Starter Guide

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LCD 1602:
VSS
GND
VDD
3.3V
V0
Analog input
RS
Digital input
RW
Digital input
E
Digital input
D0
Digital input
D1
Digital input
D2
Digital input
D3
Digital input
D4
Digital input
D5
Digital input
D6
Digital input
D7
Digital input
A
3.3V
K
GND
What is IIC interface?
The IO ports of the micro: bit is limited. We need a lot of ports if we want
to directly drive the LCD1602. But there may be not enough ports to
connect other sensors. In order to solve this problem, a PCF8574-based I2C
interface module is used here. It is to expand the IO ports of the micro: bit
so that only two pins (SDA and SCL) are needed to control the LCD1602 and
to save many ports to connect more sensors.