ECE 4180 Final Project

Dependencies:   mbed wave_player 4DGL-uLCD-SE SDFileSystem_OldbutworkswithRTOS PinDetect

Portable Surface Transducer Jukebox

ECE 4180 Final Project

Team members

  • Bruna Correa
  • Lance Hudson
  • Javier Rodriguez

Jukebox Overview

This unique jukebox uses a surface transducer to essentially turn any hard surface (table, etc) into a resonant speaker. The user has the option to select one of out ten songs which were preselected and loaded onto the SD card. To begin, the user types their song choice into the keypad and is prompted to press “START” to begin the song. The user can end the song at any time by pressing “STOP,” which will redirect them back to the original selection menu.

Parts Required

  • 1x Mbed (LPC1768)

Mbed

  • 1x MicroSD card breakout (Sparkfun)

MicroSD Breakout

  • 1x Class D Amp (Sparkfun TPA2005)

Class D Amp

  • 1x Surface conduction transducer speaker (Generic)

Surface Transducer

  • 1x Breadboard speaker

Speaker

  • 2x standard pushbuttons

Pushbutton

  • 1x uLCD (Sparkfun 4DGL)

uLCD Screen

  • 1x Touch capacitance keypad (Sparkfun MPR121)

Touch Pad

  • 2x 6-volt breadboard battery packs

Battery Pack

  • 1x Standard 8x4x4 project box

Project Box

Design Challenges and Tradeoffs

One of the major challenges experienced when developing the Jukebox user interface was the synchronous playback function of the music. This required several instances of interrupt handling and pin detects. More specifically, regarding the “STOP” button, we realized that it was initially not possible to perform any pushbutton polling while the waveplayer function play() is active; if the “STOP” button was pressed while a song is playing, it would only be recognized when the song was finished. Therefore, we looked into editing the waveplayer library itself by passing an extern bool named “play” that was switched to true when “START” is pressed and false when “STOP” is pressed. Inside the play() function we added a logical check to ensure that this play variable is true, and if switched to false, it immediately breaks from the loop, thereby stopping the playback.

Several design tradeoffs had to be made for the benefit of portability. For example, we chose to not implement the original RGB LED strip because it added too much weight and occupied too much space inside the housing for the portable implementation desired. We believe that portability was a more valuable feature for the end user than an LED light show.

Schematic

The schematic used is shown below. For more detailed information on connection declarations and classifications in the software, refer to the code repository.

/media/uploads/jrod1096/schematic.jpeg

Demonstration Video

Files at this revision

API Documentation at this revision

Comitter:
jrod1096
Date:
Wed Dec 12 05:17:58 2018 +0000
Parent:
2:c2afd0c426af
Commit message:
Surface Transducer Jukebox

Changed in this revision

4DGL-uLCD-SE.lib Show annotated file Show diff for this revision Revisions of this file
PinDetect.lib Show annotated file Show diff for this revision Revisions of this file
main.cpp Show annotated file Show diff for this revision Revisions of this file
mbed-rtos.lib Show diff for this revision Revisions of this file
mpr121.cpp Show annotated file Show diff for this revision Revisions of this file
mpr121.h Show annotated file Show diff for this revision Revisions of this file
wave_player.lib Show annotated file Show diff for this revision Revisions of this file
diff -r c2afd0c426af -r 74066405c9fc 4DGL-uLCD-SE.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/4DGL-uLCD-SE.lib	Wed Dec 12 05:17:58 2018 +0000
@@ -0,0 +1,1 @@
+http://os.mbed.com/users/4180_1/code/4DGL-uLCD-SE/#6805edadb9d6
diff -r c2afd0c426af -r 74066405c9fc PinDetect.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PinDetect.lib	Wed Dec 12 05:17:58 2018 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/AjK/code/PinDetect/#cb3afc45028b
diff -r c2afd0c426af -r 74066405c9fc main.cpp
--- a/main.cpp	Tue Apr 18 13:00:09 2017 +0000
+++ b/main.cpp	Wed Dec 12 05:17:58 2018 +0000
@@ -1,23 +1,359 @@
 
 #include "mbed.h"
-#include "rtos.h"
 #include "SDFileSystem.h"
 #include "wave_player.h"
+#include "uLCD_4DGL.h"
+#include "mpr121.h"
+#include "PinDetect.h"
+#include <string>
+#include <list>
 
+DigitalOut led1(LED1);
+InterruptIn interrupt(p26);
+InterruptIn start(p12);
+PinDetect stop(p13);
 
