File content as of revision 0:7166ed837948:

#include "mbed.h"
 
Serial pc(USBTX, USBRX);               //enable serial port which links to USB
AnalogIn Ain(p19);

BusOut Bar1(p14,p13,p12,p11,p10,p9,p8,p7,p6,p5);
 
float ADCdata;
 
float x1=2.2;
float x2=2.8;
float y1=22.0;
float y2=28.0;
float data2;

int BarConvert(char BarValue) { // function 'BarConvert' 
    
    switch (BarValue) {                 //p14,p13,p12,p11,p10,p9,p8,p7,p6,p5 
        case 20 : return 0x0000; 
        case 21 : return 0x0001;       
        case 22 : return 0x0003;
        case 23 : return 0x0007;
        case 24 : return 0x000F; 
        case 25 : return 0x001F; 
        case 26 : return 0x003F;
        case 27 : return 0x007F;
        case 28 : return 0x00FF; 
        case 29 : return 0x01FF; 
        case 30 : return 0x03FF;
        default : return 0x03FF; 
        }
        }

int main() {
  while(1){
  
  
    ADCdata=Ain*3.3;  
   
    
   data2=((y2-y1)/(x2-x1))*(ADCdata-x1)+y1;
    //data2 = ADCdata ;
    pc.printf("%f \n\r",data2);
    wait(0.5);
    
    Bar1=BarConvert(data2);
        wait_ms(100);
    
  }      
}