1602 lcd WITH I2C MODULE – KSH 450 at HIMASTORES Mombasa – best electronics in Kenya
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1602 lcd WITH I2C MODULE

SKU: HMJ103 Category: Displays
KSH 450.00
In Stock

Product Description

1602 LCD Display Module with I2C Interface

16x2 Serial Display for Arduino and Microcontroller Projects

The 1602 LCD with I2C module is a 16character by 2line display that uses an I2C serial interface for communication. A small "backpack" adapter board on the back converts the standard 16pin parallel interface to a simple 4wire connection (VCC, GND, SDA, SCL), saving valuable GPIO pins for other project needs.

4Wire Connection Uses only VCC, GND, SDA, and SCL pins, saving up to 7-9 GPIO pins compared to the parallel version
Onboard Contrast Adjustment Blue potentiometer on the back for finetuning display visibility
The I2C address is typically 0x27 or 0x3F depending on the adapter chip version [citation:4]. Use an I2C scanner sketch to confirm the address.
The module operates on 3.3V to 5V, making it compatible with both 3.3V and 5V logic systems [citation:3].
For Arduino Uno/Nano, connect SDA to A4 and SCL to A5; for Arduino Mega, SDA to pin 20 and SCL to pin 21 [citation:8][citation:11].

Technical Specifications

ParameterValue
Display Format16 characters x 2 lines
CommunicationI2C (SDA, SCL)
Default I2C Address0x27 (common) or 0x3F (NXP chip) [citation:4]
Operating Voltage3.3V to 5V [citation:3][citation:7]
Backlight ColorBlue with white characters (other colors available)
Contrast AdjustmentOnboard potentiometer
Compatible LibrariesLiquidCrystal_I2C for Arduino

= Key Features =

+Simplified Wiring Only 4 pins required (VCC, GND, SDA, SCL) vs 611 pins for parallel version

+Onboard I2C Adapter Presoldered PCF8574 or AiP31068 chip with pull-up resistors [citation:4]

+Adjustable Contrast Potentiometer for finetuning character visibility

+Backlight Control - Programmable on/off via software using "technical">lcd.backlight() and "technical">lcd.noBacklight() [citation:8]

+Supports Custom Characters CGRAM allows creation of userdefined symbols and characters

= Applications =

  1. Displaying sensor data (temperature, humidity, distance)
  2. Menu and user interface for embedded projects
  3. Status and message display for Arduino devices
  4. Data logging and monitoring systems
  5. Time, date, and alarm display
Easy GPIO Saving - Perfect for projects with multiple sensors or peripherals where every pin counts
PlugandPlay Simple 4wire connection with standard library support

√ Compatible with Arduino, ESP8266, ESP32, and Raspberry Pi Pico [citation:3]

√ Works with the popular LiquidCrystal_I2C library in Arduino IDE

√ Backlight can be dimmed using PWM or software control [citation:7]

Connection Guide (Arduino Uno/Nano)

Module PinArduino PinFunction
VCC5VPower supply
GNDGNDGround
SDAA4I2C data line
SCLA5I2C clock line

For other boards [citation:8][citation:11]:

  • Arduino Mega: SDA → Pin 20, SCL → Pin 21
  • ESP32: SDA → GPIO21, SCL → GPIO22
  • WeMOS D1 Mini (ESP8266): SDA → D2, SCL → D1

Troubleshooting

No display visible:

  • Adjust the blue potentiometer on the back to set proper contrast [citation:1][citation:7]
  • Verify the correct I2C address (0x27 or 0x3F) [citation:4]
  • Check VCC (5V) and GND connections

Garbled or missing characters:

  • Ensure "technical">lcd.init() is called before "technical">lcd.backlight() in setup()
  • Verify the correct library is installed (LiquidCrystal_I2C by Frank de Brabander)
  • Check wiring: SDA to SDA, SCL to SCL (not swapped)

Backlight not turning on:

  • Use lcd.backlight() command after initialization [citation:8]
  • Check if the backlight jumper on the adapter board is connected