Sometimes I forgot how to use LCD I2C whenever I want to use it in my projects. Two things I always forgot :-
1. Connection between Arduino Uno and LCD I2C
2. Basic code.
There are at least three versions of LCD I2C and I use the first version which marked YwRobot Arduino LCM1602 IIC V1 on it.
Here are the wires connection between Arduino Uno and LCM1602 IIC V1 :-
Arduino Uno <---> LCM1602 IIC V1
GND <---> GND
5V <---> VCC
A4 <---> SDA
A5 <---> SDL
The library which is written by Francisco Malpartida (https://bitbucket.org/fmalpartida) can be downloaded here :-
https://bitbucket.org/fmalpartida/new-liquidcrystal/downloads
Details and code of LCD I2C can be found here :-
https://arduino-info.wikispaces.com/LCD-Blue-I2C
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