What I have done in this library is to implement communication protocol ( ) with my specific serial LCD ( ). You use only the transmit line of HardwareSerial ( ) or SoftwareSerial ( ) to communicate with your serial LCD.įigure 2: A serial LCD (connected with SoftwareSerial) Information flow is one-way, from Arduino to serial LCD, therefore it needs only one digital pin of your Arduino. To do this, it provides you a serial interface with an only one line. You command this microcontroller, and it commands LCD (Hitachi controller). When it comes to serial LCD, those low-level driving issues are diverted to another microcontroller. Now, it is time to talk about serial LCD.
#4 BIT ARDUINO LCD LIBRARY HOW TO#
I hope this sample is enough to see how to use an LCD with LiquidCrystal library. Dedicated pins are specified in the constructor.Ĭopy Code lcd.setCursor( 1, 1) // second column of second row LiquidCrystal library exposes those functions by commanding Hitachi controller.
Setting cursor type (hide, underline, blink).Some functionality provided by Hitachi-based controller: In 4-bit usage, you need 6 digital pin of your Arduino out of 14. You command the controller by selecting & writing registers according to your needs. As a solution, serial LCD displays has emerged, thanks to kindhearted manufacturers :) BackgroundĪrduino IDE comes with a LiquidCrystal library ( ) for Hitachi-HD44780-based LCDs ( ). One drawback is that it occupies to many pins on your Arduino board. Therefore, you can find many kinds of LCD display on the market. They are cheap, widely-available, easy-to-use. LCD displays are mostly used in Arduino-based systems to show output of your application.
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