8X2 LCD module - Green Documentation

Component Name

8X2 LCD Module - Green

Overview

The 8X2 LCD Module - Green is a compact and versatile liquid crystal display (LCD) module designed for a wide range of applications in the Internet of Things (IoT) and embedded systems. This module features a 2-line, 8-character display with a green backlight, making it suitable for displaying text and numeric data in various environments.

Functionality

The 8X2 LCD Module - Green is a character-based display module that can display alphanumeric data, including letters, numbers, and symbols. It is designed to be controlled by a microcontroller or other computing devices, allowing users to send data to the module to be displayed on the LCD screen. The module operates on a 5V power supply and communicates with the control device using a serial interface.

Key Features

Display Specifications:

Display Type

STN (Super-Twist Nematic) LCD

Display Mode

Reflective, Transmissive, or Transflective

Display Size

2 lines x 8 characters

Character Size

5x8 dot matrix

Character Set

English, Japanese, and European characters

Backlight:

Color

Green

Type

LED backlight

Brightness

Adjustable via external resistor

Interface:

Communication Protocol

Serial (UART)

Interface Type

1x4-pin or 1x6-pin single-row connector

Data Transfer Rate

Up to 9600 bps

Power Supply:

Operating Voltage

4.5V to 5.5V

Power Consumption

Typically 5mA (without backlight), 50mA (with backlight)

Physical Characteristics:

Module Size

78.5mm x 24.5mm x 12.5mm

Weight

Approximately 20 grams

Mounting Options

Through-hole or SMT

Operating Conditions:

Operating Temperature

-20C to 70C

Storage Temperature

-30C to 80C

Humidity

5% to 95% RH (non-condensing)

Applications

The 8X2 LCD Module - Green is suitable for a wide range of applications, including

IoT devices

Industrial control systems

Medical devices

Automotive systems

Home automation systems

Robotics and automation

Consumer electronics

Technical Documents

For more detailed information, please refer to the following technical documents

Datasheet

8X2_LCDC_Module_Green_DS.pdf

Application Note

8X2_LCDC_Module_Green_AN.pdf

Schematic Diagram

8X2_LCDC_Module_Green_SD.pdf

Warranty and Support

The 8X2 LCD Module - Green is backed by a one-year limited warranty. For technical support, please contact our dedicated support team at [support@lcdmodule.com](mailto

support@lcdmodule.com).

Pin Configuration

8X2 LCD Module - Green
Pin Description
The 8x2 LCD module has 14 pins, which are used to control and display characters on the LCD screen. Here's a detailed explanation of each pin:
Pin 1: VSS (Ground)
Connection: Connect to the negative terminal of the power supply (GND) or the ground pin of the microcontroller.
Function: Provides a common ground reference for the LCD module.
Pin 2: VCC (Power Supply)
Connection: Connect to the positive terminal of the power supply (VCC) or the power pin of the microcontroller.
Function: Supplies power to the LCD module. Typically, a voltage of 5V is used.
Pin 3: VE (Contrast Adjustment)
Connection: Connect to a potentiometer or a voltage divider circuit to adjust the contrast of the LCD display.
Function: Adjusts the contrast of the LCD display to optimize the visibility of characters.
Pin 4: RS (Register Select)
Connection: Connect to a digital output pin of the microcontroller.
Function: Selects the type of data being written to the LCD module. A high level (logic 1) selects the data register, while a low level (logic 0) selects the instruction register.
Pin 5: RW (Read/Write)
Connection: Connect to a digital output pin of the microcontroller.
Function: Determines the operation mode of the LCD module. A high level (logic 1) enables read mode, while a low level (logic 0) enables write mode.
Pin 6: EN (Enable)
Connection: Connect to a digital output pin of the microcontroller.
Function: Enables or disables the LCD module. A high level (logic 1) enables the LCD module, while a low level (logic 0) disables it.
Pin 7: DB0 (Data Bit 0)
Connection: Connect to a digital output pin of the microcontroller.
Function: Carries the least significant bit (LSB) of the data being written to or read from the LCD module.
Pin 8: DB1 (Data Bit 1)
Connection: Connect to a digital output pin of the microcontroller.
Function: Carries the second least significant bit of the data being written to or read from the LCD module.
Pin 9: DB2 (Data Bit 2)
Connection: Connect to a digital output pin of the microcontroller.
Function: Carries the third least significant bit of the data being written to or read from the LCD module.
Pin 10: DB3 (Data Bit 3)
Connection: Connect to a digital output pin of the microcontroller.
Function: Carries the fourth least significant bit of the data being written to or read from the LCD module.
Pin 11: DB4 (Data Bit 4)
Connection: Connect to a digital output pin of the microcontroller.
Function: Carries the fifth least significant bit of the data being written to or read from the LCD module.
Pin 12: DB5 (Data Bit 5)
Connection: Connect to a digital output pin of the microcontroller.
Function: Carries the sixth least significant bit of the data being written to or read from the LCD module.
Pin 13: DB6 (Data Bit 6)
Connection: Connect to a digital output pin of the microcontroller.
Function: Carries the seventh least significant bit of the data being written to or read from the LCD module.
Pin 14: DB7 (Data Bit 7)
Connection: Connect to a digital output pin of the microcontroller.
Function: Carries the most significant bit (MSB) of the data being written to or read from the LCD module.
Connection Structure:
To connect the 8x2 LCD module to a microcontroller, follow these steps:
1. Connect VSS (Pin 1) to the ground pin of the microcontroller or the negative terminal of the power supply.
2. Connect VCC (Pin 2) to the power pin of the microcontroller or the positive terminal of the power supply.
3. Connect VE (Pin 3) to a potentiometer or a voltage divider circuit to adjust the contrast of the LCD display.
4. Connect RS (Pin 4), RW (Pin 5), and EN (Pin 6) to digital output pins of the microcontroller.
5. Connect DB0 (Pin 7) to DB7 (Pin 14) to digital output pins of the microcontroller.
Note: Make sure to connect the pins correctly to avoid damaging the LCD module or the microcontroller. Always refer to the datasheet of the specific microcontroller and LCD module for specific connection requirements.

