From 4a28eb7b4cbb3095e9a5d3f3cc55b1d36cdbc762 Mon Sep 17 00:00:00 2001
From: jenschr <jenschr@gmail.com>
Date: Sat, 26 Aug 2017 21:20:28 +0200
Subject: [PATCH 1/2] Added a setAddress function to make it possible to scan
 to the correct address and then display that on the Liquidcrysta display
 itself

---
 LiquidCrystal_I2C.cpp                         |  4 ++
 LiquidCrystal_I2C.h                           |  1 +
 .../LiquidCrystalFindAddress.ino              | 54 +++++++++++++++++++
 3 files changed, 59 insertions(+)
 create mode 100644 examples/LiquidCrystalFindAddress/LiquidCrystalFindAddress.ino

diff --git a/LiquidCrystal_I2C.cpp b/LiquidCrystal_I2C.cpp
index 44b7b05..bb07bb4 100644
--- a/LiquidCrystal_I2C.cpp
+++ b/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();
 }
diff --git a/LiquidCrystal_I2C.h b/LiquidCrystal_I2C.h
index c033f7f..fc38119 100644
--- a/LiquidCrystal_I2C.h
+++ b/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();
diff --git a/examples/LiquidCrystalFindAddress/LiquidCrystalFindAddress.ino b/examples/LiquidCrystalFindAddress/LiquidCrystalFindAddress.ino
new file mode 100644
index 0000000..927aa15
--- /dev/null
+++ b/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.addr( 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);
+}

From 49a49810fb2819dffeb0e53a38831a6a8a15e67a Mon Sep 17 00:00:00 2001
From: Jens Chr Brynildsen <jenschr@gmail.com>
Date: Tue, 26 Dec 2017 03:27:05 +0100
Subject: [PATCH 2/2] Incorrctly named method after refactoring

---
 examples/LiquidCrystalFindAddress/LiquidCrystalFindAddress.ino | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/examples/LiquidCrystalFindAddress/LiquidCrystalFindAddress.ino b/examples/LiquidCrystalFindAddress/LiquidCrystalFindAddress.ino
index 927aa15..db7f018 100644
--- a/examples/LiquidCrystalFindAddress/LiquidCrystalFindAddress.ino
+++ b/examples/LiquidCrystalFindAddress/LiquidCrystalFindAddress.ino
@@ -31,7 +31,7 @@ void setup()
       sprintf(buff, "%02x", address);
       Serial.print("Address: ");
       Serial.println( buff );
-      lcd.addr( address ); // set the address
+      lcd.setAddress( address ); // set the address
       lcd.init();
       lcd.backlight();
       lcd.setCursor(0, 0);