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I2C LCD Adapter Board (PCF8574) – 16×2 / 20×4

5V power supply.
Serial I2C control of LCD display using PCF8574.
Backlight can be enabled or disabled via a jumper on the board.
Contrast control via a potentiometer.
Can have 8 modules on a single I2C bus (change address via solder jumpers)address, allowing.

SKU: AA134 Categories: Electronic Modules, USB Interface Module

60,00 EGP

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I2C LCD Adapter Board (PCF8574) – 16×2 / 20×4

60,00 EGP

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Description

This is a RoHS compliant I2C Serial LCD Daughter board that can be connected to a standard 16×2 or 20×4 Character Display Module that supports 4-bit mode. All Character Modules sold on our site support 4-bit mode, and nearly all commercially available 16×2 and 20×4 line character modules support it too.

This board has a PCF8574 I2C chip that converts I2C serial data to parallel data for the LCD display. There are many examples on the internet for using this board with Arduino. Do a search for “Arduino LCD PCF8574“. The I2C address is 0x3F by default, but this can be changed via 3 solder jumpers provided on the board. This allows up to 3 LCD displays to be controlled via a single I2C bus (giving each one it’s own address)

Specifications and Features:

5V power supply.
Serial I2C control of LCD display using PCF8574.
Backlight can be enabled or disabled via a jumper on the board.
Contrast control via a potentiometer.
Can have 8 modules on a single I2C bus (change address via solder jumpers)address, allowing.
Size ：41.6 x 19.2 mm.

Package Includes:

1 x IIC/I2C Serial Interface Adapter Module

🔌

Pin Connections

1 Table

Pin Connections Table 1

Board Name	PCF8574 I2C LCD	Connection Details (Voltage Notes)
Arduino Uno	PCF8574	VCC->5V, GND->GND, SDA->A4, SCL->A5. 5V logic, direct connection.
Arduino Nano	PCF8574	VCC->5V, GND->GND, SDA->A4, SCL->A5. 5V logic, direct connection.
Arduino Mega	PCF8574	VCC->5V, GND->GND, SDA->20, SCL->21. 5V logic, direct connection.
ESP32	PCF8574	VCC->5V (VIN), GND->GND, SDA->21, SCL->22. 3.3V logic; use level shifter (e.g., TXB0108) on SDA/SCL lines. Alternatively, power PCF8574 at 3.3V if LCD supports it.
ESP8266	PCF8574	VCC->5V (VIN), GND->GND, SDA->4 (D2), SCL->5 (D1). 3.3V logic; level shifter recommended.
STM32	PCF8574	VCC->5V (VBUS), GND->GND, SDA->PB7, SCL->PB6 (default). 3.3V logic; level shifter recommended.
Raspberry Pi Pico	PCF8574	VCC->5V (VBUS), GND->GND, SDA->0 (I2C0), SCL->1 (I2C0). 3.3V logic; level shifter recommended.

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I2C LCD Adapter (PCF8574) 16x2/20x4

7 Examples • C/C++ | Boards: Arduino Uno, Arduino Nano, Arduino Mega, ESP32, ESP8266, STM32, Raspberry Pi Pico

Wrap Dark

I2C LCD - Arduino Uno

I2C LCD - Arduino Nano

I2C LCD - Arduino Mega

I2C LCD - ESP32

I2C LCD - ESP8266

I2C LCD - STM32

I2C LCD - Raspberry Pi Pico

Code Comments:

Code for Arduino Uno with 16x2 LCD via PCF8574

📄 File: i2c_lcd_-_arduino_uno_arduino_uno.inoArduino Uno

890 characters

1/*

2 * ekostra.com

3 * ekostra electronics store in egypt

4 */

6#include <Wire.h>

7#include <LiquidCrystal_I2C.h>

9// Set the LCD address (commonly 0x27 or 0x3F)

10#define LCD_ADDR 0x27

11// Define LCD dimensions (change to 20,4 if using 20x4)