 SDFileSystem sd(p5, p6, p7, p8, "sd"); //SD card
+uLCD_4DGL uLCD(p9, p10, p11);
+Serial pc(USBTX, USBRX);  
+                                                                                                                                                               
 
-AnalogOut DACout(p18);
+// Speaker and Class D
+AnalogOut speaker(p18);
+wave_player waver(&speaker);
+
+// Keypad
+I2C i2c(p28, p27);
+Mpr121 mpr121(&i2c, Mpr121::ADD_VSS);
+
+int keypad = 0;
+string title;
+int title_size;
+string artist;
+int artist_size;
+
+
+bool newKey = false;
+bool play = false;
+bool reset = false;
+
+void key () {
+    
+    newKey = true;
+    
+}
+
+void b1 () {
+    
+    if (keypad != 0) {
+        play = true;
+    }
+    
+}
+
+
+void update_screen(int index) {
+    
+    if (index == 1) { // MENU SCREEN
+    
+            uLCD.cls();
+    
+            // Draw border
+            uLCD.filled_circle(0,0,10,AQUA);   
+            uLCD.filled_circle(0,128,10,AQUA);   
+            uLCD.filled_circle(128,0,10,AQUA);   
+            uLCD.filled_circle(128,128,10,AQUA);   
+            uLCD.filled_rectangle(0,0,128,3,AQUA);   
+            uLCD.filled_rectangle(124,0,128,128,AQUA);  
+            uLCD.filled_rectangle(0,0,3,128,AQUA);  
+            uLCD.filled_rectangle(0,125,128,128,AQUA);  
+
+            // Print title
+            uLCD.color(AQUA);
+            uLCD.text_width(2.5);
+            uLCD.text_height(2.5);
+            uLCD.locate(1,1);
+            uLCD.printf("JUKEBOX");
+ 
+            // Print menu information
+            uLCD.color(TEAL);           
+            uLCD.text_width(1);
+            uLCD.text_height(1);
+            uLCD.locate(3,5);
+            uLCD.printf("  Welcome!\r\n");
+            uLCD.locate(2,6);
+            uLCD.printf("Please make a \r\n");
+            uLCD.locate(2,7);
+            uLCD.printf("song selection.\r\n");            
+            uLCD.locate(1,9);
+            uLCD.printf(" Then hit PLAY!\r\n"); 
+            uLCD.filled_rectangle(15,90,114,90, GREEN);
+            uLCD.filled_rectangle(15,110,114,110, GREEN);            
+            uLCD.filled_rectangle(15,90,15,110, GREEN);
+            uLCD.filled_rectangle(114,90,114,110, GREEN);  
+                       
+    } else if (index == 2) { // SONG CHOICE 
+
+            // Print KEYPAD selection
+            uLCD.text_width(1);
+            uLCD.text_height(1);
+            uLCD.locate(6,12);
+            uLCD.color(GREEN);
+            if (keypad > 0) {
+                if (keypad < 10) {
+                     uLCD.printf("Song 0%i\r\n",keypad);   
+                } else {
+                    uLCD.printf("Song %i\r\n",keypad);
+                }
+            }
+            
+    } else if (index == 3) { // NOW PLAYING
 
-wave_player waver(&DACout);
+            uLCD.cls();
+            
+            // Draw border
+            uLCD.filled_circle(0,0,10,AQUA);   
+            uLCD.filled_circle(0,128,10,AQUA);   
+            uLCD.filled_circle(128,0,10,AQUA);   
+            uLCD.filled_circle(128,128,10,AQUA);   
+            uLCD.filled_rectangle(0,0,128,3,AQUA);   
+            uLCD.filled_rectangle(124,0,128,128,AQUA);  
+            uLCD.filled_rectangle(0,0,3,128,AQUA);  
+            uLCD.filled_rectangle(0,125,128,128,AQUA);             
+   
+            // Print NOW PLAYING     
+            uLCD.color(AQUA);
+            uLCD.locate(1,2);
+            uLCD.text_width(1);
+            uLCD.text_height(1); 
+            uLCD.printf("  Now playing..."); 
+            uLCD.color(GREEN);
+            uLCD.text_width(1);
+            uLCD.text_height(1);
+            uLCD.locate(1,5); 
+            uLCD.printf("%s\r\n",title);    // song title
+            uLCD.locate(1,7); 
+            uLCD.printf("%s\r\n",artist);
+            uLCD.filled_rectangle(15,35,114,35, GREEN);
+            uLCD.filled_rectangle(15,67,114,67, GREEN);            
+            uLCD.filled_rectangle(15,35,15,67, GREEN);
+            uLCD.filled_rectangle(114,35,114,67, GREEN);            
+
 
