![]() ![]() 560 ohm resistor R1 limits the current through the back light LED. The 10K potentiometer is used for adjusting the contrast of the display. Digital lines DB4, DB5, DB6 and DB7 are interfaced to digital pins 5, 4, 3 and 2 of the Arduino. This method is very simple, requires less connections and you can almost utilize the full potential of the LCD module. This means only four of the digital input lines( DB4 to DB7) of the LCD are used. In this project, the LCD module and arduino are interfaced in the 4-bit mode. Enable pin of the LCD module is connected to digital pin 11 of the arduino. RS pin of the LCD module is connected to digital pin 12 of the arduino. Circuit diagram – Arduino to 16×2 LCD Module The circuit diagram of interfacing LCD to arduino for displaying a text message is shown below. Pin16(LED-): Cathode of the back light LED.įor knowing more about LCD module JHD162A and its pin functions, read this article: Interfacing 16×2 LCD and 8051 microcontroller. In arduino based projects the back light LED can be powered from the 3.3V source on the arduino board. When operated on 5V, a 560 ohm resistor should be connected in series to this pin. Pin15(LED+): Anode of the back light LED. The commands and data are fed to the LCD module though these pins. Pin7(DB0) to Pin14(DB7): These are data pins. A HIGH to LOW signal at this pin will enable the module. ![]() Pin6(E): This pin is meant for enabling the LCD module. Logic HIGH at this pin activates read mode and logic LOW at this pin activates write mode. This pin is used for selecting between read and write modes. ![]() If we make the RS pin LOW and feed an input to the data lines, then this will be treated as a command ( a command to be written to LCD controller – like positioning cursor or clear screen or scroll). If we make the RS pin HIGH and feed an input to the data lines (DB0 to DB7), this input will be treated as data to display on LCD screen. ![]() Logic HIGH at RS pin selects data register and logic LOW at RS pin selects command register. Pin4(RS):Register select pin.The JHD162A has two registers namely command register and data register. The normal setting is between 0.4 and 0.9V. The voltage at the VEE pin defines the contrast. 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. Pin2(Vcc): Power to LCD module (+5V supply is given to this pin) The name and functions of each pin of the 16×2 LCD module is given below. Before going in to the details of the project, let’s have a look at the JHD162A LCD module.The schematic of a JHD162A LCD pin diagram is given below. Here we are using the LCD module in 4-bit mode. The JHD162A lcd module has 16 pins and can be operated in 4-bit mode or 8-bit mode. Before going in to the details of the project, let’s have a look at the JHD162A LCD module. First, I will show you how to display a plain text messages on the LCD module using arduino and then I have designed a useful project using LCD and arduino – a digital thermometer. The JHD162A has 16 pins and can be operated in 4-bit mode (using only 4 data lines) or 8-bit mode (using all 8 data lines). JHD162A is a 16×2 LCD module based on the HD44780 driver from Hitachi. This section of the article is about interfacing an Arduino to 16×2 LCD. So the knowledge on interfacing LCD module to arduino is very essential in designing embedded systems. LCD modules form a very important part in many arduino based embedded system designs. In this article, we are going to learn how to interface lcd to arduino with 2 examples – one being interfacing a 16×2 LCD module to Arduino and the other being interfacing a 20×4 LCD module to Arduino. Other commonly used LCD displays are 20×4 Character LCD, Nokia 5110 LCD module, 128×64 Graphical LCD Display and 2.4 inch TFT Touch screen LCD display. Out of all available LCD modules in market, the most commonly used one is 16×2 LCD Module which can display 32 ASCII characters in 2 lines (16 characters in 1 line). The next best available option is Liquid Crystal Displays which comes in different size specifications. The most basic form of electronic display available is 7 Segment display – which has its own limitations. When we build real life/real world electronics based projects, we need a medium/device to display output values and messages. Let’s begin.Ī Liquid Crystal Display commonly abbreviated as LCD is basically a display unit built using Liquid Crystal technology. We’re interfacing 16×2 LCD to Arduino as a demonstration with circuit and code. In this guide, we’re learning how to interface LCD to Arduino and display text characters on LCD screen. ![]()
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