Keyestudio KS4028 Manual page 303

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MCU, which highly save the MCU resources.
On the back of LCD display, there is a blue potentiometer for adjusting the
backlight. The communication address defaults to 0x27.
The original 1602 LCD can start and run with 7 IO ports, but ours is built
with Arduino IIC/I2C interface, saving 5 IO ports. Alternatively, the module
comes with 4 positioning holes with a diameter of 3mm, which is
convenient for you to fix on other devices.
Notice that when the screen gets brighter or darker, the characters will
become more visible or less visible.
(2) Parameters：
Working DC5V
Voltage ：
Working < 130mA
Current：
I2C 0x27
Address
：
Workin 0 ° C ~ 45 ° C
g （recommend）
Temper
Control I2C
Port：
Driving PCF8574T
Chip：
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