Electronics

LCD I2C Adapter Board PCF8574 For 1602 2004 16x2 20x4

AED 14.20

1

Description

The PCF8574 I2C Serial for LCD boards is designed to enhance the functionality of 16x2 or 20x4 Character Display Modules that support 4-bit mode and are compatible with the HD44780 interface. With its I2C serial data conversion capabilities, this board simplifies the process of connecting and controlling LCDs.

 

Features:

  • I2C Compatibility: Enables easy interfacing with various microcontrollers and devices.
  • Address Customization: Three solder jumpers allow modification of the I2C address, facilitating the management of up to three LCD screens using a single I2C connection (with 3 modules).
  • 5V Operation: Operates at a standard 5-volt power supply voltage for compatibility with common electronic systems.
  • Backlight Control: Features a jumper for convenient backlight management, allowing control over the display's illumination.
  • Contrast Adjustment: Incorporates a potentiometer for precise contrast adjustment, ensuring optimal visibility of displayed information.
  • Compact Design: Boasts a compact size of 41.6mm x 19.2mm, suitable for space-constrained projects.

 

Specifications:

  • Operating Voltage: 5 volts
  • I2C Compatibility: Utilizes PCF8574 for serial I2C communication with LCD displays.
  • Backlight Control: Includes a jumper on the PCB for easy backlight management.
  • Contrast Adjustment: Features a potentiometer for contrast control.
  • Multiple Modules: Supports connection of up to 4 modules on a single I2C bus, with the flexibility to change addresses using solder jumpers.
  • Dimensions: Compact board size measuring 41.6mm x 19.2mm.

 

Pinout:

Pin Number Description
1 GND
2 VCC (5V)
3 SDA (I2C Data)
4 SCL (I2C Clock)

 

How the Module Works:

The PCF8574 I2C Serial for LCD boards facilitates the connection and control of LCDs through I2C communication. It integrates seamlessly with microcontrollers and devices, offering customization options such as address modification and backlight control. The inclusion of a potentiometer enables precise contrast adjustment, ensuring optimal display visibility. With its compact design, it is suitable for various space-constrained projects.

The A0, A1, and A2 jumpers on the PCF8574 I2C Serial for LCD board are used to customize the I2C address of the board. By default, the I2C address is set to 0x27. However, if you need to use multiple PCF8574 boards on the same I2C bus, you must ensure that each board has a unique address to avoid conflicts.

How to use the A0, A1, and A2 jumpers:

  • Default Address (No Jumper Installed): If no jumper is installed on any of the A0, A1, or A2 pins, the default I2C address 0x27 is used.
  • Customizing the Address: You can customize the I2C address by installing jumpers on the A0, A1, and A2 pins in different combinations. Each jumper can be either connected (jumper installed) or disconnected (jumper removed), allowing for a total of eight unique address combinations.
    • A0, A1, A2 All Disconnected: Address = 0x27 (Default)
    • A0 Connected: Address = 0x26
    • A1 Connected: Address = 0x25
    • A2 Connected: Address = 0x23
    • A0, A1 Connected: Address = 0x24
    • A0, A2 Connected: Address = 0x22
    • A1, A2 Connected: Address = 0x21
    • A0, A1, A2 All Connected: Address = 0x20
  • Setting Multiple Boards with Different Addresses: If you have multiple PCF8574 boards and want to use them simultaneously on the same I2C bus, ensure that each board has a unique address. You can achieve this by configuring the A0, A1, and A2 jumpers differently on each board.
  • Solder Jumpers: To install or remove jumpers, you may need to solder or desolder the jumper connections on the board. Carefully solder or desolder the connections as per your desired address configuration.

Connecting with Arduino Uno:

To connect the PCF8574 I2C Serial for LCD board with an Arduino Uno, follow these steps:

  1. Connect the GND pin of the PCF8574 board to the GND pin on the Arduino Uno.
  2. Connect the VCC (5V) pin of the PCF8574 board to the 5V pin on the Arduino Uno.
  3. Connect the SDA (I2C Data) pin of the PCF8574 board to the A4 pin on the Arduino Uno.
  4. Connect the SCL (I2C Clock) pin of the PCF8574 board to the A5 pin on the Arduino Uno.

 

Package Includes:

  • 1 x PCF8574 I2C Serial for LCD board