I2C IIC LCD Serial Interface Adapter Module for 1602 Character Display
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৳ 100.00৳ 150.00 (-33%)
This I2C/IIC Serial Interface Adapter Module is a high-utility, space-saving board designed to radically simplify how you connect character displays to your microcontrollers. [1]
Standard HD44780-based displays (like the 1602 LCD) normally consume up to 16 digital I/O pins, leaving very few pins available for other sensors or components. Powered by the robust PCF8574 Remote 8-Bit I/O Expander chip, this backpack adapter converts that bulky parallel connection into a streamlined, 2-wire serial I2C stream (SDA and SCL). This cuts down your microcontroller’s pin usage down to just 2 lines, eliminating messy wiring nightmares on your breadboard. [1, 2, 3, 4, 5, 6, 7, 8]
Technical Specifications
- Chipset: PCF8574T or PCF8574AT I/O Expander
- Operating Voltage: 5V DC (compatible with 5V logic microcontrollers)
- Default I2C Address: 0x27 or 0x3F (depending on the specific IC variant batch)
- Adjustable Address Range: 0x20 to 0x27 or 0x38 to 0x3F
- Display Compatibility: Standard 16×2 (1602) and 20×4 (2004) character LCD modules
- Onboard Features: Contrast potentiometer, power LED indicator, and backlight jumper
- Dimensions: Approximately 41.6mm x 19.2mm [1, 2, 6, 7, 9, 10, 11, 12, 13]
Key Product Features
- Dramatic Pin Savings: Saves up to 12 digital I/O lines on development boards, ensuring plenty of space for other hardware modules. [1]
- Configurable Slave Bus: Features 3 hardware address solder pads (A0, A1, A2). By shorting these pads, you can configure up to 8 unique addresses, allowing up to 8 separate LCD modules to share a single I2C bus simultaneously. [5, 14]
- Integrated Contrast Tuning: Features an integrated blue 10K precision trimmer potentiometer to adjust the contrast of your screen directly, removing the need to wire up external resistors. [8, 9]
- Flexible Backlight Toggle: Includes a black pin jumper cap that allows you to easily cut off or supply power to the LED backlight programmatically or mechanically. [13, 15]
- Seamless Form Factor: The 16 male header pins on top of the module align with the standard pins of a 1602 LCD, making it easy to solder onto the back of the screen like a component daughterboard. [13, 16]
Interface Pinout Configuration
- GND: System Ground
- VCC: 5V Power Supply Input
- SDA: Serial Data Line (Connects to your MCU’s I2C data pin)
- SCL: Serial Clock Line (Connects to your MCU’s I2C clock pin) [2, 6]
If you need any adjustments, let me know:
- If you want a section explaining how to find the I2C address using code
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