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Displays Equipment - A Liquid Crystal Display commonly abbreviated as LCD is basically a display unit built using Liquid Crystal technology. We need a medium/device to display output values and messages when it comes to building real-life/real-world electronics based projects. 7 Segment display is the most basic form of electronic display available which has its own limitations. Liquid Crystal Displays is the next best available option that comes in different size specifications. Let us know more in detail about Displays Equipment.
The most commonly used one is the 16×2 LCD Module, out of all available LCD modules in the market, that can display 32 ASCII characters in 2 lines (16 characters in 1 line). LCD displays that are used in common are 20×4 Character LCD, Nokia 5110 LCD module, 128×64 Graphical LCD Display, and 2.4 inch TFT Touch screen LCD display.
With 2 examples, we will learn how to interface LCD to Arduino – one being interfacing a 16×2 LCD module to Arduino and the other being interfacing a 20×4 LCD module to Arduino.Let your Arduino project make sign to you! Interface your Arduino project with LCD or TFT screens to add visual feedback. We sell easy to use TFT, LCD and other display related good for Arduino now available in the Philippines.
In many Arduino based embedded system designs, LCD modules form a very important part. In designing embedded systems, the knowledge on interfacing LCD module to Arduino is very essential. This section of the article is about interfacing an Arduino to a 16×2 LCD. JHD162A is the LCD module used here. Based on the HD44780 driver from Hitachi, JHD162A is a 16×2 LCD module. The JHD162A can be operated in 4-bit mode, as it has 16 pins. In 4-bit mode, we are using the LCD module which shows how to display a plain text message on the LCD module using Arduino, and other projects using LCD and Arduino – a digital thermometer.
The JHD162A Lcd module can be operated in 4-bit mode or 8-bit mode as it has 16 pins. You can check out the JHD162A LCD module, before you get into the details of the project.
Pin3(VEE): Contrast adjustment pin. This is done by connecting the ends of a 10K potentiometer to +5V and ground and then connecting the slider pin to the VEE pin. At the VEE pin, the voltage defines the contrast. Between 0.4 and 0.9V, is the normal setting.
Pin4(RS): Register select pin. The JHD162A has two registers namely the command register and data register. Logic LOW at RS pin selects command register and logic HIGH at RS pin selects data register. To display on the LCD screen, if you make the RS pin HIGH and feed input to the data lines (DB0 to DB7).
Pin5(R/W): Read/Write modes. This pin is used for selecting between reading and write modes. Logic LOW at this pin activates write mode and logic HIGH at this pin activates read mode.
To facilitate communication between Arduino and LCD module, we make use of a built in library in Arduino <LiquidCrystal.h> – which is written for LCD modules making use of the Hitachi HD44780 chipset (or a compatible chipset). This library can handle both 4-bit mode and 8-bit mode wiring of LCD.