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LCD 1602 16×2 character display

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An LCD 1602 (16×2) character display without an I2C module utilizes a parallel interface powered by the Hitachi HD44780 controller chip. It features 16 bare pins that connect directly to your microcontroller. It is typically operated in 4-bit mode to reduce the required microcontoller pins from 11 down to 6 GPIO control/data pins.
Standard 16-Pin Assignment
Pin  Name Description Connection Target
1 VSS Ground Ground (GND)
2 VDD/VCC Power Supply (+5V) 5V Power
3 V0 Contrast Adjustment Potentiometer center wiper pin
4 RS Register Select Microcontroller GPIO (e.g., Pin 12)
5 R/W Read/Write Ground (GND) for Write mode
6 E Enable Clock Microcontroller GPIO (e.g., Pin 11)
7-10 D0-D3 Low Data Bits Left disconnected in 4-bit mode
11 D4 High Data Bit 4 Microcontroller GPIO (e.g., Pin 5)
12 D5 High Data Bit 5 Microcontroller GPIO (e.g., Pin 4)
13 D6 High Data Bit 6 Microcontroller GPIO (e.g., Pin 3)
14 D7 High Data Bit 7 Microcontroller GPIO (e.g., Pin 2)
15 A / LED+ Backlight Anode +5V (via 220Ω resistor)
16 K / LED- Backlight Cathode Ground (GND)
Required Equipment
  • LCD 1602 Module (No I2C backpack)
  • 10kΩ Potentiometer (Crucial for adjusting the text visibility contrast)
  • 220Ω Resistor (Protects the backlight LED from burning out)
  • Microcontroller (e.g., Arduino Uno, Nano, or ESP32)
  • Jumper wires and Breadboard

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