selectable i2c Pins for esp8266 and other

BH1750.cpp

@@ -56,6 +56,20 @@ BH1750::BH1750(byte addr) {
 
 }
 
+/**
+ * Begin I2C and configure sensor
+ * @param SDA Date SCL Clock mode Measurment mode
+ */
+#if defined(ARDUINO_ARCH_ESP8266)
+void BH1750::begin(uint8_t SDA, uint8_t SCL, uint8_t mode) {
+
+  // allow config of pins
+  Wire.begin(SDA,SCL);
+
+  // Configure sensor in specified mode
+  configure(mode);
+}
+#endif
 
 /**
  * Begin I2C and configure sensor

BH1750.h

@@ -60,6 +60,10 @@ class BH1750 {
 
   public:
     BH1750 (byte addr = 0x23);
+    #if defined(ARDUINO_ARCH_ESP8266)
+    /* ==== On esp8266 it is possible to define I2C pins ==== */
+    void begin (uint8_t SDA, uint8_t SCL, uint8_t mode = BH1750_CONTINUOUS_HIGH_RES_MODE);
+    #endif
     void begin (uint8_t mode = BH1750_CONTINUOUS_HIGH_RES_MODE);
     void configure (uint8_t mode);
     uint16_t readLightLevel(void);

bh1750.patch

@@ -0,0 +1,40 @@
+diff --git a/BH1750.cpp b/BH1750.cpp
+index e7a2f30..ed48cf1 100644
+--- a/BH1750.cpp
++++ b/BH1750.cpp
+@@ -56,6 +56,20 @@ BH1750::BH1750(byte addr) {
+ 
+ }
+ 
++/**
++ * Begin I2C and configure sensor
++ * @param SDA Date SCL Clock mode Measurment mode
++ */
++#if defined(ARDUINO_ARCH_ESP8266)
++void BH1750::begin(uint8_t SDA, uint8_t SCL, uint8_t mode) {
++
++  // allow config of pins
++  Wire.begin(SDA,SCL);
++
++  // Configure sensor in specified mode
++  configure(mode);
++}
++#endif
+ 
+ /**
+  * Begin I2C and configure sensor
+diff --git a/BH1750.h b/BH1750.h
+index 947283d..90dc4df 100644
+--- a/BH1750.h
++++ b/BH1750.h
+@@ -60,6 +60,10 @@ class BH1750 {
+ 
+   public:
+     BH1750 (byte addr = 0x23);
++    #if defined(ARDUINO_ARCH_ESP8266)
++    /* ==== On esp8266 it is possible to define I2C pins ==== */
++    void begin (uint8_t SDA, uint8_t SCL, uint8_t mode = BH1750_CONTINUOUS_HIGH_RES_MODE);
++    #endif
+     void begin (uint8_t mode = BH1750_CONTINUOUS_HIGH_RES_MODE);
+     void configure (uint8_t mode);
+     uint16_t readLightLevel(void);