Item Type: Single-Chip Microcomputer Module_x000D_ Material: PCB_x000D_ Purpose: Learning, testing, development_x000D_ Power Supply Voltage: DC 5V_x000D_ Number of Characters: 16 characters, 2 lines_x000D_ Product Size: Approx. 80 x 36mm / 3.1 x 1.4in_x000D_ Screen Size: 65x14_x000D_ How to Use: _x000D_ Pin 1: VSS is the ground power_x000D_ Pin 2: VDD is connected to 5V positive power supply_x000D_ Pin 3: V0 is the contrast adjustment terminal of the liquid crystal display. The contrast is the weakest when the positive power is connected, and the contrast is the highest when the power is grounded. When the contrast is too high, it will produce "ghost images". When using it, you can adjust the contrast through a 10K potentiometer_x000D_ Pin 4: RS is the register selection, the data register is selected when the level is high, and the instruction register is selected when the level is low_x000D_ Pin 5: R/W is the read and write signal line, read operation at high level, and write operation at low level. When RS and RW are both low level, the command or display address can be written. When RS is low level and RW is high level, the busy signal can be read. When RS is high level and RW is low level, data can be written_x000D_ Pin 6: The E terminal is the enable terminal. When the E terminal changes from high level to low level, the LCD module executes the command_x000D_ Pins 7 to 14: D0 to D7 are 8-bit bidirectional data lines_x000D_ Pin 15: Positive backlight power supply_x000D_ Pin 16: Negative backlight power supply