Example Code for Arduino-Set RGB Color
Follow the pin description to connect the hardware, and download the sample code to UNO, after upload is successful, you can see the LCD display and backlight gradient. The backlit color of the LCD1602 module changes according to the input value. Users can learn how to use the DFRobot_RGBLCD1602 library to control the RGB backlight color of the LCD module via serial port input.
Hardware Preparation
- DFRduino UNO R3 with IO Expansion Shield and USB Cable A-B ×1
- Gravity: I2C 16x2 Arduino LCD with RGB Font Display (Black) x1
- Sensor cable x1
Software Preparation
- Arduino IDE, 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
| UNO R3 | PIN | LCD 1602 | PIN |
|---|---|---|---|
| UNO R3 | VCC | LCD 1602 | VCC(RED) |
| UNO R3 | GND | LCD 1602 | GND(BLACK) |
| UNO R3 | SCL | LCD 1602 | SCL(BLUE) |
| UNO R3 | SDA | LCD 1602 | SDA (GREEN) |
Other Preparation Work
- When uploaded the codes into UNO, open serial monitor, set baud rate to 115200 and select no EOF.
- Note: you have to reset the mainboard for every input. The RGB range is 0-255.
Sample Code
/*!
* @file SetColor.ino
* @brief Serial port input Format：255 255 255,There is no end or newline
* @copyright Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
* @licence The MIT License (MIT)
* @maintainer [yangfeng]([email protected])
* @version V1.0
* @date 2021-09-24
* @url https://github.com/DFRobot/DFRobot_RGBLCD1602
*/
#include "DFRobot_RGBLCD1602.h"
char dtaUart[15];
char dtaLen = 0;
/*
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 |
-----------------------------------------
LCD1602 RGB Module | V2.0 | 0x2D |
-----------------------------------------
*/
DFRobot_RGBLCD1602 lcd(/*RGBAddr*/0x2D ,/*lcdCols*/16,/*lcdRows*/2); //16 characters and 2 lines of show
void setup() {
Serial.begin(115200);
/**
* @brief initialize the LCD and master IIC
*/
lcd.init();
// Print a message to the LCD.
lcd.print("set color");
}
void loop() {
if(dtaLen == 11) {
int r = (dtaUart[0]-'0')*100 + (dtaUart[1] - '0')*10 + (dtaUart[2] - '0'); // get r
int g = (dtaUart[4]-'0')*100 + (dtaUart[5] - '0')*10 + (dtaUart[6] - '0');
int b = (dtaUart[8]-'0')*100 + (dtaUart[9] - '0')*10 + (dtaUart[10] - '0');
dtaLen = 0;
/**
* @brief set RGB
* @param r red range(0-255)
* @param g green range(0-255)
* @param b blue range(0-255)
*/
lcd.setRGB(r, g, b);
Serial.println("get data");
Serial.println(r);
Serial.println(g);
Serial.println(b);
Serial.println();
}
}
void serialEvent() {
while(Serial.available()) {
dtaUart[dtaLen++] = Serial.read();
}
}
Result
Input by a group of 4 numbers. For instance, for 12302540123, the input result will be 123，254，123.
The backlit color of the LCD1602 module changes according to the input value
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