Example Code for Arduino-3-Wire Mode String Display

Hardware Preparation

• 3-wire Serial LCD Module (Arduino Compatible) (Model: DFR0091), Quantity: 1
• Arduino Board, Quantity: 1

Mode Selection

The LCD is shipped in Parallel mode by default. The PSB_ON switch is used to set the interface mode. To switch to 3-Wire mode, Set the switch to SPI.

Wiring Diagram

Connection in 3-Wire mode: (2 Methods)

Method1:

Method2:

Sample Code

The following sample is working under 3-Wire mode. You will need the Arduino Library which can be downloaded here.

/*
1. SPI Interface Inatruction
      clockPin --> SCK(EN)
      latchPin --> CS(RS)
      dataPin --> SID(RW)
 2. Connection:
    1)Turn the BL_ON Switch to the "ON" side;
    2)Turn the PBS_ON Switch to the "SPI" side

Method1:
      LCD                   Arduino
      EN                 Digital Pin 2
      RS                 Digital Pin 7
      RW                 Digital Pin 10
      VCC                     5V
      GND                     GND;

Method2:
      LCD                          Arduino
      SCK       clockPin(defined in the "initDriverPin" function)
      CS        latchPin(defined in the "initDriverPin" function)
      SID       dataPin (defined in the "initDriverPin" function)
      VCC                            5V
      GND                           GND

*/

#include "LCD12864RSPI.h"
#include "DFrobot_bmp.h"
#include "DFrobot_char.h"

#define AR_SIZE( a ) sizeof( a ) / sizeof( a[0] )

unsigned char wangzhi[]=" www.DFRobot.com ";

unsigned char en_char1[]="ST7920 LCD12864 ";

unsigned char en_char2[]="Test, Copyright ";

unsigned char en_char3[]="by DFRobot ---> ";

void setup()
{
  LCDA.initDriverPin(2,7,10);  //INIT SPI Interface
  LCDA.Initialise(); // INIT SCREEN
  delay(100);
  LCDA.DrawFullScreen(logo);//LOGO
  delay(5000);
}

void loop()
{
LCDA.CLEAR();//Clear Screen
delay(100);
LCDA.DisplayString(0,0,en_char1,16);
delay(10);
LCDA.DisplayString(1,0,en_char2,16);
delay(10);
LCDA.DisplayString(2,0,en_char3,16);
delay(10);
LCDA.DisplayString(3,0,wangzhi,16);
delay(5000);
LCDA.CLEAR();//Clear Screen
delay(100);
LCDA.DisplayString(0,0,show1,16);
delay(10);
LCDA.DisplayString(1,0,show2,16);
delay(10);
LCDA.DisplayString(2,0,show3,16);
delay(10);
LCDA.DisplayString(3,0,wangzhi,16);//LOGO
delay(5000);
}