Code Examples

8X2 LCD Module - Green Documentation

Overview

The 8x2 LCD module is a compact and widely used display component in IoT projects. This module features a 2-line, 8-character per line display with a green backlight, making it suitable for various applications such as status displays, debug messages, and user interfaces.

Pinout

The 8x2 LCD module has a standard 16-pin interface:

| Pin | Function |
| --- | --- |
| 1 | VSS (GND) |
| 2 | VCC (5V) |
| 3 | VE (Contrast Adjustment) |
| 4 | RS (Register Select) |
| 5 | R/W (Read/Write) |
| 6 | EN (Enable) |
| 7 | D0 (Data Bit 0) |
| 8 | D1 (Data Bit 1) |
| 9 | D2 (Data Bit 2) |
| 10 | D3 (Data Bit 3) |
| 11 | D4 (Data Bit 4) |
| 12 | D5 (Data Bit 5) |
| 13 | D6 (Data Bit 6) |
| 14 | D7 (Data Bit 7) |
| 15 | A (Anode for Backlight) |
| 16 | K (Cathode for Backlight) |

Code Examples

### Example 1: Basic Display using Arduino

In this example, we'll use the 8x2 LCD module to display a greeting message using an Arduino board.

Hardware Connection

Connect the LCD module to the Arduino board as follows:
	+ Pin 1 (VSS) -> GND
	+ Pin 2 (VCC) -> 5V
	+ Pin 4 (RS) -> Digital Pin 12
	+ Pin 5 (R/W) -> GND
	+ Pin 6 (EN) -> Digital Pin 11
	+ Pin 7-14 (D0-D7) -> Digital Pins 2-9
 Connect the potentiometer to Pin 3 (VE) to adjust the contrast.

Software Code
```cpp
#include <LiquidCrystal.h>

// Initialize the LCD module
LiquidCrystal_I2C lcd(0x27, 16, 2); // Replace with your LCD module's address

void setup() {
  lcd.init(); // Initialize the LCD
  lcd.backlight(); // Turn on the backlight
}

void loop() {
  lcd.setCursor(0, 0); // Set the cursor to the first row, first column
  lcd.print("Hello, World!"); // Print the greeting message
  delay(1000); // Wait for 1 second
  lcd.setCursor(0, 1); // Set the cursor to the second row, first column
  lcd.print("LCD Module Example"); // Print the second message
  delay(1000); // Wait for 1 second
}
```
### Example 2: Displaying Sensor Data using ESP32

In this example, we'll use the 8x2 LCD module to display temperature and humidity sensor data using an ESP32 board.

Hardware Connection

Connect the LCD module to the ESP32 board as follows:
	+ Pin 1 (VSS) -> GND
	+ Pin 2 (VCC) -> 5V
	+ Pin 4 (RS) -> GPIO 18
	+ Pin 5 (R/W) -> GND
	+ Pin 6 (EN) -> GPIO 19
	+ Pin 7-14 (D0-D7) -> GPIO 23-16
 Connect the temperature and humidity sensor (e.g., DHT11) to the ESP32 board according to the sensor's documentation.

Software Code
```cpp
#include <WiFi.h>
#include <DHT.h>
#include <LiquidCrystal_I2C.h>

// Initialize the LCD module
LiquidCrystal_I2C lcd(0x27, 16, 2); // Replace with your LCD module's address

// Initialize the temperature and humidity sensor
DHT dht;

void setup() {
  lcd.init(); // Initialize the LCD
  lcd.backlight(); // Turn on the backlight
  dht.begin(); // Initialize the sensor
}

void loop() {
  // Read temperature and humidity data from the sensor
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

// Clear the LCD display
  lcd.clear();

// Display the temperature data
  lcd.setCursor(0, 0); // Set the cursor to the first row, first column
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.println(" C");

// Display the humidity data
  lcd.setCursor(0, 1); // Set the cursor to the second row, first column
  lcd.print("Humidity: ");
  lcd.print(humidity);
  lcd.println(" %");

delay(1000); // Wait for 1 second
}
```
Note: Make sure to adjust the pin connections and code according to your specific hardware setup and requirements.