Specifying the '1's place

setup - lcd 1602 character display hooked arduino. arduino running basic color changing rgb led varying r, g, , b outputs (0-255).

lcd displays "red:       blue:    "
                   green:                "

and supposed show values each (i.e. "red:255   blue:0  green:255"

the problem have initial value 255. counts down, when gets below 100, ones , tens place shifts left, leaving tailing zero. when initial value 0, counts through 255, ones place gets shifted right @ 10 , again @ 100.

i display show values '1's place locked in specific spot , removing leading zeros.

also, in code, have print function within each 255 - 0 transition, make subroutine that's called in each location , many lines of setting cursors , words done once.

thanks can offer!

code: [select]


#define green 6
#define blue 11
#define red 10
#define delaytime 20
#include <liquidcrystal.h>

liquidcrystal lcd(7, 8, 9, 5, 4, 12);

void setup() {

  pinmode(green, output);
  pinmode(blue, output);
  pinmode(red, output);
  digitalwrite(green, high);
  digitalwrite(blue, high);
  digitalwrite(red, high);
  lcd.begin(16,2);
  }

int redval;
int blueval;
int greenval;
 
void loop() {
 
  int redval = 255;
  int blueval = 0;
  int greenval = 0;
 
  for( int = 0 ; < 255 ; += 1 ){
    greenval += 1;
    redval -= 1;
    analogwrite( green, greenval );
    analogwrite( red, redval );
    lcd.setcursor(0,0);
    lcd.print("red:");
    lcd.setcursor(4,0);
    lcd.print(redval);
    lcd.setcursor(8,0);
    lcd.print("blue:");
    lcd.setcursor(12,0);
    lcd.print(blueval);
    lcd.setcursor(0,1);
    lcd.print("green:");
    lcd.setcursor(8,1);
    lcd.print(greenval); 
    delay( delaytime );
    }
   
  lcd.clear();
  redval = 0;
  blueval = 0;
  greenval = 255;
  for( int = 0 ; < 255 ; += 1 ){
    blueval += 1;
    greenval -= 1;
    analogwrite( blue, blueval );
    analogwrite( green, greenval );
    lcd.setcursor(0,0);
    lcd.print("red:");
    lcd.setcursor(4,0);
    lcd.print(redval);
    lcd.setcursor(8,0);
    lcd.print("blue:");
    lcd.setcursor(12,0);
    lcd.print(blueval);
    lcd.setcursor(0,1);
    lcd.print("green:");
    lcd.setcursor(8,1);
    lcd.print(greenval); 
    delay( delaytime );
  }
  lcd.clear();
  redval = 0;
  blueval = 255;
  greenval = 0;
  for( int = 0 ; < 255 ; += 1 ){
    redval += 1;
    blueval -= 1;
    analogwrite( red, redval );
    analogwrite( blue, blueval );
    lcd.setcursor(0,0);
    lcd.print("red:");
    lcd.setcursor(4,0);
    lcd.print(redval);
    lcd.setcursor(8,0);
    lcd.print("blue:");
    lcd.setcursor(12,0);
    lcd.print(blueval);
    lcd.setcursor(0,1);
    lcd.print("green:");
    lcd.setcursor(8,1);
    lcd.print(greenval); 
    delay( delaytime );
  }
 
}


use sprintf field width specifier, or print space after number print

code: [select]

char buffer [5];
sprintf (buffer, "%4d", redval);
lcd.print(buffer);

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