12#define LCD_COLS 16

13#define LCD_ROWS 2

15// Create LCD objectnLiquidCrystal_I2C lcd(LCD_ADDR, LCD_COLS, LCD_ROWS);

17void setup() {

18 // Initialize serial monitor for debuggingn Serial.begin(115200);

20 // Initialize I2C (default pins A4/A5 for Uno)

21 Wire.begin();

23 // Initialize LCDn lcd.init();

24 // Turn on backlightn lcd.backlight();

25 // Clear screenn lcd.clear();

27 // Print welcome messagen lcd.setCursor(0, 0);

28 lcd.print("Hello, World!");

29 lcd.setCursor(0, 1);

30 lcd.print("Count: ");

31}

33void loop() {

34 static int count = 0;

35 // Display counter at column 7, row 1

36 lcd.setCursor(7, 1);

37 lcd.print(count);

38 delay(1000);

39 count++;

40}

Code Comments:

Code for Arduino Nano with 16x2 LCD via PCF8574

📄 File: i2c_lcd_-_arduino_nano_arduino_nano.inoArduino Nano

891 characters

1/*

2 * ekostra.com

3 * ekostra electronics store in egypt

4 */

6#include <Wire.h>

7#include <LiquidCrystal_I2C.h>

9// Set the LCD address (commonly 0x27 or 0x3F)

10#define LCD_ADDR 0x27

11// Define LCD dimensions (change to 20,4 if using 20x4)

12#define LCD_COLS 16

13#define LCD_ROWS 2

15// Create LCD objectnLiquidCrystal_I2C lcd(LCD_ADDR, LCD_COLS, LCD_ROWS);

17void setup() {

18 // Initialize serial monitor for debuggingn Serial.begin(115200);

20 // Initialize I2C (default pins A4/A5 for Nano)

21 Wire.begin();

23 // Initialize LCDn lcd.init();

24 // Turn on backlightn lcd.backlight();

25 // Clear screenn lcd.clear();

27 // Print welcome messagen lcd.setCursor(0, 0);

28 lcd.print("Hello, World!");

29 lcd.setCursor(0, 1);

30 lcd.print("Count: ");

31}

33void loop() {

34 static int count = 0;

35 // Display counter at column 7, row 1

36 lcd.setCursor(7, 1);

37 lcd.print(count);

38 delay(1000);

39 count++;

40}

Code Comments:

Code for Arduino Mega with 16x2 LCD via PCF8574

📄 File: i2c_lcd_-_arduino_mega_arduino_mega.inoArduino Mega

891 characters

1/*

2 * ekostra.com

3 * ekostra electronics store in egypt

4 */

6#include <Wire.h>

7#include <LiquidCrystal_I2C.h>

9// Set the LCD address (commonly 0x27 or 0x3F)

10#define LCD_ADDR 0x27

11// Define LCD dimensions (change to 20,4 if using 20x4)

12#define LCD_COLS 16

13#define LCD_ROWS 2

15// Create LCD objectnLiquidCrystal_I2C lcd(LCD_ADDR, LCD_COLS, LCD_ROWS);

17void setup() {

18 // Initialize serial monitor for debuggingn Serial.begin(115200);

20 // Initialize I2C (default pins 20/21 for Mega)

21 Wire.begin();

23 // Initialize LCDn lcd.init();

24 // Turn on backlightn lcd.backlight();

25 // Clear screenn lcd.clear();

27 // Print welcome messagen lcd.setCursor(0, 0);

28 lcd.print("Hello, World!");

29 lcd.setCursor(0, 1);

30 lcd.print("Count: ");

31}

33void loop() {

34 static int count = 0;

35 // Display counter at column 7, row 1

36 lcd.setCursor(7, 1);

37 lcd.print(count);

38 delay(1000);

39 count++;

40}

Code Comments:

