Hi
This program displays two bars 8 pixels high, how to change the high to 1 pixel ?
/*
* Simple 2-channel VU-meter with peak detect - by mira308sw - 2013
* a crazy sketch for 16x2 lcd display
*/
#include <LiquidCrystal.h>
/* Modify the pin number below to meet your board
*/
#define IN_LEFT 4 // analog input for left channel
#define IN_RIGHT 5 // analog input for right channel
LiquidCrystal lcd( 8, // RS
9, // E
4, // DB4
5, // DB5
6, // DB6
7 // DB7
);
/* Other minor configurable value
*/
#define T_REFRESH 100 // msec bar refresh rate
#define T_PEAKHOLD 3*T_REFRESH // msec peak hold time before return
/* local variable
*/
byte fill[6]={ 0x20,0x00,0x01,0x02,0x03,0xFF }; // character used to fill (0=empty 5=full)
byte peak[7]={ 0x20,0x00,0x04,0x05,0x06,0x07,0x20 }; // character used to peak indicator
int lmax[2]; // level max memory
int dly[2]; // delay & speed for peak return
void bar ( int row,int lev )
{
lcd.setCursor( 0,row );
lcd.write( row ? 'R' : 'L' );
for( int i=1 ; i<16 ; i++ )
{
int f=constrain( lev -i*5,0,5 );
int p=constrain( lmax[row]-i*5,0,6 );
if( f )
lcd.write( fill[ f ] );
else
lcd.write( peak[ p ] );
}
if( lev>lmax[row] )
{
lmax[row] = lev;
dly[row] = -(T_PEAKHOLD)/T_REFRESH; // Starting delay value. Negative=peak don't move
}
else
{
if( dly[row]>0 )
lmax[row] -= dly[row];
if( lmax[row]<0 )
lmax[row]=0;
else
dly[row]++;
}
}
byte block[8][8]=
{
{ 0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10 }, // define character for fill the bar
{ 0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18 },
{ 0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C },
{ 0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E },
{ 0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08 }, // define character for peak level
{ 0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04 },
{ 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02 },
{ 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01 },
};
void setup ( void )
{
lcd.begin( 16,2 );
for( int i=0 ; i<8 ; i++ )
lcd.createChar( i,block[i] );
}
long lastT=0;
void loop ( void )
{
if( millis()<lastT )
return;
lastT += T_REFRESH;
int anL = map( sqrt( analogRead( IN_LEFT )*16 ),0,128,0,80 ); // sqrt to have non linear scale (better was log)
int anR = map( sqrt( analogRead( IN_RIGHT )*16 ),0,128,0,80 );
bar( 0,anL );
bar( 1,anR );
}
