I2C 20x4 Arduino LCD Display Module
20x4 character LCD with I2C interface, white text on blue backlight, adjustable contrast. Operates at 5V or 3.3V; reduces pin usage to 2 lines (SDA/SCL).
Pinout
- VCCDFRobot product page V1.2 connector label VCC; physical order not asserted beyond the source label list
Power input for the LCD2004 I2C module when using the V1.2 I2C connector.
Type · PowerVoltage · 5V via pin connector; module also supports 3.3V via IDC10 per DFRobot specification - GNDDFRobot product page V1.2 connector label GND; physical order not asserted beyond the source label list
Ground reference for the module power and I2C signals.
Type · GroundVoltage · 0V - SCLDFRobot product page V1.2 connector label SCL; Arduino UNO wiring uses A5 per DFRobot example
I2C/TWI clock line for the LCD2004 controller backpack.
Type · I2CVoltage · I2C logic level for the host board used, with module powered from supported 5V/3.3V supply path - SDADFRobot product page V1.2 connector label SDA; Arduino UNO wiring uses A4 per DFRobot example
I2C/TWI data line for the LCD2004 controller backpack.
Type · I2CVoltage · I2C logic level for the host board used, with module powered from supported 5V/3.3V supply path
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| VCC | DFRobot product page V1.2 connector label VCC; physical order not asserted beyond the source label list | Power | Power input for the LCD2004 I2C module when using the V1.2 I2C connector. | 5V via pin connector; module also supports 3.3V via IDC10 per DFRobot specification |
| GND | DFRobot product page V1.2 connector label GND; physical order not asserted beyond the source label list | Ground | Ground reference for the module power and I2C signals. | 0V |
| SCL | DFRobot product page V1.2 connector label SCL; Arduino UNO wiring uses A5 per DFRobot example | I2C | I2C/TWI clock line for the LCD2004 controller backpack. | I2C logic level for the host board used, with module powered from supported 5V/3.3V supply path |
| SDA | DFRobot product page V1.2 connector label SDA; Arduino UNO wiring uses A4 per DFRobot example | I2C | I2C/TWI data line for the LCD2004 controller backpack. | I2C logic level for the host board used, with module powered from supported 5V/3.3V supply path |
Pin details
4 connections- VCCDFRobot product page V1.2 connector label VCC; physical order not asserted beyond the source label list
Power input for the LCD2004 I2C module when using the V1.2 I2C connector.
PowerVoltage · 5V via pin connector; module also supports 3.3V via IDC10 per DFRobot specification - GNDDFRobot product page V1.2 connector label GND; physical order not asserted beyond the source label list
Ground reference for the module power and I2C signals.
GroundVoltage · 0V - SCLDFRobot product page V1.2 connector label SCL; Arduino UNO wiring uses A5 per DFRobot example
I2C/TWI clock line for the LCD2004 controller backpack.
I2CVoltage · I2C logic level for the host board used, with module powered from supported 5V/3.3V supply path - SDADFRobot product page V1.2 connector label SDA; Arduino UNO wiring uses A4 per DFRobot example
I2C/TWI data line for the LCD2004 controller backpack.
I2CVoltage · I2C logic level for the host board used, with module powered from supported 5V/3.3V supply path
Start wiring
SPI · I2C · 3.3 V · 3.3 – 5 V · Breakout
Adafruit describes product 398 as a 16x2 RGB backlight LCD using digital pins for LCD control and PWM pins for the backlight; the product…
Module pins: VCC, GND, SCL, SDA. Schematik maps them to your board in the app.
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