Code for ESP32 with 16x2 LCD via PCF8574 – level shifter required for 5V I2C

📄 File: i2c_lcd_-_esp32_esp32.inoESP32

977 characters

1/*

2 * ekostra.com

3 * ekostra electronics store in egypt

4 */

6#include <Wire.h>

7#include <LiquidCrystal_I2C.h>

9// Set the LCD address (commonly 0x27 or 0x3F)

10#define LCD_ADDR 0x27

11// Define LCD dimensions (change to 20,4 if using 20x4)

12#define LCD_COLS 16

13#define LCD_ROWS 2

15// ESP32 I2C pins (default: SDA=21, SCL=22)

16#define I2C_SDA 21

17#define I2C_SCL 22

19// Create LCD objectnLiquidCrystal_I2C lcd(LCD_ADDR, LCD_COLS, LCD_ROWS);

21void setup() {

22 // Initialize serial monitor for debuggingn Serial.begin(115200);

24 // Initialize I2C with custom pinsn Wire.begin(I2C_SDA, I2C_SCL);

26 // Initialize LCDn lcd.init();

27 // Turn on backlightn lcd.backlight();

28 // Clear screenn lcd.clear();

30 // Print welcome messagen lcd.setCursor(0, 0);

31 lcd.print("Hello, World!");

32 lcd.setCursor(0, 1);

33 lcd.print("Count: ");

34}

36void loop() {

37 static int count = 0;

38 // Display counter at column 7, row 1

39 lcd.setCursor(7, 1);

40 lcd.print(count);

41 delay(1000);

42 count++;

43}

Code Comments:

Code for ESP8266 with 16x2 LCD via PCF8574 – level shifter recommended

📄 File: i2c_lcd_-_esp8266_esp8266.inoESP8266

980 characters

1/*

2 * ekostra.com

3 * ekostra electronics store in egypt

4 */

6#include <Wire.h>

7#include <LiquidCrystal_I2C.h>

9// Set the LCD address (commonly 0x27 or 0x3F)

10#define LCD_ADDR 0x27

11// Define LCD dimensions (change to 20,4 if using 20x4)

12#define LCD_COLS 16

13#define LCD_ROWS 2

15// ESP8266 I2C pins (SDA=GPIO4/D2, SCL=GPIO5/D1)

16#define I2C_SDA 4

17#define I2C_SCL 5

19// Create LCD objectnLiquidCrystal_I2C lcd(LCD_ADDR, LCD_COLS, LCD_ROWS);

21void setup() {

22 // Initialize serial monitor for debuggingn Serial.begin(115200);

24 // Initialize I2C with custom pinsn Wire.begin(I2C_SDA, I2C_SCL);

26 // Initialize LCDn lcd.init();

27 // Turn on backlightn lcd.backlight();

28 // Clear screenn lcd.clear();

30 // Print welcome messagen lcd.setCursor(0, 0);

31 lcd.print("Hello, World!");

32 lcd.setCursor(0, 1);

33 lcd.print("Count: ");

34}

36void loop() {

37 static int count = 0;

38 // Display counter at column 7, row 1

39 lcd.setCursor(7, 1);

40 lcd.print(count);

41 delay(1000);

42 count++;

43}

Code Comments:

Code for STM32 (Blue Pill) with 16x2 LCD via PCF8574 – level shifter recommended

📄 File: i2c_lcd_-_stm32_stm32.inoSTM32

990 characters

1/*

2 * ekostra.com

3 * ekostra electronics store in egypt

4 */

6#include <Wire.h>

7#include <LiquidCrystal_I2C.h>

9// Set the LCD address (commonly 0x27 or 0x3F)

10#define LCD_ADDR 0x27

11// Define LCD dimensions (change to 20,4 if using 20x4)

12#define LCD_COLS 16

13#define LCD_ROWS 2

15// STM32 (Blue Pill) default I2C pins: SDA=PB7, SCL=PB6

16// We'll use default Wire.begin() without argumentsnn// Create LCD objectnLiquidCrystal_I2C lcd(LCD_ADDR, LCD_COLS, LCD_ROWS);

