To use a bare, HD44780-compatible LCD 1602 with Arduino, wire it in four-bit mode, connect its contrast pin (VO) to a potentiometer, then initialize the LiquidCrystal library with lcd.begin(16, 2). The example below follows Arduino’s documented pin map; other suitable pins work if the wiring and code agree.
Check which kind of LCD 1602 you have
“LCD 1602” refers to a character display with 16 columns and two rows. The instructions here are for a bare parallel-interface module compatible with the Hitachi HD44780 controller. Arduino’s LiquidCrystal library example supports displays compatible with that controller.
If your display has an I2C backpack attached, it uses a different interface and wiring path. Use the backpack’s own documentation and instructions; the parallel pin map below does not apply, and the cited Arduino examples do not establish one universal I2C address or library.
Wire the bare display to Arduino
With the Arduino board disconnected from power, follow the labels on your particular LCD module. Pin order can vary, so do not rely on physical position alone. Arduino’s documented four-bit example uses these connections:
#1 Best Overall
- 1602 LCD screen can display 2 lines x 16 characters, with i2c serial interface, blue display.
- Built-in independent potentiometer, backlight can be adjusted through the back potentiometer.
- Power supply: 5v; I2C address: 0x27; wiring method: GND—GND, VCC—VCC, SDA—A4, SCL—A5.
- Compatible with most development boards, such as Arduino, Raspberry pi, Tinkerboard, Nano pi, Banana pi, stm32, etc.
- Widely used in: Internet of Things, school electronics projects, smart buildings, maker DIY projects, etc., can display letters, characters, numbers, real-time clock or temperature.
| LCD signal | Arduino connection |
|---|---|
| RS | Digital pin 12 |
| Enable (E) | Digital pin 11 |
| D4 | Digital pin 5 |
| D5 | Digital pin 4 |
| D6 | Digital pin 3 |
| D7 | Digital pin 2 |
| R/W | Ground |
| VSS | Ground |
| VCC | 5V, as shown in Arduino’s example |
| VO (contrast) | Potentiometer wiper; connect the potentiometer’s two ends to 5V and ground |
Arduino’s example specifies a 10K or 100K potentiometer for contrast. It uses data lines D4–D7, not all eight data lines. The example does not specify backlight wiring: check the module’s markings or manufacturer documentation for its A/K or LED pins, voltage, current, and any resistor requirement.
Upload a sketch that prints text
In the Arduino IDE, create a sketch with this code and upload it to the board:
Rank #2
- Use the i2c protocol to reduce the occupation of I/O ports, making it easier to add to the project, and less wiring is more beautiful.
- Commonly used in: Internet of things, DIY project, home animation, smartbuilding, maker's DIY project.
- Compatible with all current development boards, such as Arduino, Raspberry pi, Tinkerboard, Nano pi, Banana pi, stm32 and so on
- With a potentiometer used to adjust backlight (Color: Blue) and contrast.Power supply: 5v and I2C address is: 0x27 Module dimension: 80mm x 35mm x 11mm
#include <LiquidCrystal.h>
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
void setup() {
lcd.begin(16, 2);
lcd.print("hello, world!");
}
void loop() {
lcd.setCursor(0, 1);
lcd.print(millis() / 1000);
}The constructor arguments must be in this order: RS, Enable, D4, D5, D6, D7. If you used different Arduino pins, change the corresponding values in the constructor. lcd.begin(16, 2) sets the display dimensions. lcd.print() writes text, and lcd.setCursor(0, 1) places the cursor at the first column of the second row; both coordinates start at zero. In this sketch, the second row shows the number of seconds since the board started.
Troubleshoot a blank or incorrect display
- Check power and ground. Verify the module’s VSS, VCC, and ground connections against its documentation.
- Match the sketch to the wiring. Confirm RS, Enable, and each D4–D7 wire goes to the Arduino pin listed in the constructor.
- Adjust contrast. Turn the potentiometer connected to VO; an unsuitable contrast setting can make text hard to see.
- Check the display dimensions. Use
lcd.begin(16, 2)for a 16-column, two-row display. - Check the interface. If the display has an I2C backpack, follow its documented wiring and software instructions instead of this parallel pin map.
- Consult the module details for its backlight. The Arduino example does not specify universal backlight voltage, current, or resistor requirements.
Optional: turn the display output off and on
Arduino’s separate Display example demonstrates lcd.noDisplay() and lcd.display() to switch visible output off and on.
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Quick Recap
Best Value
- ALL-IN-ONE DISPLAY & KEYPAD MODULE: This 1602 LCD Keypad Shield combines a 16x2 character LCD display with built-in navigation buttons (select, up, down, left, right), offering an easy-to-use interface for Arduino Uno R3/R4 and Mega boards—perfect for interactive projects, sensor monitoring, and menu navigation.
- 2-PACK FOR DOUBLE THE CREATIVITY: Includes two LCD keypad shields for Arduino, ideal for prototyping multiple Arduino projects at once. Great value for electronics hobbyists, students, and professional developers.
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- CLEAR & BRIGHT 1602 LCD DISPLAY: Features a high-contrast LCD screen with two rows and sixteen characters, providing crisp and easy-to-read output for real-time data, menus, and system feedback in any lighting condition.
- FREE ONLINE TUTORIAL AVAILABLE: Get started quickly with our helpful online guide. Just search “DIYables LCD Keypad Shield” to access step-by-step instructions, example codes, and project ideas designed to support both new learners and experienced makers.
Rank #4
- LCD 1602 screen: This module can display 2 lines of characters, with 16 characters per line
- I2C / IIC interface: Saves a lot of ports compared to parallel interface (This new model integrates the conversion circuit, making it more stable)
- Compatible models: Compatible with mainstream models of Arduino / Raspberry Pi / Raspberry Pi Pico / ESP32, provide example projects and code (Other controllers are also compatible but do not provide examples)
- Tutorial and code: Example projects for mainstream controllers (The tutorial link can be found on the product box, no paper tutorial)
- Get support: Our technical support team is always ready to answer your questions
Rank #3
- EASY I2C WIRING & SETUP: Simplify your projects with the I2C serial interface, requiring only four connections: VCC, GND, SDA, and SCL. This significantly reduces wiring complexity compared to parallel LCDs, making it ideal for both beginners and advanced users looking for a quick and clean setup.
- CRISP 16X2 CHARACTER DISPLAY: Features a clear display capable of showing 2 lines of 16 characters each, perfect for displaying sensor data, status messages, or user menus. The vibrant blue backlight ensures excellent readability in various lighting conditions.
- BROAD MICROCONTROLLER COMPATIBILITY: Engineered for versatility, this LCD module works seamlessly with a wide range of popular development boards. It is fully compatible with Arduino, Raspberry Pi, Tinkerboard, Nano pi, Banana pi, stm32, and other common microcontrollers.
- ADJUSTABLE BACKLIGHT AND CONTRAST: Easily fine-tune the display's readability using the built-in potentiometer on the rear of the module. This allows you to adjust the backlight brightness and character contrast to achieve the perfect viewing angle and clarity for your specific application.
- VERSATILE FOR DIY & STEM PROJECTS: An essential component for a variety of applications, including Internet of Things (IoT) devices, school electronics projects, smart building dashboards, and custom DIY maker projects. We provide comprehensive after-sales support: complete digital documentation including user guides and technical references is available through our store customer service, and our support team is ready to assist with installation, programming, and troubleshooting to help you get started quickly.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
