Example Code for Arduino-Backlight Fade

Hardware Preparation

• DFRduino UNO R3 with IO Expansion Shield and USB Cable A-B
• Gravity: I2C LCD1602 Arduino LCD Display Module (Gray)
• Sensor cable x1

Software Preparation

• Development Tool: Arduino IDE; Download Link: Click to Download Arduino IDE from Arduino?
• DFRobot LCD Library:Click to Download DFRobot LCD Library(Github)
• Library installation guide: How to install Libraries in Arduino IDE

Wiring Diagram

Sample Code

/*!
  * file Fade.ino
  * brief Fade.
  *
  * Copyright  [DFRobot](https://www.dfrobot.com), 2016
  * Copyright GNU Lesser General Public License
  *
  * version  V1.0
  * date  2018-1-13
  */

#include "DFRobot_RGBLCD1602.h"

/*
Change the RGBaddr value based on the hardware version
-----------------------------------------
       Moudule        | Version| RGBAddr|
-----------------------------------------
  LCD1602 Module      |  V1.0  | 0x60   |
-----------------------------------------
  LCD1602 Module      |  V1.1  | 0x6B   |
-----------------------------------------
  LCD1602 RGB Module  |  V1.0  | 0x60   |
-----------------------------------------
*/

DFRobot_RGBLCD1602 lcd(/*RGBAddr*/0x6B ,/*lcdCols*/16,/*lcdRows*/2);  //16 characters and 2 lines of show

void breath(unsigned char color){
    for(int i=0; i<255; i++){
        lcd.setPWM(color, i);  // set backlight, set i as 0 means close the backlight
        delay(5);
    }

    delay(500);
    for(int i=254; i>=0; i--){
        lcd.setPWM(color, i);
        delay(5);
    }

    delay(500);
}

void setup() {
    // initialize
    lcd.init();
    // Print a message to the LCD.
    lcd.setCursor(4, 0);
    lcd.print("DFRobot");
    lcd.setCursor(1, 1);
    lcd.print("lcd1602 module");
}

void loop() {

     breath(lcd.REG_ONLY);
}

Result

• In the first row, the fifth pane of the screen shows "DFRobot"
• The second row, the second pane of screen shows "lcd1602 module"
• The screen backlight shows the breathing state while the caption is displayed