1PCS LCD1602 1602 LCD Module 16x2 IIC/I2C PCF8574 LCD Display Screen Character Blue/Green Blacklight 5V for Arduino MAEG2560   LCD1602/2004 LCD screen adapter board IIC/I2C/interface to send function library compatible for Arduino Product parameters: 1. Size: 41.5mm (length) * 19mm (width) * 15.3mm (height) 2. Weight: 5g 3. PCB color: black 4. Power supply voltage: 2.5V-6V 5. Support I2C protocol 6. With backlight, you can set whether to have backlight through the jumper cap. Plug in the jumper cap with backlight Lamp, remove the jumper cap to cancel the backlight. 7. The contrast can be adjusted by the blue potentiometer, which increases clockwise and decreases counterclockwise. Potentiometer Designed on the front for easy adjustment by customers. 8. Equipment address: It can be modified through short circuit A0/A1/A2, and the default address can be detected using the program. Address modification instructions: (Taking the default address 0x27 as an example) A0, A1, A2 are all suspended, and the device address is 0x27 Short circuit A0, device address 0x26 Short circuit A1, device address 0x25 Short circuit A2, device address 0x23 A0, A1, A2 are all short circuited, and the device address is 0x20 Wiring instructions: GND: negative pole of system power supply VCC: System power supply positive pole SDA: IIC data cable SCL: IIC clock line