Dial tone example using only analog input (no audio shield)

examples/DialTone_7segment/DialTone_7segment.ino

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+// Dial Tone (DTMF) decoding example.
+//
+// The audio with dial tones is connected to analog input A0,
+// without using the audio shield.  See the "DialTone_DTMF"
+// example for using the audio shield.
+
+#include <Audio.h>
+#include <Wire.h>
+#include <SD.h>
+
+// Create the Audio components.  These should be created in the
+// order data flows, inputs/sources -> processing -> outputs
+//
+AudioInputAnalog         audioIn(A0);
+AudioAnalyzeToneDetect   row1;     // 7 tone detectors are needed
+AudioAnalyzeToneDetect   row2;     // to receive DTMF dial tones
+AudioAnalyzeToneDetect   row3;
+AudioAnalyzeToneDetect   row4;
+AudioAnalyzeToneDetect   column1;
+AudioAnalyzeToneDetect   column2;
+AudioAnalyzeToneDetect   column3;
+
+// Create Audio connections between the components
+//
+AudioConnection c01(audioIn, 0, row1, 0);
+AudioConnection c02(audioIn, 0, row2, 0);
+AudioConnection c03(audioIn, 0, row3, 0);
+AudioConnection c04(audioIn, 0, row4, 0);
+AudioConnection c05(audioIn, 0, column1, 0);
+AudioConnection c06(audioIn, 0, column2, 0);
+AudioConnection c07(audioIn, 0, column3, 0);
+
+// pins where the 7 segment LEDs are connected
+const int sevenseg_a = 17;   //  aaa
+const int sevenseg_b = 9;    // f   b
+const int sevenseg_c = 11;   // f   b
+const int sevenseg_d = 12;   //  ggg
+const int sevenseg_e = 15;   // e   c
+const int sevenseg_f = 16;   // e   c
+const int sevenseg_g = 10;   //  ddd
+
+
+void setup() {
+  // Audio connections require memory to work.  For more
+  // detailed information, see the MemoryAndCpuUsage example
+  AudioMemory(3);
+  
+  //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);
+  
+  // The 7 segment display is "common anode), where the
+  // common pin connects to +3.3V.  LOW turns the LED on
+  // and HIGH turns the LED off.  If you use a common
+  // cathode display, you will need to change all the HIGH
+  // to LOW and LOW to HIGH.
+  pinMode(sevenseg_a, OUTPUT);
+  pinMode(sevenseg_b, OUTPUT);
+  pinMode(sevenseg_c, OUTPUT);
+  pinMode(sevenseg_d, OUTPUT);
+  pinMode(sevenseg_e, OUTPUT);
+  pinMode(sevenseg_f, OUTPUT);
+  pinMode(sevenseg_g, OUTPUT);
+  digitalWrite(sevenseg_a, HIGH);
+  digitalWrite(sevenseg_b, HIGH);
+  digitalWrite(sevenseg_c, HIGH);
+  digitalWrite(sevenseg_d, HIGH);
+  digitalWrite(sevenseg_e, HIGH);
+  digitalWrite(sevenseg_f, HIGH);
+  digitalWrite(sevenseg_g, HIGH);
+}
+
+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';
+      digitalWrite(sevenseg_a, HIGH);
+      digitalWrite(sevenseg_b, LOW);
+      digitalWrite(sevenseg_c, LOW);
+      digitalWrite(sevenseg_d, HIGH);
+      digitalWrite(sevenseg_e, HIGH);
+      digitalWrite(sevenseg_f, HIGH);
+      digitalWrite(sevenseg_g, HIGH);
+    } else if (c2 > column_threshold) {
+      digit = '2';
+      digitalWrite(sevenseg_a, LOW);
+      digitalWrite(sevenseg_b, LOW);
+      digitalWrite(sevenseg_c, HIGH);
+      digitalWrite(sevenseg_d, LOW);
+      digitalWrite(sevenseg_e, LOW);
+      digitalWrite(sevenseg_f, HIGH);
+      digitalWrite(sevenseg_g, LOW);
+    } else if (c3 > column_threshold) {
+      digit = '3';
+      digitalWrite(sevenseg_a, LOW);
+      digitalWrite(sevenseg_b, LOW);
