Allow to specify I2C address

Author: sebromero

src/Modulino_LED_Matrix.h

@@ -23,6 +23,8 @@
 #define DEFAULT_WIRE Wire
 #endif
 
+#define DEFAULT_ADDRESS 0x39
+
 class ModulinoLEDMatrix
 #ifdef MATRIX_WITH_ARDUINOGRAPHICS
     : public ArduinoGraphics
@@ -42,7 +44,8 @@ class ModulinoLEDMatrix
     void autoscroll(uint32_t interval_ms) {
         _interval = interval_ms;
     }
-    int begin() {
+    int begin(uint8_t address = DEFAULT_ADDRESS) {
+        _address = address;
         bool rv = true;
         _wire->begin();
         return rv;
@@ -63,7 +66,7 @@ class ModulinoLEDMatrix
             }
             _sequenceDone = true;
         }
-        _wire->beginTransmission(0x39);
+        _wire->beginTransmission(_address);
         _wire->write((uint8_t*)frame, sizeof(frame));
         _wire->endTransmission();
     }
@@ -219,4 +222,5 @@ class ModulinoLEDMatrix
     bool _sequenceDone = false;
     voidFuncPtr _callBack = nullptr;
     HardwareI2C* _wire;
+    uint8_t _address = 0;
 };