Item Type: Single-Chip Microcomputer Module Material: PCB Purpose: Learning, testing, development Power Supply Voltage: DC 5V Number of Characters: 16 characters, 2 lines Product Size: Approx. 80 x 36mm / 3.1 x 1.4in Screen Size: 65x14 How to Use: Pin 1: VSS is the ground power Pin 2: VDD is connected to 5V positive power supply 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 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 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 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 Pins 7 to 14: D0 to D7 are 8-bit bidirectional data lines Pin 15: Positive backlight power supply Pin 16: Negative backlight power supply