+      digitalWrite(sevenseg_c, LOW);
+      digitalWrite(sevenseg_d, LOW);
+      digitalWrite(sevenseg_e, HIGH);
+      digitalWrite(sevenseg_f, HIGH);
+      digitalWrite(sevenseg_g, LOW);
+    }
+  } else if (r2 >= row_threshold) { 
+    if (c1 > column_threshold) {
+      digit = '4';
+      digitalWrite(sevenseg_a, HIGH);
+      digitalWrite(sevenseg_b, LOW);
+      digitalWrite(sevenseg_c, LOW);
+      digitalWrite(sevenseg_d, HIGH);
+      digitalWrite(sevenseg_e, HIGH);
+      digitalWrite(sevenseg_f, LOW);
+      digitalWrite(sevenseg_g, LOW);
+    } else if (c2 > column_threshold) {
+      digit = '5';
+      digitalWrite(sevenseg_a, LOW);
+      digitalWrite(sevenseg_b, HIGH);
+      digitalWrite(sevenseg_c, LOW);
+      digitalWrite(sevenseg_d, LOW);
+      digitalWrite(sevenseg_e, HIGH);
+      digitalWrite(sevenseg_f, LOW);
+      digitalWrite(sevenseg_g, LOW);
+    } else if (c3 > column_threshold) {
+      digit = '6';
+      digitalWrite(sevenseg_a, LOW);
+      digitalWrite(sevenseg_b, HIGH);
+      digitalWrite(sevenseg_c, LOW);
+      digitalWrite(sevenseg_d, LOW);
+      digitalWrite(sevenseg_e, LOW);
+      digitalWrite(sevenseg_f, LOW);
+      digitalWrite(sevenseg_g, LOW);
+    }
+  } else if (r3 >= row_threshold) { 
+    if (c1 > column_threshold) {
+      digit = '7';
+      digitalWrite(sevenseg_a, LOW);
+      digitalWrite(sevenseg_b, LOW);
+      digitalWrite(sevenseg_c, LOW);
+      digitalWrite(sevenseg_d, HIGH);
+      digitalWrite(sevenseg_e, HIGH);
+      digitalWrite(sevenseg_f, HIGH);
+      digitalWrite(sevenseg_g, HIGH);
+    } else if (c2 > column_threshold) {
+      digit = '8';
+      digitalWrite(sevenseg_a, LOW);
+      digitalWrite(sevenseg_b, LOW);
+      digitalWrite(sevenseg_c, LOW);
+      digitalWrite(sevenseg_d, LOW);
+      digitalWrite(sevenseg_e, LOW);
+      digitalWrite(sevenseg_f, LOW);
+      digitalWrite(sevenseg_g, LOW);
+    } else if (c3 > column_threshold) {
+      digit = '9';
+      digitalWrite(sevenseg_a, LOW);
+      digitalWrite(sevenseg_b, LOW);
+      digitalWrite(sevenseg_c, LOW);
+      digitalWrite(sevenseg_d, LOW);
+      digitalWrite(sevenseg_e, HIGH);
+      digitalWrite(sevenseg_f, LOW);
+      digitalWrite(sevenseg_g, LOW);
+    }
+  } else if (r4 >= row_threshold) { 
+    if (c1 > column_threshold) {
+      digit = '*';
+      digitalWrite(sevenseg_a, HIGH);
+      digitalWrite(sevenseg_b, HIGH);
+      digitalWrite(sevenseg_c, HIGH);
+      digitalWrite(sevenseg_d, HIGH);
+      digitalWrite(sevenseg_e, HIGH);
+      digitalWrite(sevenseg_f, HIGH);
+      digitalWrite(sevenseg_g, LOW);
+    } else if (c2 > column_threshold) {
+      digit = '0';
+      digitalWrite(sevenseg_a, LOW);
+      digitalWrite(sevenseg_b, LOW);
+      digitalWrite(sevenseg_c, LOW);
+      digitalWrite(sevenseg_d, LOW);
+      digitalWrite(sevenseg_e, LOW);
+      digitalWrite(sevenseg_f, LOW);
+      digitalWrite(sevenseg_g, HIGH);
+    } else if (c3 > column_threshold) {
+      digit = '#';
+      digitalWrite(sevenseg_a, HIGH);
+      digitalWrite(sevenseg_b, LOW);
+      digitalWrite(sevenseg_c, LOW);
+      digitalWrite(sevenseg_d, HIGH);
+      digitalWrite(sevenseg_e, LOW);
+      digitalWrite(sevenseg_f, LOW);
+      digitalWrite(sevenseg_g, LOW);
+    }
+  }
+
+  // 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("%   ");
+
+  delay(25);
+}
+
+