Steven Swenson
A program to automatically tune a guitar. Written by Justin Reidhead and Steven Swenson
Dependencies: FFT FrequencyFinder Motor NewTextLCD PinDetect mbed strings
Revision 15:bb2bc286f44b, committed 2014-08-13
- Comitter:
- melangeaddict
- Date:
- Wed Aug 13 00:37:33 2014 +0000
- Parent:
- 14:fd59e7acf2e5
- Commit message:
- Final version of Guitar Tuner by Justin Reidhead and Steven Swenson
Changed in this revision
--- a/FFT.lib Thu Apr 26 22:20:53 2012 +0000 +++ b/FFT.lib Wed Aug 13 00:37:33 2014 +0000 @@ -1,1 +1,1 @@ -http://mbed.org/users/Suky/libraries/FFT/lmedn0 \ No newline at end of file +http://mbed.org/users/Suky/code/FFT/#e3af07c00c13
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/FrequencyFinder.lib Wed Aug 13 00:37:33 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/melangeaddict/code/FrequencyFinder/#78c2ee8ea962
--- a/FrequencyFinder/.lib Thu Apr 26 22:20:53 2012 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,1 +0,0 @@ - \ No newline at end of file
--- a/FrequencyFinder/FrequencyFinder.cpp Thu Apr 26 22:20:53 2012 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,107 +0,0 @@
-#include "FrequencyFinder.h"
-
-using namespace std;
-
-FrequencyFinder::FrequencyFinder(PinName input) : _signal_in(input), _dc_offset(p18) {
- index=0;
- peak=0;
- frequency_final=0;
-}
-
-FrequencyFinder::~FrequencyFinder() {
- ticker.detach();
-}
-
-float FrequencyFinder::find_frequency() {
- initialize_array();
- ticker.attach_us(this, &FrequencyFinder::get_data,500);
-
- wait(1);
- ticker.detach();
-
- copy_data();
-
- vRealFFT(signal_array,size);
-
- take_abs();
-
- int peak = find_peak();
-
- float frequency_final=((float)peak)/4.1;
-
- return frequency_final;
-}
-
-void FrequencyFinder::get_data() {
- if (index<size) {
- signal_array[index]=_signal_in.read();//-0.5;
- index++;
- }
-}
-
-void FrequencyFinder::take_abs() {
-//takes the absolute value of the signal
- for (int j=0; j<size; j++) {
- signal_array[j]=abs(signal_array[j]);
- if (j<200)//~48Hz
- signal_array[j]=0;
- else if (j<400)//~97Hz
- signal_array[j]=signal_array[j]*3;
- else if (j<550)//~
- signal_array[j]=signal_array[j]*6;
- else if (j<900)//~219Hz
- signal_array[j]=signal_array[j]*10;
- else if (j<1200)//292Hz
- signal_array[j]=signal_array[j]*12;
- else
- signal_array[j]=signal_array[j]*30;
- }
-}
-
-int FrequencyFinder::find_peak() {
- int i=0;
-
- for (int j=0; j<size; j++) {
- if ((signal_array[i]-signal_array[i-1])>100 ) {
- while (
- (signal_array[i]<=signal_array[i+1]) &&
- (signal_array[i]<=signal_array[i+2]) &&
- (signal_array[i]<=signal_array[i+3]) &&
- (signal_array[i]<=signal_array[i+4])) {
- i++;
- }
- return FrequencyFinder::find_max(i);
- }
- i++;
- }
- return FrequencyFinder::find_max(i);
-}
-
-int FrequencyFinder::find_max(int position) {
- int index1=position-20;
- int index2=position+20;
- float max=signal_array[index1];
- int max_index=0;
-
- for (int a=index1; a<index2; a++) {
- if (signal_array[a]>max) {
- max=signal_array[a];
- max_index=a;
- }
- }
-
- return max_index;
-}
-
-void FrequencyFinder::initialize_array() {
- index=0;
- for (int w=0; w<size; w++) {
- signal_array[w]=0;
- }
-}
-
-void FrequencyFinder::copy_data() {
- for (int i=0; i<size/2; i++) {
- signal_array[i+(size/2)]=signal_array[i];
