But with a little change in the init lines:
LiquidCrystal_I2C lcd(0x20, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); // Addr, En, Rw, Rs, d4, d5, d6, d7, backlighpin, polarity
This is IIC Serial 20X4 LCD module . With this I2C interface LCD module, you will be able to realize data display via only 2 wires. If you already has I2C devices in your project, this LCD module actually cost no more resources at all. It Is fantastic for Arduino based project.
Interface: I2C
I2C Address: 0x27(it can't be changed )
Sofware version :0022
SDA (DATA) -> analog input pin 4
SCL (CLOCK) -> analog input pin 5
Pin Definition : GND, VCC, SDA, SCL
Back lit (Blue with black char color)
Supply voltage: 5V
Pcb Size : 60mm × 99mm
Contrast Adjust : Potentiometer
Backlight Adjust : Jumper

# LCD Backlight Module Arduino Test Code:
#include
#include
LiquidCrystal_I2C lcd(0x27,16,2); //set the LCD address to 0x27 for a 16 chars and 2 line display
Void setup()
{
Lcd.init();
Lcd.backlight();
lcd.setCursor(0, 0);
Lcd.print("b2cqshop");
lcd.setCursor(0, 1);
Lcd.print("Voltage: ");
lcd.setCursor(13, 1);
Lcd.print("V");
}
Void loop()
{
Int val;
Float temp;
Val=analogRead(0);
Temp=val/4.092;
Val=(int)temp;//
lcd.setCursor(9, 1);
Lcd.print(0x30+val/100, BYTE);
Lcd.print(0x30+(val0)/10, BYTE);
Lcd.print('.');
Lcd.print(0x30+val, BYTE);
Delay(100);
}

# LCD Backlight Module Package Included :
1PCx IIC/I2C/TWI/SPI Serial Interface2004 20X4 Character LCD Module Display Blue

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