Serial UART 16x2 LCD

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The serial UART 16x2 LCD allows you to control a parallel based LCD over a single-wire serial interface. The serial LCD takes care of all the HD44780 commands allowing seamless integration with any micro that can communicate over a wide range of TTL serial baud rates. The

Communication with Serial 16x2 LCD requires 5V TTL serial at a default baud rate of 9600bps (8-N-1). You can adjust the baud to any standard rate between 2400 and 38400bps. The power, ground and RX pins are all broken out to a 4-pin 2.54mm pitch header.

Serial 16x2 LCD has the ability to dim the backlight to conserve power if needed. There is also a potentiometer on the backpack to adjust the contrast.

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  • Embedded PIC 16F88 utilizes onboard UART for greater communication accuracy
  • Baud rates of 9600
  • Greater processing speed at 10MHz
  • Incoming buffer stores up to 80 characters
  • Backlight transistor can handle up to 1A
  • Pulse width modulation of backlight allows direct control of backlight brightness and current consumption
  • All surface mount design allows a backpack that is half the size of the original
  • Faster boot-up time
  • Boot-up display can be turned on/off via firmware

Application Ideas




Item Min Typical Max Unit
Voltage 4.3 4.6 5.0 V
Current 53 84 128 mA
Dimension 80.0×36.0×22.7 mm
Net Weight 39 g

Pin definition and Rating

Mechanic Dimensions


Hardware Installation

  • Connect the 5V of Serial LCD to 5V on Arduino.
  • Connect GND of Serial LCD to GND of Arduino.
  • Connect RX of Serial LCD to digital 3 of Arduino.

SerLCD hardware 1.jpg

SerLCD hardware 2.jpg


The following is the sample code assuming that the RX of serial LCD is connected to digital 2 of Arduino. The following code has been tested on Arduino IDE 1.0.1.

#include <SoftwareSerial.h>
#define txPin 2
SoftwareSerial LCD = SoftwareSerial(0, txPin);
// since the LCD does not send data back to the Arduino, we should only define the txPin
const int LCDdelay=10;  // conservative, 2 actually works
// wbp: goto with row & column
void lcdPosition(int row, int col) {
  LCD.write(0xFE);   //command flag
  LCD.write((col + row*64 + 128));    //position 
void clearLCD(){
  LCD.write(0xFE);   //command flag
  LCD.write(0x01);   //clear command.
void backlightOn() {  //turns on the backlight
  LCD.write(0x7C);   //command flag for backlight stuff
  LCD.write(157);    //light level.
void backlightOff(){  //turns off the backlight
  LCD.write(0x7C);   //command flag for backlight stuff
  LCD.write(128);     //light level for off.
void serCommand(){   //a general function to call the command flag for issuing all other commands   
void setup()
  pinMode(txPin, OUTPUT);
  backlightOn() ;
  LCD.print("Hello world from LinkSprite!");
void loop()


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If you have questions or other better design ideas, you can go to our forum to discuss or creat a ticket for your issue at linksprite support.


How to buy

See Also

Other related products and resources.


This documentation is licensed under the Creative Commons Attribution-ShareAlike License 3.0 Source code and libraries are licensed under GPL/LGPL, see source code files for details.