Added a setAddress function

LiquidCrystal_I2C.cpp

@@ -52,6 +52,10 @@ LiquidCrystal_I2C::LiquidCrystal_I2C(uint8_t lcd_Addr,uint8_t lcd_cols,uint8_t l
   _backlightval = LCD_NOBACKLIGHT;
 }
 
+void LiquidCrystal_I2C::setAddress(uint8_t lcd_Addr){
+	_Addr = lcd_Addr;
+}
+
 void LiquidCrystal_I2C::init(){
 	init_priv();
 }

LiquidCrystal_I2C.h

@@ -55,6 +55,7 @@
 class LiquidCrystal_I2C : public Print {
 public:
   LiquidCrystal_I2C(uint8_t lcd_Addr,uint8_t lcd_cols,uint8_t lcd_rows);
+  void setAddress(uint8_t lcd_Addr);
   void begin(uint8_t cols, uint8_t rows, uint8_t charsize = LCD_5x8DOTS );
   void clear();
   void home();

examples/LiquidCrystalFindAddress/LiquidCrystalFindAddress.ino

@@ -0,0 +1,54 @@
+/*
+ * This sketch will loop through adresses until it sees an I2C device
+ * When an address is found, we'll assume it's an Liquidcrystal I2C
+ * display and show the address there as well as on Serial.
+ * 
+ * written by Jens Chr Brynildsen 2017 to help test 30 screens with
+ * varying I2C addresses.
+ */
+
+//Compatible with the Arduino IDE 1.0
+//Library version:1.1
+#include <Wire.h>
+#include <LiquidCrystal_I2C.h>
+
+LiquidCrystal_I2C lcd(0, 20, 4);
+int address;
+char buff[10];
+
+void setup()
+{
+  Serial.begin(9600);
+  pinMode(LED_BUILTIN, OUTPUT);
+  Wire.begin();
+  delay(2000);
+
+  for (address = 0; address <= 119; address++) {
+    Wire.beginTransmission(address);
+    int error = Wire.endTransmission();
+
+    if (error == 0) { // device found
+      sprintf(buff, "%02x", address);
+      Serial.print("Address: ");
+      Serial.println( buff );
+      lcd.setAddress( address ); // set the address
+      lcd.init();
+      lcd.backlight();
+      lcd.setCursor(0, 0);
+      lcd.print("Hello world");
+      lcd.setCursor(0, 1);
+      lcd.print("I2C addr: 0x");
+      lcd.setCursor(12, 1);
+      lcd.print(buff);
+      while (1);
+    }
+  }
+}
+
+
+void loop()
+{
+  // if we reach this point, nothing was found on the I2C bus
+  digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN) );
+  delay(100);
+}