18void setup() {

19 // Initialize serial monitor for debuggingn Serial.begin(115200);

21 // Initialize I2C (uses default pins)

22 Wire.begin();

24 // Initialize LCDn lcd.init();

25 // Turn on backlightn lcd.backlight();

26 // Clear screenn lcd.clear();

28 // Print welcome messagen lcd.setCursor(0, 0);

29 lcd.print("Hello, World!");

30 lcd.setCursor(0, 1);

31 lcd.print("Count: ");

32}

34void loop() {

35 static int count = 0;

36 // Display counter at column 7, row 1

37 lcd.setCursor(7, 1);

38 lcd.print(count);

39 delay(1000);

40 count++;

41}

Code Comments:

Code for Raspberry Pi Pico with 16x2 LCD via PCF8574 – level shifter recommended

📄 File: i2c_lcd_-_raspberry_pi_pico_raspberry_pi_pico.inoRaspberry Pi Pico

980 characters

1/*

2 * ekostra.com

3 * ekostra electronics store in egypt

4 */

6#include <Wire.h>

7#include <LiquidCrystal_I2C.h>

9// Set the LCD address (commonly 0x27 or 0x3F)

10#define LCD_ADDR 0x27

11// Define LCD dimensions (change to 20,4 if using 20x4)

12#define LCD_COLS 16

13#define LCD_ROWS 2

15// Raspberry Pi Pico I2C0 pins: SDA=GP0, SCL=GP1

16#define I2C_SDA 0

17#define I2C_SCL 1

19// Create LCD objectnLiquidCrystal_I2C lcd(LCD_ADDR, LCD_COLS, LCD_ROWS);

21void setup() {

22 // Initialize serial monitor for debuggingn Serial.begin(115200);

24 // Initialize I2C with custom pinsn Wire.begin(I2C_SDA, I2C_SCL);

26 // Initialize LCDn lcd.init();

27 // Turn on backlightn lcd.backlight();

28 // Clear screenn lcd.clear();

30 // Print welcome messagen lcd.setCursor(0, 0);

31 lcd.print("Hello, World!");

32 lcd.setCursor(0, 1);

33 lcd.print("Count: ");

34}

36void loop() {

37 static int count = 0;

38 // Display counter at column 7, row 1

39 lcd.setCursor(7, 1);

40 lcd.print(count);

41 delay(1000);

42 count++;

43}

Project Notes:

Example project for driving a 16x2 or 20x4 LCD with PCF8574 I2C backpack on multiple boards. Includes voltage level shifting guidance for 3.3V boards.

Required Libraries:

LiquidCrystal_I2CGitHub

[acf_vc_integrator get_field_data_from="" field_group="25154" field_from_25154="field_694d5bea250d3" show_label="default" align="default" gallery_columns="" gm_show_placecard="default" gm_map_type_control="default" gm_fullscreen_control="default" gm_street_view_control="default" gm_zoom_control="default" gm_scale="default" hidden_field_name="ARDUINO CODE"]

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Specification

General

WeightWeight	4,0000 g
Dimensions	42 × 20 cm
Type	I2C Serial LCD Interface Adapter
Compatible LCD Size	16×2 / 20×4 Character LCD
LCD Mode	4-bit Mode
Controller IC	PCF8574
Communication Interface	I2C
Operating Voltage	5V
Default I2C Address	0x3F
Address Selection	Via 3 Solder Jumpers
Maximum Devices on I2C Bus	Up to 8 Modules
Backlight Control	Jumper Enabled / Disabled
Contrast Adjustment	On-board Potentiometer
RoHS Compliance	Yes
Application	Arduino and Microcontroller Projects
الأبعاد	41.6×19.2×8 (mm) مم (الطول: 4.16 سم، العرض: 1.92 سم، الارتفاع: 0.8 سم)
الوزن	5 جرام (0.005 كجم)
Package Includes	1 x I2C Serial Interface Adapter Module