From the mbed microcontroller Cookbook.

LCD serial with shift register

One possibility to control a display saving pin ;)

/media/uploads/Suky/lcdserial.png

Example

Code

#include "mbed.h"
#include "LCD_Serial.h"

DigitalOut myled(LED1);
LCDSerial myLcd(p13,p14,p15,p16); // Data, Clock, Enable, Back

int main() {
    char k=0;
    
    myLcd.printf("\fHello mbed! Library\nLCD serial with\nshift register\nby Suky...");
    myLcd.vSetBacklight(1);
    while(1) {
        myLcd.vGotoxy(20,4);
        myLcd.vPutc(k);
        if(++k==8){k=0;}
        myled = 1;
        wait(0.2);
        myled = 0;
        wait(0.2);
    }
}

» Import this program SerialLCD_example

LCD Serial with shift register

/media/uploads/Suky/imagen0059.jpg

Library

» Import this library into a program SerialLCD

LCD Serial with shift register

Page history

Last modified 05 Feb 2011, by Ale C.-

No tags | 6 comments

6 comments on LCD serial with shift register:

Vatsal Shah

# 06 Feb 2011

Nice work..btw you have given 5V supply to shift register..won't it create problem with MBED ?

Ale C.-

# 06 Feb 2011

Vatsal Shah wrote:

Nice work..btw you have given 5V supply to shift register..won't it create problem with MBED ?

The display requires 5V to operate. In addition, a logical 1 must be greater than 4.5V, so the register must be fed with 5V. And there has been no problem with the mbed. USB can deliver up to 500mA depending on how you set the descriptor

Vatsal Shah

# 15 Feb 2011

It works perfectly...thanks a lot..i am making LCD backpack PCB for the same..will share it..

Sri Buntoro

# 17 Feb 2011

Great job ! I try the lib, and it works at once. Works with my old stock of 5Volt 2X16 LCD.

Sri Buntoro

# 17 Feb 2011

Btw, I think you could move ENABLE and BACK to shift register and drive it serially, saving two port more at MBED......

Vatsal Shah

# 14 Mar 2011

hi, i wanted to know how to modify clk for transmission. i am directly sending 9600 baud serial data to lcd..it is missing every alternate character.

Thank you, Vatsal

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LCD serial with shift register

Code

» Import this programSerialLCD_example

» Import this library into a programSerialLCD

6 comments on LCD serial with shift register:

Vatsal Shah wrote:

» Import this program SerialLCD_example

» Import this library into a program SerialLCD