File content as of revision 0:13f61a33458d:

#include "mbed.h"
#include "TextLCD.h"


//TextLCD lcd( p11, p12, p30, p29, p28, p27, TextLCD::LCD20x4 ); // rs, e, d0-d3
//TextLCD lcd(p24, p25, p26, p27, p28, p29, p30); // rs, rw, e, d4, d5, d6, d7
TextLCD lcd(p24, p26, p27, p28, p29, p30); // rs, rw, e, d4, d5, d6, d7
Serial pc( USBTX, USBRX );
//DigitalOut LEDOUT0( LED1 );
//DigitalOut LEDOUT1( LED2 );
//DigitalOut LEDOUT2( LED3 );
//DigitalOut LEDOUT3( LED4 );
PwmOut led1 (LED1);
PwmOut led2 (LED2);
PwmOut led3 (LED3);
PwmOut led4 (LED4);
AnalogIn A0( p20 );

float i;
float l;
int j;
int cnt = 0;

int main() {
    led1 =  led2 =  led3 = led4 = 0;
    pc.printf("\x1B\x48\x1B\x4A");
    pc.printf("Voltmeter\n\r");
    lcd.printf("Voltmeter");
    lcd.locate(0,2);
    lcd.printf("0-----1-----2-----3-");
    while(1) {
        i = A0;
        l = i * 4;
        cnt = cnt < 8 ? ++cnt : 0;
        if (cnt == 0 )
        {
            i *= 3.3; // 1.0 -> 3.3V
            lcd.locate(0,1);
            lcd.printf( "%1.3f   " , i );
            for ( int j = 0; j < 20 ; j++ )
            {
                lcd.locate(j,3);
                if ( ( (float) j ) / 20 * 3.3 < i ) { lcd.printf( "\xFF" ); } else { lcd.printf( "_" ); }
            }
            pc.printf("\x1B\x48");
            pc.printf( "\n\n\rMeasured : %1.3f" , i );        
        }
        if ( l < 1 ) { led1 = l; l = 0; } else { led1 = 1; l = l - 1; }
        if ( l < 1 ) { led2 = l; l = 0; } else { led2 = 1; l = l - 1; }
        if ( l < 1 ) { led3 = l; l = 0; } else { led3 = 1; l = l - 1; }
        if ( l < 1 ) { led4 = l; l = 0; } else { led4 = 1; l = l - 1; }
        wait(0.05);
    }
}