2004 Serial LCD Module Display SKU:Z-0235

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2004 Serial LCD Module Display[edit]

LCD2004 02.jpg

Description[edit]

The LCD has always been a device that acts as a window in human-computer interaction.
For example, the prompt window on some instrument devices, the temperature and humidity prompt box,
the device running status monitor, and the prompt screen of the counting device all have LCD figures.
The common LCD1602, LCD2004, and LCD12864 are fabricated using liquid crystal materials and communicated using the I2C bus.
It is a high-performance serial bus with bus rules and high-speed or low-speed device synchronization required for multi-master systems.
The I2C bus has only two bidirectional signal lines, a serial data line (SDA) and a serial clock line (SCL).
Compatible with all devices with I2C interfaces, such as Arduino, raspberry pi, beagle bone black, tinker board, stm32, esp32 and more.

Features[edit]

  • 20 Characters * 4 Lines, Character LCD module
  • Blue Backlight
  • 5V for Logic Circuit
  • Low power consumption
  • Support I2C protocol
  • Easy to use
  • Compatible with Raspberry Pi, banana Pi, Tinker Board, STM32, ESP32 etc.
  • Type: Chip On Board
  • Number of Data line: 8-bit parallel

Gallery[edit]

LCD2004 01-2.jpg
LCD2004 06.jpg
LCD2004 05.jpg
LCD2004 07-2.jpg
20190410112907.jpg
20190410112912.jpg

Package Include[edit]

  • 1 x LCD2004
  • 4 x Jumpwire
LCD2004 05.jpg


How to assemble it to Raspberry Pi[edit]

  • LCD2004 communicates with Raspberry Pi via I2C protocol.
  • Connect LCD2004 module to Raspberry Pi as following picture:

I2C LCD2004 Raspberry Pi
GND GND
VCC 5V
SDA SDA
SCL SCL
LCDGPIO.png
Rpidemo2.png


Demo code[edit]

  • Raspberry Pi

1. Connect LCD2004 to Raspberry Pi's I2C Pins via jumpwire
2. Open a terminal and typing following command:
sudo apt-get update
sudo apt-get upgrade

3. Enable I2C function.
sudo raspi-config
Navigate to "Interface Option" and select "i2c" and enable it.
4.Download and install python-liquidcrystal_i2c library.
Download python-liquidcrystal_i2c/archive/master.zip and install it to Raspberry Pi as following command:
python -m easy_install --user https://github.com/pl31/python-liquidcrystal_i2c/archive/master.zip

  • Second way to install library.

Or you can download it from here: [ http://wiki.52pi.com/index.php/File:Python-liquidcrystal_i2c-master.zip ]
Using python -m easy_install --user Python-liquidcrystal_i2c-master.zip to install it.
5. Write demo code and test it.
Copy and paste following code to a file named lcd2004.py:

#!/usr/bin/env python
"""first please add python library via this command: python -m easy_install --user https://github.com/pl31/python-liquidcrystal_i2c/archive/master.zip """
import socket
import os.path
import sys
import struct
import fcntl
import os
import time
import liquidcrystal_i2c
efg = "0"
wfg = "0"
lcd = liquidcrystal_i2c.LiquidCrystal_I2C(0x27, 1, numlines=4)
PATH1="/sys/class/net/eth0/carrier"
PATH2 = "/sys/class/net/wlan0/carrier"
def getserial():
    snm = "0000000000000000"
    try:
        f = open('/proc/cpuinfo','r')
        for line in f:
            if line[0:6]=='Serial':
                snm = line[10:26]
        f.close()
    except:
        snm = "ERROR"
    return snm

def getip(ifname):
    tt=0
    while tt<100:
        try:
            s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
            return socket.inet_ntoa(fcntl.ioctl(s.fileno(),0x8915,struct.pack('256s',ifname[:15]))[20:24])
        except:
            tt+=1
            time.sleep(1)
            if(tt>99):
                return('ERROR')
time.sleep(15)
pstr= 'SN:'+getserial()
lcd.printline(0,pstr)
pstr = 'HN:'+socket.gethostname()
lcd.printline(1,pstr)
if os.path.isfile(PATH1) and os.access(PATH1, os.R_OK):
    efg = open(PATH1).read()
    pstr = 'EM:'+open('/sys/class/net/eth0/address').read()
    pstr = pstr.strip('\n')
    lcd.printline(2,pstr)
    if efg[0]=="1":
        pstr='EIP:'+str(getip('eth0'))
        lcd.printline(3,pstr)
    elif os.path.isfile(PATH2) and os.access(PATH2, os.R_OK):
        wfg = open(PATH2).read()
        pstr="WM:"+open('/sys/class/net/wlan0/address').read()
        pstr = pstr.strip('\n')
        lcd.printline(2,pstr)
        if wfg[0]=="1":
            pstr="WIP:"+str(getip('wlan0'))
            lcd.printline(3,pstr)

6. Test it
save it and run it.
python lcd2004.py
You will see your Raspberry Pi's Serial Number, Hostname, WiFi Mac address and WiFi IP address.

Lcd2004 demo1.jpg


  • Arduino

1. Connect LCD2004 to Arduino Uno:

Arduinowire.jpg


2. Download library from boardmanager and install following library:

Arduinolib.png


3. Build Sketch file and upload to your Arduino Uno.
Open your Arduino IDE and then copy paste following code and select your port and the type of your board, press upload icon to upload sketch.

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display

void setup()
{
  lcd.init();                      // initialize the lcd 
  lcd.init();
  // Print a message to the LCD.
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("--------------------");
  lcd.setCursor(6,1);
  lcd.print("GEEEKPI");
   lcd.setCursor(1,2);
  lcd.print("Arduino IIC Screen");
   lcd.setCursor(0,3);
  lcd.print("--------------------");
}

void loop()
{
// Just loop, do nothing. 
}

4. Connect Arduino to PC via USB cable, you will see:

Lcd2004demo2.jpg


Keywords[edit]

LCD2004, liquid crystal Display, Raspberry Pi display, i2c protocol display, LCD