create 4-1_Po_Ctrl_I2CLCD from 3-12
沒有繪製Schematic, SDA–接 Arduino 的 Analog Pin 4,  SCL–接 Arduino 的 Analog Pin 5,  GND–接GND,  VCC–接 +5V
Increase LiquidCrystal_i2c library(16x2)
Increase LiquidCrystal_i2c library(16x4), Reference http://coopermaa2nd.blogspot.tw/2012/09/i2c-16x2-lcd.html
Increase library instructions
modify code, can show "hello world" , reference http://coopermaa2nd.blogspot.tw/2012/09/i2c-16x2-lcd.html
modify code , use lcd.clear() clear screen, lcd.setCursor() can set start position, you can reference LiquidCrystal_I2C.h
increase loop print message