-int main()
-{
+            // MUSIC SYMBOL #1           
+            uLCD.filled_rectangle(30,76,45,78, BLUE);
+            uLCD.filled_rectangle(30,76,32,91,BLUE);
+            uLCD.filled_rectangle(43,76,45,91,BLUE);
+            uLCD.filled_circle(29,91,3,BLUE);
+            uLCD.filled_circle(42,91,3,BLUE);                
+            
+            
+            // MUSIC SYMBOL #2             
+            uLCD.filled_rectangle(58,84,73,86,PURPLE);
+            uLCD.filled_rectangle(58,84,60,99,PURPLE);
+            uLCD.filled_rectangle(71,84,73,99,PURPLE);
+            uLCD.filled_circle(56,99,3,PURPLE);
+            uLCD.filled_circle(70,99,3,PURPLE);        
+            
+            // MUSIC SYMBOL #3            
+            uLCD.filled_rectangle(87,76,102,78, PINK);
+            uLCD.filled_rectangle(87,76,89,91,PINK);
+            uLCD.filled_rectangle(100,76,102,91,PINK);
+            uLCD.filled_circle(86,91,3,PINK);
+            uLCD.filled_circle(99,91,3,PINK);   
+            
+            
+ 
+            // Print STOP message
+            uLCD.color(RED);           
+            uLCD.text_width(1.0);
+            uLCD.text_height(1.0);       
+            uLCD.locate(1,14);
+            uLCD.printf(" Hit STOP to end");
+            
+        }
+    
+}
+
+void get_song() {
+
+    // Read value
+    int value=mpr121.read(0x00);
+    value +=mpr121.read(0x01)<<8;
+ 
+    // Match keypad value to number   
+    switch (value) {
+        case 2:
+            keypad = 1;
+            break;
+        case 4:
+            keypad = 2;
+            break;
+        case 8:
+            keypad = 3;
+            break;
+        case 16:
+            keypad = 4;
+            break;
+        case 32:
+            keypad = 5;
+            break;
+        case 64:
+            keypad = 6;
+            break;
+        case 128:
+            keypad = 7;
+            break;
+        case 256:
+            keypad = 8;
+            break;
+        case 512:
+            keypad = 9;
+            break;
+        case 1024:
+            keypad = 10;
+            break;
+       }
+             
+       update_screen(2);
+
+}
+
+
+void play_song() {
+    
     FILE *wave_file;
-    printf("\r\n\nHello, wave world!\n\r");
-    Thread::wait(1000);
-    wave_file=fopen("/sd/sample.wav","r");
-    if(wave_file==NULL) printf("file open error!\n\n\r");
-    waver.play(wave_file);
-    fclose(wave_file);
+    switch (keypad) {
+        case 1:
+            wave_file=fopen("/sd/wavfiles/dura.wav","r");
+            title = "      Dura";
+            artist = "  Daddy Yankee";
+            title_size = 1;
+            artist_size = 1;
+            break;
+        case 2:
+            wave_file=fopen("/sd/wavfiles/despacito.wav","r");
+            title = "    Despacito";
+            artist = "    Luis Fonsi";
+            title_size = 1;
+            artist_size = 1;
+            break;
+        case 3:
+            wave_file=fopen("/sd/wavfiles/disco.wav","r");
+            title = "      Disco";
+            artist = "  Maxine Night";
+            title_size = 1;
+            artist_size = 1;
+            break;
+        case 4:
+            wave_file=fopen("/sd/wavfiles/california.wav","r");
+            title = "   California";
+            artist = "     Phantom  ";
+            title_size = 1;
+            artist_size = 1;
+            break;
+        case 5:
+            wave_file=fopen("/sd/wavfiles/christmas.wav","r");
+            title = "   All I Want";
+            artist = "  Mariah Carey";
+            title_size = 1;
+            artist_size = 1;
+            break;
+        case 6:
+            wave_file=fopen("/sd/wavfiles/beethoven.wav","r");
+            title = "   Symphony 9";
+            artist = "    Beethoven";
+            title_size = 1;
+            artist_size = 1;
+            break;
+        case 7:
+            wave_file=fopen("/sd/wavfiles/queen.wav","r");
