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|800}}

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.

UPDATED : OCT 26 2010 (please play around with it)

//import LED screen library (this is not necessary unless you have a screen)
#include <LiquidCrystal.h>

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

int pos1=0;
int pos2=0;

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

//pins for the LED 
LiquidCrystal lcd(6, 7, 2, 3, 4, 5);

//shifting patterns, only 1 necessary unless you're doing the shift
String pat = "999999999999";
String mov = "555755757557";

//button vars
const int buttonPin = 9;
int buttonState = 0;

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

void loop() {   
  
  //read if the button is pressed
  buttonState = digitalRead(buttonPin);
  
    if (buttonState == HIGH) {   
      //if so, get the length of the pattern
      int patlen = pat.length();
      
      //loop for every part of the pattern...
      for (int p=0; p<patlen; p++) {
        
        //tone stuff
        //compute the difference of the 2 values (if you're shifting)
        int val1 = pat.charAt(p);
        int val2 = mov.charAt(p);
        int diff = (val1-val2)*100;
          
        //play the tone
        tone(8, diff, 10);
          
        //starting shifting (if you are doing it)
        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 you're at the end of the screen start again
        if(a<8){row=0;}else{row=1;}
        if(lpos==8){lpos=0;}
        
        //set the cursor
        lcd.setCursor(lpos,row);
        
        String newstr = diff;
        if(a==16){a=0;lcd.clear();}
        lcd.print(newstr.charAt(0), BYTE);
        
        lpos++;
        a++;
        
        //and wait
        delay(150);
      }
    
    }else{
      //if button is not pressed, just scroll the text
      txt="NOT PLAYING";
      readtext();
    }
  
  

}

void readtext(){
  //to read an arbitrary text on the screen
  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(); 
}