Hi,

I'm new in using teensy 3.1. I've been trying to run the examples given in arduino examples. However, I could not get any audio output from the teensy audio shield when I pluck in my ear piece. Can anyone tell me which part of the code should I edit to get the audio output from the headphone?

Thank You

// Dial Tone (DTMF) decoding example.
//
// The audio with dial tones is connected to audio shield
// Left Line-In pin. Dial tone output is produced on the
// Line-Out and headphones.
//
// Use the Arduino Serial Monitor to watch for incoming
// dial tones, and to send digits to be played as dial tones.
//
// This example code is in the public domain.


#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>

// Create the Audio components. These should be created in the
// order data flows, inputs/sources -> processing -> outputs
//
AudioInputI2S audioInput;
AudioAnalyzeToneDetect row1; // 7 tone detectors are needed
AudioAnalyzeToneDetect row2; // to receive DTMF dial tones
AudioAnalyzeToneDetect row3;
AudioAnalyzeToneDetect row4;
AudioAnalyzeToneDetect column1;
AudioAnalyzeToneDetect column2;
AudioAnalyzeToneDetect column3;
AudioSynthWaveformSine sine1; // 2 sine wave
AudioSynthWaveformSine sine2; // to create DTMF
AudioMixer4 mixer;
AudioOutputI2S audioOutput;

// Create Audio connections between the components
//
AudioConnection patchCord01(audioIn, 0, row1, 0);
AudioConnection patchCord02(audioIn, 0, row2, 0);
AudioConnection patchCord03(audioIn, 0, row3, 0);
AudioConnection patchCord04(audioIn, 0, row4, 0);
AudioConnection patchCord05(audioIn, 0, column1, 0);
AudioConnection patchCord06(audioIn, 0, column2, 0);
AudioConnection patchCord07(audioIn, 0, column3, 0);
AudioConnection patchCord10(sine1, 0, mixer, 0);
AudioConnection patchCord11(sine2, 0, mixer, 1);
AudioConnection patchCord12(mixer, 0, audioOut, 0);
AudioConnection patchCord13(mixer, 0, audioOut, 1);

// Create an object to control the audio shield.
//
AudioControlSGTL5000 audioShield;


void setup() {
// Audio connections require memory to work. For more
// detailed information, see the MemoryAndCpuUsage example
AudioMemory(12);

// Enable the audio shield and set the output volume.
audioShield.enable();
audioShield.volume(0.5);

while (!Serial) ;
delay(100);

// Configure the tone detectors with the frequency and number
// of cycles to match. These numbers were picked for match
// times of approx 30 ms. Longer times are more precise.
row1.frequency(697, 21);
row2.frequency(770, 23);
row3.frequency(852, 25);
row4.frequency(941, 28);
column1.frequency(1209, 36);
column2.frequency(1336, 40);
column3.frequency(1477, 44);
}

const float row_threshold = 0.2;
const float column_threshold = 0.2;

void loop() {
float r1, r2, r3, r4, c1, c2, c3;
char digit=0;

// read all seven tone detectors
r1 = row1.read();
r2 = row2.read();
r3 = row3.read();
r4 = row4.read();
c1 = column1.read();
c2 = column2.read();
c3 = column3.read();

// print the raw data, for troubleshooting
Serial.print("tones: ");
Serial.print(r1);
Serial.print(", ");
Serial.print(r2);
Serial.print(", ");
Serial.print(r3);
Serial.print(", ");
Serial.print(r4);
Serial.print(", ");
Serial.print(c1);
Serial.print(", ");
Serial.print(c2);
Serial.print(", ");
Serial.print(c3);

// check all 12 combinations for key press
if (r1 >= row_threshold) {
if (c1 > column_threshold) {
digit = '1';
} else if (c2 > column_threshold) {
digit = '2';
} else if (c3 > column_threshold) {
digit = '3';
}
} else if (r2 >= row_threshold) {
if (c1 > column_threshold) {
digit = '4';
} else if (c2 > column_threshold) {
digit = '5';
} else if (c3 > column_threshold) {
digit = '6';
}
} else if (r3 >= row_threshold) {
if (c1 > column_threshold) {
digit = '7';
} else if (c2 > column_threshold) {
digit = '8';
} else if (c3 > column_threshold) {
digit = '9';
}
} else if (r4 >= row_threshold) {
if (c1 > column_threshold) {
digit = '*';
} else if (c2 > column_threshold) {
digit = '0';
} else if (c3 > column_threshold) {
digit = '#';
}
}

// print the key, if any found
if (digit > 0) {
Serial.print(" --> Key: ");
Serial.print(digit);
}
Serial.println();

// uncomment these lines to see how much CPU time
// the tone detectors and audio library are using
//Serial.print("CPU=");
//Serial.print(AudioProcessorUsage());
//Serial.print("%, max=");
//Serial.print(AudioProcessorUsageMax());
//Serial.print("% ");

// check if any data has arrived from the serial monitor
if (Serial.available()) {
char key = Serial.read();
int low=0;
int high=0;
if (key == '1') {
low = 697;
high = 1209;
} else if (key == '2') {
low = 697;
high = 1336;
} else if (key == '3') {
low = 697;
high = 1477;
} else if (key == '4') {
low = 770;
high = 1209;
} else if (key == '5') {
low = 770;
high = 1336;
} else if (key == '6') {
low = 770;
high = 1477;
} else if (key == '7') {
low = 852;
high = 1209;
} else if (key == '8') {
low = 852;
high = 1336;
} else if (key == '9') {
low = 852;
high = 1477;
} else if (key == '*') {
low = 941;
high = 1209;
} else if (key == '0') {
low = 941;
high = 1336;
} else if (key == '#') {
low = 941;
high = 1477;
}

// play the DTMF tones, if characters send from the Arduino Serial Monitor
if (low > 0 && high > 0) {
Serial.print("Output sound for key ");
Serial.print(key);
Serial.print(", low freq=");
Serial.print(low);
Serial.print(", high freq=");
Serial.print(high);
Serial.println();
AudioNoInterrupts(); // disable audio library momentarily
sine1.frequency(low);
sine1.amplitude(0.4);
sine2.frequency(high);
sine2.amplitude(0.45);
AudioInterrupts(); // enable, both tones will start together
delay(100); // let the sound play for 0.1 second
AudioNoInterrupts();
sine1.amplitude(0);
sine2.amplitude(0);
AudioInterrupts();
delay(50); // make sure we have 0.05 second silence after
}
}

delay(25);
}