+            title = "    Rock You";
+            artist = "      Queen";
+            title_size = 1;
+            artist_size = 1;
+            break;
+        case 8:
+            wave_file=fopen("/sd/wavfiles/losing_it.wav","r");
+            title = "    Losing It";
+            artist = "     Fisher";
+            title_size = 1;
+            artist_size = 1;
+            break;
+        case 9:
+            wave_file=fopen("/sd/wavfiles/better_not.wav","r");
+            title = "   Better Not";
+            artist = "    Louis TC";
+            title_size = 1;
+            artist_size = 1;
+            break;
+        case 10:
+            wave_file=fopen("/sd/wavfiles/drinkee.wav","r");
+            title = "     Drinkee";
+            artist = "   Sofi Tukker";
+            title_size = 1;
+            artist_size = 1;
+            break;
+       }
+        update_screen(3);     
+        waver.play(wave_file);      
+        fclose(wave_file);
+
+        
+
+}
+
+
+void stop_song() {
+    
+        play = false; 
+        
+
+}
+
+
+
+int main(){
+        
+        
+        interrupt.mode(PullUp);
+        start.mode(PullUp);
+        interrupt.fall(&key);
+        start.fall(&b1);
+        stop.mode(PullUp);
+        wait_ms(10);
+        stop.attach_deasserted(&stop_song);
+        stop.setSampleFrequency();
+        
+        
+        
+        
+        while(1) { // One jukebox cycle
+        
+            
+            // Reset, draw menu screen
+            keypad = 0;
+            update_screen(1);
+    
+            // Wait for user to select song AND press play        
+            while ((keypad == 0)||(play==false)) {
+                if (newKey) {
+                    newKey = false;
+                    get_song();                  
+                }
+            }
+    
+            play_song();            
+
+            // Reset values before starting again                
+            play = false;
+            newKey = false;
+            keypad = 0;
+            
+            
+            
+        }
+
+    
+    
 }
\ No newline at end of file
diff -r c2afd0c426af -r 74066405c9fc mbed-rtos.lib
--- a/mbed-rtos.lib	Tue Apr 18 13:00:09 2017 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,1 +0,0 @@
-http://developer.mbed.org/users/mbed_official/code/mbed-rtos/#02f5cf381388
diff -r c2afd0c426af -r 74066405c9fc mpr121.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mpr121.cpp	Wed Dec 12 05:17:58 2018 +0000
@@ -0,0 +1,221 @@
+/*
+Copyright (c) 2011 Anthony Buckton (abuckton [at] blackink [dot} net {dot} au)
+ 
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+ 
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+ 
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+#include <mbed.h>
+#include <sstream>
+#include <string>
+#include <list>
+
+#include <mpr121.h>
+    
+Mpr121::Mpr121(I2C *i2c, Address i2cAddress)
+{
+    this->i2c = i2c;
+    
+    address = i2cAddress;
+           
+    // Configure the MPR121 settings to default
+    this->configureSettings();
+}
+
+   
+void Mpr121::configureSettings()
+{
+    // Put the MPR into setup mode
+    this->write(ELE_CFG,0x00);
+    
+    // Electrode filters for when data is > baseline
+    unsigned char gtBaseline[] = {
+         0x01,  //MHD_R
+         0x01,  //NHD_R 
+         0x00,  //NCL_R
+         0x00   //FDL_R
+         };
+         
+    writeMany(MHD_R,gtBaseline,4);   
+                 
+     // Electrode filters for when data is < baseline   
+     unsigned char ltBaseline[] = {
+        0x01,   //MHD_F
+        0x01,   //NHD_F
+        0xFF,   //NCL_F
+        0x02    //FDL_F
+        };
+        
+    writeMany(MHD_F,ltBaseline,4);
+        
+    // Electrode touch and release thresholds
+    unsigned char electrodeThresholds[] = {
+        E_THR_T, // Touch Threshhold
+        E_THR_R  // Release Threshold
+        };
+
+    for(int i=0; i<12; i++){
