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4Bit HD44780 LCD and PCF8574 Pinout
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+-\/-+
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A0 1| |16 VCC
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A1 2| |15 SCA
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A2 3| |14 SCL
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RS 4| |13 N/C
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RW 5| |12 PD7
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E 6| |11 PD6
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CTRL 7| |10 PD5
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GND 8| |9 PD4
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+----+
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