- }
-}
\ No newline at end of file
--- a/FrequencyFinder/FrequencyFinder.h Thu Apr 26 22:20:53 2012 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,35 +0,0 @@
-#pragma once
-#include "mbed.h"
-#include "FFT.h"
-
-#include "NewTextLCD.h"
-
-using namespace std;
-
-const int size=4096;
-
-class FrequencyFinder{
-public:
-
-FrequencyFinder(PinName input);
-~FrequencyFinder();
-
-float find_frequency();
-void get_data();
-void take_abs();
-int find_peak();
-int find_max(int);
-void initialize_array();
-void copy_data();
-
-private:
- float signal_array[size];
- int index;
- int peak;
- int frequency_final;
-
- Ticker ticker;
- AnalogIn _signal_in;
- AnalogOut _dc_offset;
-
-};
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Motor.lib Wed Aug 13 00:37:33 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/melangeaddict/code/Motor/#278f07b2be46
--- a/Motor/.lib Thu Apr 26 22:20:53 2012 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,1 +0,0 @@ - \ No newline at end of file
--- a/Motor/Motor.cpp Thu Apr 26 22:20:53 2012 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,19 +0,0 @@
-#include "Motor.h"
-
-Motor::Motor(PinName enable,PinName direction,PinName step) : _enable(enable), _direction(direction), _step(step) {
-_enable=1;
-}
-
-Motor::~Motor() {
-}
-
-void Motor::motor_turn(int direction, int steps) {
- _enable=0;
- float freq=600;//frequency of PWM signal to drive stepper motor
- _step.period(1/freq);
- _step.write(.5);
- _direction=direction;
- wait(steps*(1/freq));
- _step.write(0);
- _enable=1;
-}
\ No newline at end of file
--- a/Motor/Motor.h Thu Apr 26 22:20:53 2012 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,20 +0,0 @@
-#pragma once
-#include "mbed.h"
-#include "string.h"
-
-using namespace std;
-
-class Motor {
-
-public:
-
- Motor(PinName enable,PinName direction,PinName step);
- ~Motor();
-
- void motor_turn(int, int);
-
-private:
- DigitalOut _enable;
- DigitalOut _direction;
- PwmOut _step;
-};
\ No newline at end of file
--- a/NewTextLCD.lib Thu Apr 26 22:20:53 2012 +0000 +++ b/NewTextLCD.lib Wed Aug 13 00:37:33 2014 +0000 @@ -1,1 +1,1 @@ -http://mbed.org/users/erik_kedo/libraries/NewTextLCD/lornxk \ No newline at end of file +http://mbed.org/users/erik_kedo/code/NewTextLCD/#fb402d95983d
--- a/PinDetect.lib Thu Apr 26 22:20:53 2012 +0000 +++ b/PinDetect.lib Wed Aug 13 00:37:33 2014 +0000 @@ -1,1 +1,1 @@ -http://mbed.org/users/AjK/libraries/PinDetect/lkyxpw \ No newline at end of file +http://mbed.org/users/AjK/code/PinDetect/#cb3afc45028b
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Wed Aug 13 00:37:33 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/737756e0b479 \ No newline at end of file
--- a/mbed.lib Thu Apr 26 22:20:53 2012 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,1 +0,0 @@ -http://mbed.org/projects/libraries/svn/mbed/trunk@43 \ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/strings.lib Wed Aug 13 00:37:33 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/melangeaddict/code/strings/#ed8fce1752f7
--- a/strings/.lib Thu Apr 26 22:20:53 2012 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,1 +0,0 @@ - \ No newline at end of file
--- a/strings/strings.cpp Thu Apr 26 22:20:53 2012 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,165 +0,0 @@