+        int result = writeMany((ELE0_T+(i*2)),electrodeThresholds,2);
+    }   
+
+    // Proximity Settings
+    unsigned char proximitySettings[] = {
+        0xff,   //MHD_Prox_R
+        0xff,   //NHD_Prox_R
+        0x00,   //NCL_Prox_R
+        0x00,   //FDL_Prox_R
+        0x01,   //MHD_Prox_F
+        0x01,   //NHD_Prox_F
+        0xFF,   //NCL_Prox_F
+        0xff,   //FDL_Prox_F
+        0x00,   //NHD_Prox_T
+        0x00,   //NCL_Prox_T
+        0x00    //NFD_Prox_T
+        };
+    writeMany(MHDPROXR,proximitySettings,11);
+
+    unsigned char proxThresh[] = {
+        PROX_THR_T, // Touch Threshold
+        PROX_THR_R  // Release Threshold
+        };
+    writeMany(EPROXTTH,proxThresh,2); 
+       
+    this->write(FIL_CFG,0x04);
+    
+    // Set the electrode config to transition to active mode
+    this->write(ELE_CFG,0x0c);
+}
+
+void Mpr121::setElectrodeThreshold(int electrode, unsigned char touch, unsigned char release){
+    
+    if(electrode > 11) return;
+    
+    // Get the current mode
+    unsigned char mode = this->read(ELE_CFG);
+    
+    // Put the MPR into setup mode
+    this->write(ELE_CFG,0x00);
+    
+    // Write the new threshold
+    this->write((ELE0_T+(electrode*2)), touch);
+    this->write((ELE0_T+(electrode*2)+1), release);
+    
+    //Restore the operating mode
+    this->write(ELE_CFG, mode);
+}
+    
+    
+unsigned char Mpr121::read(int key){
+
+    unsigned char data[2];
+    
+    //Start the command
+    i2c->start();
+
+    // Address the target (Write mode)
+    int ack1= i2c->write(address);
+
+    // Set the register key to read
+    int ack2 = i2c->write(key);
+
+    // Re-start for read of data
+    i2c->start();
+
+    // Re-send the target address in read mode
+    int ack3 = i2c->write(address+1);
+
+    // Read in the result
+    data[0] = i2c->read(0); 
+
+    // Reset the bus        
+    i2c->stop();
+
+    return data[0];
+}
+
+
+int Mpr121::write(int key, unsigned char value){
+    
+    //Start the command
+    i2c->start();
+
+    // Address the target (Write mode)
+    int ack1= i2c->write(address);
+
+    // Set the register key to write
+    int ack2 = i2c->write(key);
+
+    // Read in the result
+    int ack3 = i2c->write(value); 
+
+    // Reset the bus        
+    i2c->stop();
+    
+    return (ack1+ack2+ack3)-3;
+}
+
+
+int Mpr121::writeMany(int start, unsigned char* dataSet, int length){
+    //Start the command
+    i2c->start();
+
+    // Address the target (Write mode)
+    int ack= i2c->write(address);
+    if(ack!=1){
+        return -1;
+    }
+    
+    // Set the register key to write
+    ack = i2c->write(start);
+    if(ack!=1){
+        return -1;
+    }
+
+    // Write the date set
+    int count = 0;
+    while(ack==1 && (count < length)){
+        ack = i2c->write(dataSet[count]);
+        count++;
+    } 
+    // Stop the cmd
+    i2c->stop();
+    
+    return count;
+}
+      
+
+bool Mpr121::getProximityMode(){
+    if(this->read(ELE_CFG) > 0x0c)
+        return true;
+    else
+        return false;
+}
+
+void Mpr121::setProximityMode(bool mode){
+    this->write(ELE_CFG,0x00);
+    if(mode){
+        this->write(ELE_CFG,0x30); //Sense proximity from ALL pads
+    } else {
+        this->write(ELE_CFG,0x0c); //Sense touch, all 12 pads active.
+    }
+}
+
+
+int Mpr121::readTouchData(){
+    return this->read(0x00);
+}
\ No newline at end of file
diff -r c2afd0c426af -r 74066405c9fc mpr121.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mpr121.h	Wed Dec 12 05:17:58 2018 +0000
@@ -0,0 +1,157 @@
+/*
+Copyright (c) 2011 Anthony Buckton (abuckton [at] blackink [dot} net {dot} au)
+
+ 
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+ 
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+ 
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+   Parts written by Jim Lindblom of Sparkfun
+   Ported to mbed by A.Buckton, Feb 2011
+*/
+
+#ifndef MPR121_H
+#define MPR121_H
+
+//using namespace std;
