_TYPE
 #ifdef RAIN_PIN
         rain_size +
@@ -83,14 +103,19 @@ send_metrics()
 #ifdef HAVE_BH1750
         light_size +
 #endif // HAVE_BH1750
+#ifdef HAVE_BMP180
+        pressure_size +
+#endif // HAVE_BMP180
         1;
     char message[message_size];
 
     snprintf(message, message_size,
-#ifdef DHT_TYPE
+#if defined(DHT_TYPE) || defined(HAVE_BMP180)
              "# HELP temperature_celsius Temperature in degrees Celsius\n"
              "# TYPE temperature_celsius gauge\n"
              "temperature_celsius %.2f\n"
+#endif // defined(DHT_TYPE) || defined(HAVE_BMP180)
+#ifdef DHT_TYPE
              "# HELP relative_humidity Relative humidity, in percents\n"
              "# TYPE relative_humidity gauge\n"
              "relative_humidity %.2f\n"
@@ -105,8 +130,16 @@ send_metrics()
            "# TYPE light gauge\n"
            "light %.2f\n"
 #endif // HAVE_BH1750
+#ifdef HAVE_BMP180
+           "# HELP pressure Atmospheric pressure, in Pa\n"
+           "# TYPE pressure gauge\n"
+           "pressure %d\n"
+#endif // HAVE_BMP180
+#if defined(DHT_TYPE) || defined(HAVE_BMP180)
+             , temperature
+#endif // defined(DHT_TYPE) || defined(HAVE_BMP180)
 #ifdef DHT_TYPE
-             , temperature, humidity
+             , humidity
 #endif // DHT_TYPE
 #ifdef RAIN_PIN
              , raining ? 1 : 0
@@ -114,6 +147,9 @@ send_metrics()
 #ifdef HAVE_BH1750
              , light_level
 #endif // HAVE_BH1750
+#ifdef HAVE_BMP180
+             , pressure
+#endif // HAVE_BMP180
         );
 
     server.send(200, "text/plain; version=0.0.4; charset=utf-8", message);
@@ -178,6 +214,13 @@ setup()
     }
 #endif // HAVE_BH1750
 
+#ifdef HAVE_BMP180
+    if (!bmp.begin()) {
+        Serial.println("Could not find the BMP180 sensor!");
+        stop();
+    }
+#endif // HAVE_BMP180
+
     Serial.println("All set, starting the loop.");
 }
 
@@ -187,10 +230,10 @@ read_sensors()
     // Turn on the LED to indicate that we’re working
     digitalWrite(LED_BUILTIN, LOW);
 
-#ifdef DHT_TYPE
+#if defined(DHT_TYPE)
     temperature = dht.readTemperature();
     humidity = dht.readHumidity();
-#endif
+#endif // DHT_TYPE
 
 #ifdef RAIN_PIN
     raining = (digitalRead(RAIN_PIN) == HIGH);
@@ -200,6 +243,15 @@ read_sensors()
     light_level = light.readLightLevel();
 #endif // HAVE_BH1750
 
+#ifdef HAVE_BMP180
+    pressure = bmp.readPressure();
+
+    // If we have a DHT sensor, we already measured the temperature
+# ifndef DHT_TYPE
+    temperature = bmp.readTemperature();
+# endif // !DHT_TYPE
+#endif // HAVE_BMP180
+
     // Turn off the LED to indicate work is finished
     digitalWrite(LED_BUILTIN, HIGH);
 }

config.h.sample

@@ -64,3 +64,10 @@
 // and SCL pins using the I2C_SDA_PIN and I2C_SCL_PIN defines above.
 #undef HAVE_BH1750
 //#define HAVE_BH1750
+
+// If you have a BMP180 or BMP085 pressure + temperature sensor, remove this
+// #undef line and uncomment the #define HAVE_BMP180 line.  You will also have
+// to set the SDA and SCL pins using the I2C_SDA_PIN and I2C_SCL_PIN defines
+// above.
+#undef HAVE_BMP180
+// #define HAVE_BMP180