User:Laurier Rochon/prototyping/clapping music with arduino LED screen pushbutton

Clapping music + shifting pattern /w Arduino

Constant pattern + shifting pattern using a single channel piezo and values subtraction. I didn't want to use two piezos/speakers as that would simply duplicate the code into something slightly less interesting. Result of the subtraction of the two patterns is printed to the screen and loops.

Got some help from http://www.ladyada.net/learn/lcd/charlcd.html

HARD

• 16-pin 16x1 LED display
• pushbutton
• piezo
• 3 resistors
• breadboard
• Arduino 168 Diecimila

{{#ev:vimeo|16137046|640}}

SOFT

This code needs more work (i.e. more modular). Some things are hard-coded and no comments are in yet...more to come. I had much trouble converting my string/int to char to send to the LCD screen. Atoi wouldn't do it and the built-in C functions wouldn't do it = ugly IF.

#include <LiquidCrystal.h>

const int numRows = 2;
const int numCols = 16;
int a=0;
int row=0;
int lpos=0;

int pos1=0;
int pos2=0;

String txt="NOT PLAYING";
int lentxt=txt.length();

LiquidCrystal lcd(6, 7, 2, 3, 4, 5);

String pat = "999999999999";
String mov = "555755757557";
const int buttonPin = 9;
int buttonState = 0;

void setup() {
  pinMode(buttonPin, INPUT);  
  lcd.begin(numCols,numRows);
}

void loop() {   
  
  buttonState = digitalRead(buttonPin);
  
    if (buttonState == HIGH) {     
      int patlen = pat.length();

      for (int p=0; p<patlen; p++) {
        
        //tone stuff
        
        int val1 = pat.charAt(p);
        int val2 = mov.charAt(p);
        int diff = (val1-val2)*100;
          
        tone(8, diff, 10);
          
        String first = mov.charAt(0);
        String second = "";
         
        for(int i=1;i<12;i++){
          second.concat(mov.charAt(i));
        }
         
        diff = diff/100;
        
        mov = second+first;
        
        //screen stuff
        
        if(a<8){row=0;}else{row=1;}
        if(lpos==8){lpos=0;}
        
        lcd.setCursor(lpos,row);
        
        String newstr = diff;
        if(a==16){a=0;lcd.clear();}
        lcd.print(newstr.charAt(0), BYTE);
        
        lpos++;
        a++;
        
        delay(150);
      }
    
    }else{
      txt="NOT PLAYING";
      readtext();
    }
  
  

}

void readtext(){
  for (int lindex = 0; lindex <= lentxt; lindex++) {
     
      if(a<8){row=0;}else{row=1;}

      if(lpos==8){lpos=0;}

      lcd.setCursor(lpos,row);
      lcd.print(txt.charAt(lindex), BYTE);
      delay(100); 

      lpos++;
      a++;
      
      if(a==16){ a=0;lcd.clear();}  
   }
   lcd.clear(); 
}