+
+class Mpr121 
+{
+
+public:
+    // i2c Addresses, bit-shifted
+    enum Address { ADD_VSS = 0xb4,// ADD->VSS = 0x5a <-wiring on Sparkfun board
+                   ADD_VDD = 0xb6,// ADD->VDD = 0x5b
+                   ADD_SCL = 0xb8,// ADD->SDA = 0x5c
+                   ADD_SDA = 0xba // ADD->SCL = 0x5d
+                 };
+
+    // Real initialiser, takes the i2c address of the device.
+    Mpr121(I2C *i2c, Address i2cAddress);
+    
+    bool getProximityMode();
+    
+    void setProximityMode(bool mode);
+    
+    int readTouchData();
+               
+    unsigned char read(int key);
+    
+    int write(int address, unsigned char value);
+    int writeMany(int start, unsigned char* dataSet, int length);
+
+    void setElectrodeThreshold(int electrodeId, unsigned char touchThreshold, unsigned char releaseThreshold);
+        
+protected:
+    // Configures the MPR with standard settings. This is permitted to be overwritten by sub-classes.
+    void configureSettings();
+    
+private:
+    // The I2C bus instance.
+    I2C *i2c;
+
+    // i2c address of this mpr121
+    Address address;
+};
+
+
+// MPR121 Register Defines
+#define    MHD_R        0x2B
+#define    NHD_R        0x2C
+#define    NCL_R        0x2D
+#define    FDL_R        0x2E
+#define    MHD_F        0x2F
+#define    NHD_F        0x30
+#define    NCL_F        0x31
+#define    FDL_F        0x32
+#define    NHDT         0x33
+#define    NCLT         0x34
+#define    FDLT         0x35
+// Proximity sensing controls
+#define    MHDPROXR     0x36
+#define    NHDPROXR     0x37
+#define    NCLPROXR     0x38
+#define    FDLPROXR     0x39
+#define    MHDPROXF     0x3A
+#define    NHDPROXF     0x3B
+#define    NCLPROXF     0x3C
+#define    FDLPROXF     0x3D
+#define    NHDPROXT     0x3E
+#define    NCLPROXT     0x3F
+#define    FDLPROXT     0x40
+// Electrode Touch/Release thresholds
+#define    ELE0_T       0x41
+#define    ELE0_R       0x42
+#define    ELE1_T       0x43
+#define    ELE1_R       0x44
+#define    ELE2_T       0x45
+#define    ELE2_R       0x46
+#define    ELE3_T       0x47
+#define    ELE3_R       0x48
+#define    ELE4_T       0x49
+#define    ELE4_R       0x4A
+#define    ELE5_T       0x4B
+#define    ELE5_R       0x4C
+#define    ELE6_T       0x4D
+#define    ELE6_R       0x4E
+#define    ELE7_T       0x4F
+#define    ELE7_R       0x50
+#define    ELE8_T       0x51
+#define    ELE8_R       0x52
+#define    ELE9_T       0x53
+#define    ELE9_R       0x54
+#define    ELE10_T      0x55
+#define    ELE10_R      0x56
+#define    ELE11_T      0x57
+#define    ELE11_R      0x58
+// Proximity Touch/Release thresholds
+#define    EPROXTTH     0x59
+#define    EPROXRTH     0x5A
+// Debounce configuration
+#define    DEB_CFG      0x5B
+// AFE- Analogue Front End configuration
+#define    AFE_CFG      0x5C 
+// Filter configuration
+#define    FIL_CFG      0x5D
+// Electrode configuration - transistions to "active mode"
+#define    ELE_CFG      0x5E
+
+#define GPIO_CTRL0      0x73
+#define GPIO_CTRL1      0x74
+#define GPIO_DATA       0x75
+#define    GPIO_DIR     0x76
+#define    GPIO_EN      0x77
+#define    GPIO_SET     0x78
+#define GPIO_CLEAR      0x79
+#define GPIO_TOGGLE     0x7A
+// Auto configration registers
+#define    AUTO_CFG_0   0x7B
+#define    AUTO_CFG_U   0x7D
+#define    AUTO_CFG_L   0x7E
+#define    AUTO_CFG_T   0x7F
+
+// Threshold defaults
+// Electrode touch threshold
+#define    E_THR_T      0x0F   
+// Electrode release threshold 
+#define    E_THR_R      0x0A    
+// Prox touch threshold
+#define    PROX_THR_T   0x02
+// Prox release threshold
+#define    PROX_THR_R   0x02
+
+#endif
diff -r c2afd0c426af -r 74066405c9fc wave_player.lib
--- a/wave_player.lib	Tue Apr 18 13:00:09 2017 +0000
+++ b/wave_player.lib	Wed Dec 12 05:17:58 2018 +0000
@@ -1,1 +1,1 @@
-http://mbed.org/users/sravet/code/wave_player/#acc3e18e77ad
+https://os.mbed.com/users/jrod1096/code/wave_player/#b3124879f219