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You are here: Home » Running Multiple LCD Displays On One Arduino UNO

By Abhishek Ghosh August 23, 2018 2:39 am Updated on August 23, 2018

Running Multiple LCD Displays On One Arduino UNO

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Commonly we show example of getting started with LCD with one LCD and some sensor, like we have guide on Arduino Temperature & Humidity Sensor DHT 11 With LCD 1602A. We Can Easily Run Two to Four 16×2 LCDs On Arduino UNO. In This Article, We Will Supply Same Code and Diagram For Running Multiple LCD Displays On One Arduino UNO. Basic matter is that, when we use LCD without I²C module then it occupies lot of pins. For making easy around basic theory, we discussed about Serial Peripheral Interface, I²C etc topics and shown example setup of 1602A LCD Display I2C Serial Interface. The solution to run multiple LCDs at the same time probably obvious by now – using I²C module. But without I²C module it is also possible to use multiple LCD displays, that is by sharing some of the pins.

 

Code and Connection To Run Multiple LCD Displays On One Arduino UNO

 

Using I²C LCD module it is quite easy. I²C LCD module has only two unique pins per module – SDA and SCL. Code will be like this :

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#include <Wire.h> //Include Wire.h library
#include <LiquidCrystal_I2C.h> //Include LiquidCrystal_I2C.h library
 
LiquidCrystal_I2C lcd1(0x3F, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); // address of lcd1 in our definition is 3x0F
LiquidCrystal_I2C lcd2(0x3D, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); // address of lcd2 in our definition is 3x0D
 
void setup()
{
lcd1.begin(16,2);
lcd1.backlight();
 
lcd2.begin(16,2);
lcd2.backlight();
}
 
void loop()
{
lcd1.setCursor(0,0);
lcd2.setCursor(0,0);
 
lcd1.print("Display 1"); /
lcd2.print("Display 2");
 
delay(1000);
lcd1.setCursor(0,1);
lcd2.setCursor(0,1);
 
lcd1.print("Remember");
lcd2.print("JiMA.in");
}

You will clearly see two different prints on two different displays.

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---

Without I²C module same thing is also possible. First look at “Hello World” example :

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https://www.arduino.cc/en/Tutorial/HelloWorld

From that :

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const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
...

…means :

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const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
...

Let us rearrange the connection pins :

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LiquidCrystal lcd(12, 5, 7, 8, 9, 10);
...

We can have 2 or 3 or 4 LCD sharing some pins with one unique :

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LiquidCrystal lcd1(12, 5, 7, 8, 9, 10);
LiquidCrystal lcd2(12, 4, 7, 8, 9, 10);
LiquidCrystal lcd3(12, 3, 7, 8, 9, 10);
LiquidCrystal lcd4(12, 2, 7, 8, 9, 10);
...

Pin 7, 8, 9 and 10 on the Arduino for the data. Pin 12 for RS. Pin 2, 3, 4 and 5 for the signal for display. You can use one common potentiometer. Idea of using four displays is from this website :

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https://www.hackmeister.dk/2010/08/4-lcd-displays-on-1-arduino/

Working proof that it works :

Running Multiple LCD Displays On One Arduino UNO

Code will go like this :

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#include <LiquidCrystal.h>
LiquidCrystal lcd1(12, 5, 7, 8, 9, 10);
LiquidCrystal lcd2(12, 4, 7, 8, 9, 10);
LiquidCrystal lcd3(12, 3, 7, 8, 9, 10);
LiquidCrystal lcd4(12, 2, 7, 8, 9, 10);
void setup() {
  lcd1.begin(16, 2);
  lcd2.begin(16, 2);
  lcd3.begin(16, 2);
  lcd4.begin(16, 2);
// 1, 2 3, 4 are printed on displays
  lcd1.print("1");
  lcd2.print("2");
  lcd3.print("3");
  lcd4.print("4");
}
void loop() {
  lcd1.setCursor(0, 1);
  lcd2.setCursor(0, 1);
  lcd3.setCursor(0, 1);
  lcd4.setCursor(0, 1);
  lcd1.print(millis()/1);
  lcd2.print(millis()/10);
  lcd3.print(millis()/100);
  lcd4.print(millis()/1000);
}

Tagged With корпус для дисплея ардуино , проекты на ардуино своими руками , balanceyj9 , arduino проекты , arduino uno two display , arduino uno multiple lcd displays , arduino sahası dijital görünüm , arduino program hacking , arduino plc project , Arduino multiple screens

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Abhishek Ghosh

About Abhishek Ghosh

Abhishek Ghosh is a Businessman, Surgeon, Author and Blogger. You can keep touch with him on Twitter - @AbhishekCTRL.

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About This Article

Cite this article as: Abhishek Ghosh, "Running Multiple LCD Displays On One Arduino UNO," in The Customize Windows, August 23, 2018, January 31, 2023, https://thecustomizewindows.com/2018/08/running-multiple-lcd-displays-on-one-arduino-uno/.

Source:The Customize Windows, JiMA.in

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