Tap and Talk

Tap and Playback

Counts the number of times the speaker is tapped and reports back the number of taps with a series of tones. Works best with larger speakers. Have Fun!

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/*

Reports a tone the number of times a speaker is tapped

Speaker is connected between A0 and ground

Don't push the speaker too hard!!

Add a potentiometer for setting the threshold pulse from speaker

A piezo disk can be used with a 10k resistor in parallel with the disk

the threshold signal must be adjusted for a disk and you can tape

it to a table or box to help it sound louder

Created by Dorian McIntire - dorianmc@gmail.com

*/

byte tapCount = 0;

long int tapTime = millis();

void setup()

{

}

void loop()

{

int sensorValue = analogRead(A0);

if(sensorValue > 5) //detect a tap

  {

    delay(50);

    tapCount = tapCount + 1; //increment tap count

    tapTime = millis(); //record current system time

  } //end if 1

pinMode(A0,OUTPUT);

if (tapTime < (millis() - 400)) //if more than 0.4 seconds have elapsed since last tap

{

  for(int x=0; x < tapCount; x++)

    {

      tone(A0,1500);

      delay(200);

      noTone(A0);

      delay(200);

    }//end for

  pinMode(A0,INPUT);

  tapCount = 0;

}//end if 2

delay(5); // delay in between reads for stability

} // end loop

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Going Further

1.    Use to make a combination lock choose the number of taps for a basic lock or reprogram to enter as many digits as possible for your combination

2.    Use as an input device to select a menu option

3.    Build a calculator using the speaker to input a number