File content as of revision 0:90918a0a0969:

#define mC 2610.626
#define mD 2930.665
#define mE 3290.628
#define mF 3490.228
#define mG 3910.995
#define mA 440.000
#define mB 493.883
// viollin: 391.995~4186.009
// viola: 261.626~2093.005
// cello: 130.813~1046.502
// contrabass: 82.407~391.995
// hape: 61.735~6271.927
 
#include "mbed.h"
#include "math.h"
 
Ticker timer;
AnalogOut sp1(p18);
AnalogIn magSensors[] = {p15,p16,p17,p19,p20};
float ms[180];
float m1,m2,m3,m4,m5;
float freq[3] = {0,0,0};
 
void sound_out(void) {
//    
    static float j1=0;
    static float j2=0;
    static float j3=0;
    static float j4=0;
    static float j5=0;
    j1=j1+m1;
    j2=j2+m2;
    j3=j3+m3;
    j4=j4+m4;
    j5=j5+m5;
    if (j1>180)j1=j1-180;
    if (j2>180)j2=j2-180;
    if (j3>180)j3=j3-180;
    if (j4>180)j4=j4-180;
    if (j5>180)j5=j5-180;
    sp1.write((ms[(int)j1]+ms[(int)j2]+ms[(int)j3]+ms[(int)j4]+ms[(int)j5])/5.0);
}
 
int main() {
    int i;
    //setting sincurv
    for (i=0;i<180;i++) {
        ms[i]=sin(2*3.1415*(float)i/180.0)/2.0+0.5;
    }
    timer.attach_us(&sound_out,100); //10kHz
    while(true){
//        printf("magSensors: %f, %f, %f\n", magSensors[0]*3.3 * 1054 + 20, magSensors[1]*3.3, magSensors[2]*3.3);

//        m1 = (magSensors[0]*3.3 * 1149.7 + 391.995) *2*180/10000; //606 violin
//        m2 = (magSensors[1]*3.3 * 554.96 + 261.626) *2*180/10000; //606  2000 viola
//        m3 = (magSensors[2]*3.3 * 227.48 + 130.813) *2*180/10000; //  cello
//        m4 = (magSensors[3]*3.3 * 93.815 + 82.407) *2*180/10000; //606  2000
//        m5 = (magSensors[4]*3.3 * 1881.876 + 61.735) *2*180/10000; //       
//        
        m1 = (magSensors[0]*3.3 * 1881.876 + 61.735) *2*180/10000; //       
        m2 = (magSensors[1]*3.3 * 1881.876 + 61.735) *2*180/10000; //       
        m3 = (magSensors[2]*3.3 * 1881.876 + 61.735) *2*180/10000; //       
        m4 = (magSensors[3]*3.3 * 1881.876 + 61.735) *2*180/10000; //       
        m5 = (magSensors[4]*3.3 * 1881.876 + 61.735) *2*180/10000; //       
        
       // m1 = (sqrt(magSensors[0]*3.3) * 3418.598 + 61.735) *2*180/10000; //       
//        m2 = (sqrt(magSensors[1]*3.3) * 3418.598 + 61.735) *2*180/10000; //       
//        m3 = (sqrt(magSensors[2]*3.3) * 3418.598 + 61.735) *2*180/10000; //       
//        m4 = (sqrt(magSensors[3]*3.3) * 3418.598 + 61.735) *2*180/10000; //       
//        m5 = (sqrt(magSensors[4]*3.3) * 3418.598 + 61.735) *2*180/10000; //       
//        printf("%f,%f,%f,%f,%f\n",m1,m2,m3,m4,m5);
        
        // Error avoid
        
        //for(int i = 0; i < 3; i++) {
//            m[i] = magSensors[i]*3.3*6054+20;
//       }
        //
        wait(0.00001);
    }
    ////ceg
//    m1=mC*2*180/10000;
//    m2=mE*2*180/10000;
//    m3=mG*2*180/10000;
//    wait(1.0f);
//    //cfa
//    m1=mC*2*180/10000;
//    m2=mF*2*180/10000;
//    m3=mA*2*180/10000;
//    wait(1.0f);
//    //ceg
//    m1=mC*2*180/10000;
//    m2=mE*2*180/10000;
//    m3=mG*2*180/10000;
//    wait(1.0f);
//    //bdg
//    m1=mB*180/10000;
//    m2=mD*2*180/10000;
//    m3=mG*2*180/10000;
//    wait(1.0f);
//    //ceg
//    m1=mC*2*180/10000;
//    m2=mE*2*180/10000;
//    m3=mG*2*180/10000;
//    wait(1.0f);
//    timer.detach();
//    sp1.write(0.0f);
//    while (1);
}

//Ticker timer;
//AnalogOut sp1(p18); //define analog out pin
//
//float ms[180];
//float m1;
//int counter = 0;
//
//void sound_out(void) {
//    static float j = 0;
//    j = j + m1;
//    if(j > 180) j = j - 180;
//    sp1.write(ms[(int)j]);
//    counter++;
//    if(counter > 500000) {
//        timer.detach();
//        }
//}
//
//int main() {
//    float mm[] = {mC,mD,mE,mF,mG,mA,mB};   //sound scale
//    //setting sinecurv
//    for(int i = 0; i < 180; i++) {
//        ms[i] = sin(2*3.1415*(float)i/180.0)/2.0+0.5;
//    }
//    
//    for(int i = 0; i < sizeof(mm); i++) {
//        m1 = mm[i]*180/100000;
//        timer.attach_us(&sound_out,10);
//        counter = 0;
//        wait(0.5f);
//    }
//    
//    sp1.write(0.0f);
//    while(true);
//}
//
//
//DigitalOut sp1(p5);
//Ticker timer;   //Initialize timer interrupt
//
//int oto = 0;
//
//void tick(void)
//{
//    sp1.write(oto); //Digital Out
//    oto=!oto;       //switch flag of digital out
//}
//
//int main()
//{
//    float mm [] = {mC,mD,mE,mF,mG,mA,mB};   //sound scale
//    for(int i = 0; i < sizeof(mm); i++) {
//        timer.attach(&tick,1.0/mm[i]/2.0);
//        wait(0.5f);
//    }
//    timer.detach();
//    while(true);
//}