Interfacing LCD to Arduino. JHD162A

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Interfacing LCD to arduino

praveen

June - 19 - 2014

3 Comments

Interfacing LCD to Arduino uno.

LCD modules form a very important part in many arduino based embedded system designs. So the knowledge on interfacing LCD to

arduino is very essential in designing embedded systems. This article is about interfacing a 162 LCD to Arduino. JHD162A is the LCD

module used here. JHD162A is a 162 LCD module based on the HD44780 driver from Hitachi. The JHD162A has 16 pins and can be

operated in 4-bit mode or 8-bit mode. Here we are using the LCD module in 4-bit mode. First, I will show you how to display plain text

messages on the LCD module using arduino and then few useful projects using LCD and arduino. Before going in to the details of the

project, lets have a look at the JHD162A LCD module.

JHD162A LCD module 162.

The JHD162A has 16 pins and can be operated in 4-bit mode or 8-bit mode. Here we are using the LCD module in 4-bit mode. Before

going in to the details of the project, lets have a look at the JHD162A LCD module.The schematic of a JHD162A LCD module is given

below.

The name and functions of each pin of the JHD162A LCD module

is given below.

Pin1(Vss):Ground pin of the LCD module.

Pin2(Vcc):+5V supply is given to this pin

Pin3(VEE):Contrast adjustment pin. This is done by connecting the ends of a 10K potentimeter to +5V and ground and then connecting

the slider pin to the VEE pin. The voltage at the VEE pin defines the contrast. The normal setting is between 0.4 and 0.9V.

Pin4(RS):Register select pin.The JHD162A has two registers namely command register and data register. Logic HIGH at RS pin selects

data register and logic LOW at RS pin will select command register. If we make the RS pin HIGH and put a data on the data lines (DB0 to

acing LCD to arduino. JHD162A is the 16x2 LCD module used here... http://www.circuitstoday.com/interfacing-lcd-t

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DB7) it will be recognized as a data. If we make the RS pin LOW and put a data on the data lines, then it will be taken as a command.

Pin5(R/W): Read/Write modes. This pin is used for selecting between read and write modes. Logic HIGH at this pin activates read mode

and logic LOW at this pin activates write mode.

Pin6(E): This pin is meant for enabling the LCD module. A HIGH to LOW signal at this pin will enable the module.

Pin7(DB0) to Pin14(DB7): These are data pins. The commands and data are put on these pins.

Pin15(LED+): Anode of the back light LED. When operated on 5V, a 560 ohm resistor should be connected in series to this pin. In

arduino based projects the back light LED can be powered from the 3.3V source on the arduino board.

Pin16(LED-): Cathode of the back light LED.

For knowing more about LCD module JHD162A and it interfacing, read this article: Interfacing 162 LCD and 8051 microcontroller. The

circuit diagram of interfacing LCD to arduino for displaying a text message is shown below.

Circuit diagram.

RS pin of the LCD module is connected

to digital pin 12 of the arduino. R/W pin of the LCD is grounded. Enable pin of the LCD module is connected to digital pin 11 of the

arduino. In this project, the LCD module and arduino are interfaced in the 4-bit mode. That means only four of the digital input lines(

DB4 to DB7 of the LCD are used). This method is very simple, requires less connections and you can almost utilize the full potential of

the LCD module. Digital lines DB4, DB5, DB6 and DB7 are interfaced to digital pins 5, 4, 3 and 2 of the Arduino. The 10K

potentiometer is used for adjusting the contrast of the display. 560 ohm resistor R1 limits the current through the back light LED. The

arduino can be powered through the external power jack provided on the board. +5V required in some other parts of the circuit can be

tapped from the 5V source on the arduino board. The arduino can be also powered from the PC through the USB port. The full program

for interfacing LCD to arduino is shown below.

Program.

#include

LiquidCrystal lcd(12, 11, 5, 4, 3, 2); // sets the interfacing pins

void setup()

{

lcd.begin(16, 2); // initializes the 16x2 LCD

}

void loop()

{

lcd.setCursor(0,0); //sets the cursor at row 0 column 0

lcd.print("16x2 LCD MODULE"); // prints 16x2 LCD MODULE


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lcd.setCursor(2,1); //sets the cursor at row 1 column 2

lcd.print("HELLO WORLD"); // prints HELLO WORLD

}

About the program.

Library function LiquidCrystal.h is used for displaying the desired characters on the LCD module. It is readily available with the

Arduino user interface and it can be accessed through the Import library in the sketch tab in the main menu bar. The LiquidCrystal.h

provides functions for almost all applications like printing a string, setting the cursor, initializing the LCD, scrolling the display etc.

Program for scrolling the display.

A simple program for scrolling a text on the LCD using arduino is shown here. This is done using the scroll() function. For example the

function lcd.scrollDisplayRight() will scroll the display to right and the functionlcd.scrollDisplayLeft() will scroll the display to left.

A for loop is used for selecting the number of positions to scroll at a time. In the program shown below, it is chosen to be 2 because the

text to be displayed is comparatively long. For shorter texts more number of positions must be scrolled at a time to get a smooth display.

#include

int i=0;

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup()

{

lcd.begin(16, 2); //initializes 16x2 LCD

lcd.print("16x2 LCD MODULE JHD162A & ARDUINO-UNO"); //text to display

}

void loop()

{

for(i=0;i


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The LM35 temperature sensor is

interfaced to the analog input pins of the arduino. Vcc pin (pin 1) of the LM35 is connected to A0 pin of the arduino. Output pin (pin 2) of

the LM35 is connected to A1 pin of the arduino. GND pin (pin 3) of the LM35 is connected to A2 pin of the arduino. The completeprogram of the LCD thermometer using arduino is given below.

Program: LCD thermometer.

#include

int vcc=A0;

int sensor=A1;

int gnd=A2;

float temp;

float tempf;

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup()

{ pinMode(vcc,OUTPUT);

pinMode(sensor,INPUT);

pinMode(gnd,OUTPUT);

digitalWrite(vcc,HIGH); // Vcc for LM35

digitalWrite(gnd,LOW); // Ground for LM35

lcd.begin(16, 2); // initializes the 16x2 LCD

lcd.setCursor(2,0); // sets the cursor at column 2 row 0

lcd.print("TEMPERATURE"); // prints temperature

}

void loop()

{

temp=analogRead(sensor); // reads the sensor output

temp=temp*5; // converts the sensor reading to temperature

temp=temp/10; // adds the decimal point

tempf=(temp*1.8)+32; // converts to Fahrenheit

lcd.setCursor(0,1); // sets cursor at column 0 row 1

lcd.print(temp); // prints temperature in degree Celsius

lcd.print((char)223); // prints degree sign

lcd.print("C"); // prints letter c

lcd.setCursor(8,1); // sets cursor at column 8 row 1

lcd.print(tempf); // prints temperature in degree Fahrenheit

lcd.print((char)223); // prints degree sign

lcd.print("F"); // prints letter F

delay(1000); // 1 second delay

}


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Tags: interfacing LCD to arduino, JHD162A LCD module

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3 Responses to Interfacing LCD to arduino

chirag surtisays:

August 5, 2014 at 10:24 pm


10 18/11/2014 11


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thanks u for the these great circuits & v r impress on ur circuits

Reply

balwindersays:

July 23, 2014 at 3:19 am

Thanks circuits today team to provide us better circuit guidence and project.love u all team.plz alao post information regarding

Rasbery pi board with simple projects.tx again.

Reply

ElektrikBilimsays:July 4, 2014 at 12:15 am

thanks you a lot for these electronics circuits.

Reply

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Interfacing LCD to Arduino. JHD162A