-#include "strings.h"
-
-strings::strings() {
-
-}
-
-strings::strings(int string_num) {
- set_values(string_num);
-}
-
-strings::~strings(void) {
-
-}
-
-void strings::set_values(int string_num) {
- index=4;
- switch (string_num) {
- case 6:
- frequencies[0]=65.4;
- frequencies[1]=69.3;
- frequencies[2]=73.4;
- frequencies[3]=77.7;
- frequencies[4]=82.4;
- frequencies[5]=87.3;
- frequencies[6]=92.5;
- frequencies[7]=98;
- frequencies[8]=103.8;
- notes[0]="C";
- notes[1]="C#";
- notes[2]="D";
- notes[3]="D#";
- notes[4]="E";
- notes[5]="F";
- notes[6]="F#";
- notes[7]="G";
- notes[8]="G#";
- break;
-
- case 5:
- frequencies[0]=87.3;
- frequencies[1]=92.5;
- frequencies[2]=98;
- frequencies[3]=103.8;
- frequencies[4]=110;
- frequencies[5]=116.5;
- frequencies[6]=123.4;
- frequencies[7]=130.8;
- frequencies[8]=138.6;
- notes[0]="F";
- notes[1]="F#";
- notes[2]="G";
- notes[3]="G#";
- notes[4]="A";
- notes[5]="A#";
- notes[6]="B";
- notes[7]="C";
- notes[8]="C#";
- break;
-
- case 4:
- frequencies[0]=116.5;
- frequencies[1]=123.4;
- frequencies[2]=130.8;
- frequencies[3]=138.6;
- frequencies[4]=146.8;
- frequencies[5]=155.56;
- frequencies[6]=164.8;
- frequencies[7]=174.6;
- frequencies[8]=184.9;
- notes[0]="A#";
- notes[1]="B";
- notes[2]="C";
- notes[3]="C#";
- notes[4]="D";
- notes[5]="D#";
- notes[6]="E";
- notes[7]="F";
- notes[8]="F#";
- break;
-
- case 3:
- frequencies[0]=155.6;
- frequencies[1]=164.8;
- frequencies[2]=174.6;
- frequencies[3]=184.9;
- frequencies[4]=195.9;
- frequencies[5]=207.6;
- frequencies[6]=220;
- frequencies[7]=233.1;
- frequencies[8]=246.9;
- notes[0]="D#";
- notes[1]="E";
- notes[2]="F";
- notes[3]="F#";
- notes[4]="G";
- notes[5]="G#";
- notes[6]="A";
- notes[7]="A#";
- notes[8]="B";
- break;
-
- case 2:
- frequencies[0]=195.9;
- frequencies[1]=207.6;
- frequencies[2]=220;
- frequencies[3]=233.1;
- frequencies[4]=246.9;
- frequencies[5]=261.6;
- frequencies[6]=277.1;
- frequencies[7]=293.6;
- frequencies[8]=311.1;
- notes[0]="G";
- notes[1]="G#";
- notes[2]="A";
- notes[3]="A#";
- notes[4]="B";
- notes[5]="C";
- notes[6]="C#";
- notes[7]="D";
- notes[8]="D#";
- break;
-
- case 1:
- frequencies[0]=261.6;
- frequencies[1]=277.1;
- frequencies[2]=293.6;
- frequencies[3]=311.1;
- frequencies[4]=329.6;
- frequencies[5]=349.2;
- frequencies[6]=369.9;
- frequencies[7]=391.9;
- frequencies[8]=415.3;
- notes[0]="C";
- notes[1]="C#";
- notes[2]="D";
- notes[3]="D#";
- notes[4]="E";
- notes[5]="F";
- notes[6]="F#";
- notes[7]="G";
- notes[8]="G#";
- break;
-
- default:
- break;
- }
-}
-
-void strings::inc_index() {
- index++;
- if (index>=9)
- index=0;
-}
-
-void strings::reset_index(){
- index=4;
-}
-
-char* strings::get_note() {
- return notes[index];
-}
-
-float strings::get_freq() {
- return frequencies[index];
-}
--- a/strings/strings.h Thu Apr 26 22:20:53 2012 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,24 +0,0 @@
-#pragma once
-#include "string"
-
-class strings
-{
-public:
- strings(int string_num);
- strings();
- ~strings(void);
-
- void inc_index();
- void reset_index();
- char* get_note();
- float get_freq();
-
- protected:
- void set_values(int string_num);
-
-private:
- float frequencies[9];
- char *notes [9];
- int index;
- float threshold[6];
-};