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This LCD backpack is built on port expander IC PCF8574T which converts the parallel interface of LCD to I2C interface.Only 2 wires SDA & SCL needed apart from Vcc,Gnd for communication with uC.
Can be soldered on to 16 x 2 , 16 x 4 & 20 x 4 LCDs.
Download Arduino Library & example code here :
www.alselectro.com/files/Libra...