Keyestudio ARDUINO maker learning kit, Manual

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Result
Burn the program into Uno board The dot-matrix will display 0.
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Project 27: 1602 LCD
Introduction
In this experiment, we use an Arduino to drive the 1602 LCD.
1602 LCD has wide applications. In the beginning, 1602 LCD uses a HD44780 controller. Now,
almost all 1602 LCD module uses a compatible IC, so their features are basically the same.
1602LCD main parameters:
 Display capacity: 16 * 2 characters.
 Chip operating voltage: 4.5 ~ 5.5V.
 Working current: 2.0mA (5.0V).
 Optimum working voltage of the module is 5.0V.
 Character size: 2.95 * 4.35 (W * H) mm.
Pin description of 1602 LCD
No. Mark Pin description No. Mark Pin description
1 VSS Power GND 9 D2 Date I/O
2 VDD Power positive 10 D3 Date I/O
3 VL LCD voltage bias signal 11 D4 Date I/O
4 RS Select data/command(V/L) 12 D5 Date I/O