DTMF DECODER "HW-005" (MT8870 chip) []

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====== DTMF DECODER "HW-005" (MT8870 chip) ======

===== FEATURES =====
  * Power Input: 5V Nominal (4.5V - 5.5V)
  * Onboard 3.5mm jack input Facility
  * MT8870 Based Frequency Decoder
  * 5 Channel Interface
  * Detects 0-9, A-D, *, #
  * LED notifier for Output state
  * 2.54” Pin pitch
  * Board Dimension: 37 x 25 x 12 mm (l x w x h)

==== DOCUMENTATION ====
  * {{ :documentation:electronique:modules_kits:dtmf_decoder:mt8870-dtmf-audio-decoder-module-datasheet.pdf |MT8870 Datasheet}}
  * {{ :documentation:electronique:modules_kits:dtmf_decoder:mt8870-schematic-diagram.pdf |Module Schematic Diagram}}

===== BLOCK DIAGRAM =====

{{:documentation:electronique:modules_kits:dtmf_decoder:dtmf-module_block_diagram.jpg?direct&400|}}

===== PINOUT =====

{{:documentation:electronique:modules_kits:dtmf_decoder:dtmf-decoder-pinout.jpg?direct&600|}}
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{{:documentation:electronique:modules_kits:dtmf_decoder:mt8870-dtmf-audiospeech-decoding-telephone-module.jpg?direct&400|}}


^ PIN ^ FUNCTION              ^ COMMENT                                                                          ^
| Q1  | Binary Bit 1          |                                                                                  |
| Q2  | Binary Bit 2          |                                                                                  |
| Q3  | Binary Bit 3          |                                                                                  |
| Q4  | Binary Bit 4          |                                                                                  |
| StQ | Delayed String Output | Represents Binary Bit 0                                                          |
| <HTML><span style="text-decoration:overline;">StQ</span></HTML> | Power Down Input      |                                                                                  |
| IN  | Inhibit Input         | Logic high inhibits the detection of tones representing characters A, B, C and D |
| VCC | DC Supply Input       | 4.5V - 5.5V (5.0V Nominal)                                                       |
| GND | Ground                |                                                                                  |

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{{:documentation:electronique:modules_kits:dtmf_decoder:mt8870-state.jpg?direct&400|}}
===== INTERFACING =====
{{:documentation:electronique:modules_kits:dtmf_decoder:mt8870-interfacing-diagram.png?direct&600|}}

===== MT-8870 =====
{{:documentation:electronique:modules_kits:dtmf_decoder:mt8870-dtmf-ic-block-diagram.jpg?direct&400|}}
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{{:documentation:electronique:modules_kits:dtmf_decoder:mt8870-dtmf-ic-pinout.png?direct&600|}}
===== CODE SAMPLES =====

==== ARDUINO LIBS ====

  * https://www.arduino.cc/reference//en/libraries/mt8870/
  * https://github.com/RobTillaart/MT8870
==== Sample 1 ====

{{:documentation:electronique:modules_kits:dtmf_decoder:dtmf_interfacing_diagram.png?direct&400|}}
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{{:documentation:electronique:modules_kits:dtmf_decoder:mt8870-circuit-.jpg?direct&400|}}

<code c>
void setup() {
  Serial.begin(9600);
  pinMode(3, INPUT);
  pinMode(4, INPUT);
  pinMode(5, INPUT);
  pinMode(6, INPUT);
  pinMode(7, INPUT);
}

void loop() {
  uint8_t number;
  bool signal ;  
  signal = digitalRead(3);
  if(signal == HIGH)	/* If new pin pressed */
   {
    delay(250);
    number = ( 0x00 | (digitalRead(7)<<0) | (digitalRead(6)<<1) | (digitalRead(5)<<2) | (digitalRead(4)<<3) );
      switch (number)
      {
        case 0x01:
        Serial.println("Pin Pressed : 1");
        break;
        case 0x02:
        Serial.println("Pin Pressed : 2");
        break;
        case 0x03:
        Serial.println("Pin Pressed : 3");
        break;
        case 0x04:
        Serial.println("Pin Pressed : 4");
        break;
        case 0x05:
        Serial.println("Pin Pressed : 5");
        break;
        case 0x06:
        Serial.println("Pin Pressed : 6");
        break;
        case 7:
        Serial.println("Pin Pressed : 7");
        break;
        case 0x08:
        Serial.println("Pin Pressed : 8");
        break;
        case 0x09:
        Serial.println("Pin Pressed : 9");
        break;
        case 0x0A:
        Serial.println("Pin Pressed : 0");
        break;
        case 0x0B:
        Serial.println("Pin Pressed : *");
        break;
        case 0x0C:
        Serial.println("Pin Pressed : #");
        break;    
      }
  }
}
</code>

===== DTMF (Dual Tone Multi Frequency) =====

^  Hz   ^  1209  ^  1336  ^  1477  ^  1633  ^
^  697  |    1   |    2   |    3   |    A   |
^  770  |    4   |    5   |    6   |    B   |  
^  852  |    7   |    8   |    9   |    C   |
^  941  |    *   |    0   |    #   |    D   |
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