RGB 1602(English)

Description

We made some improvements based on the former LCD1602 module, so that this RGB1602 is now able to switch different backlight colors, and it has five built-in function keys. RGB1602 display module has two rows and sixteen columns which shows 16*2 characters. The backlight can switch between plenty of colors such as red, green, blue, pink and yellow, etc. The module uses a MCP23017 port expander chip in order to expand Raspberry Pi's IO pins and decrease the amount of IO pins the user needs to operate the display module. This module requires only I2C interface and three IO pins to control the display and 5 function keys. It is reliable and easy-to-setup. The screen itself could be unmounted individually. After unmounting, the screen can be used on a bread board for other customized usages.

Technical Details

Overview

Schematic

LCD module scale

RGB1602 pin description

Learn

• If it's the first time for you to use Raspberry Pi, please make sure the I2C interface is enabled. This page will show you how to enable the I2C interface. http://www.52pi.net/forum.php?mod=viewthread&tid=1363&highlight=rtc
• You also need to install wiringPi library. This page will show you how to install wiringPi. http://wiringpi.com/download-and-install/
• If you are done install the wiringPi and enabling I2C interface, type the following code in the console to build a .c file

sudo vim.tiny lcd1602.c

• Copy and paste the following demo code into lcd1602.c

• Under the vim.tiny editor, type ":", then type "wq" and press "enter" to save the lcd1602.c file and exit editor

• Next you need to compile the code using gcc. Type gcc lcd1602.c -lwiringPi /home/pi/wiringPi/devLib/lcd.o -o lcd1602 in the console to compile.

• You should find an executable file named "lcd1602" if the last step was completed. Type the following code sudo modprobe i2c-dev to load the I2C interface

• Lastly, type sudo ./lcd1602 , and the module will be displaying the demo text, as the following photo shows.

• This is a gif showing the different backlight colors

Demo Code

#include <stdio.h>                                                            //include standard input output head file
#include <wiringPi.h>                                                         //include wiringpi
#include <mcp23017.h>                                                         //include mcp23017 control head file
#include <lcd.h>                                                              //include LCD control head file
#include <softPwm.h>                                                          //include PWM control head file
int main()
{
    long value=0;
    int rand_num;
    int value_blue;                                                       //the blue backlight brightness
    int value_red;                                                        //the red backlight brightness
    int value_green;                                                      //the green backlight brightness
    int display,i,count;
    wiringPiSetup();                                                      //init wiringPi
    mcp23017Setup (100, 0x20);                                            //init mcp23017 chip I2C address: 0x20,the first pin number: 100
    printf ("Raspberry Pi - MCP23017 Test\n");                            //print information
    for(i=0;i<16;i++)
    pinMode(100+i,OUTPUT);                                                //set pin 100 - 115 as output
    digitalWrite(101,0);                                                  //set pin 101 low voltage
    display=lcdInit(2,16,4,100,102,103,104,105,106,0,0,0,0);              //lcd init 2*16,4 bit control,use 100,101,102,103,104 pin as control pin
    lcdHome(display);                                                     //reset cursor
    lcdClear(display);                                                    //clear screen
    lcdPosition(display,0,0);                                             //set display location (0,0)
    lcdPuts(display,"Hello World");                                       //print string "Hello World"
    lcdPosition(display,0,1);                                             //set display location(0,1)
    lcdPuts(display,"www.52pi.net");                                      //print string "www.52pi.net"
    pinMode(0, OUTPUT);                                                   //set Raspberry pi pin 0 as output
    pinMode(2, OUTPUT);                                                   //set Raspberry Pi pin 2 as output
    pinMode(3, OUTPUT);                                                   //set Raspberry Pi pin 3 as output
    softPwmCreate (3, 50, 100);                                           //set soft PWM pin 3 PWM scale (0-100) original 50
    softPwmCreate (2, 50, 100);                                           //set soft PWM pin 2 PWM scale (0-100) original 50
    softPwmCreate (0, 50, 100);                                           //set soft PWM pin 0 PWM scale (0-100) original 50
while(1)                                                                      //always display
{

    delay(200);                                                            //delay 200ms
        value_red=(value<100)?value:0;                                         //0-100 red change
    value_green=(value>100&&value<200)?(value-100):0;                      //100-200 green change
    value_blue=(value>200)?(value-200):0;                                  //200-300 blue change
    if(value>300)                                                          //>300 random colour
    {
        value_red=rand()%100;
        value_green=rand()%100;
        value_blue=rand()%100;
    }
    //rand_num=rand();
    softPwmWrite (3,value_red);                                             //soft PWM control red backlight
    softPwmWrite (2,value_green);                                           //soft PWM control green backlight
    softPwmWrite (0,value_blue);                                            //soft PWM control blue backlight

    value++;
    if(value>900)                                                           //if value >900 return
    {
        value=0;
    }

    lcdPosition(display,13,1);
    lcdPrintf(display,"%d",value);                                           //print number value
    //value_blue=0;

    }
}

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Attachment

LCD manuals demo code