[SOLVED] generating 23Khz from arduino

[aliyesami]

can someone give me the code for generating this frequency from arduino or guide me how to do it ?

thanks

 

[jayanth.devarayanadurga]

Toggle the output pin every 44 us using timer.

 

[amayilsamy]

int outPin = 8;                 // digital pin 8

void setup()
{
  pinMode(outPin, OUTPUT);      // sets the digital pin as output
}

void loop()
{
  digitalWrite(outPin, HIGH);   // sets the pin on
  delayMicroseconds(44);        // pauses for 44 microseconds      
  digitalWrite(outPin, LOW);    // sets the pin off
  delayMicroseconds(44);        // pauses for 44 microseconds

I hope its help you

 

[jayanth.devarayanadurga]

It is better to use Timer interrupts to generate the pulses.

 

[alexan_e]

Toggle the output pin every 44 us using timer.

44us toggle gives a period of 88us which results in a frequency of 11.3 KHz

 

[jayanth.devarayanadurga]

Who mentioned 44 ms? I mentioned 44 us.

 

[alexan_e]

Who mentioned 44 ms? I mentioned 44 us.

yes, my mistake, I meant 44us toggle gives a period of 88us which results in a frequency of 11.3 KHz

 

[jayanth.devarayanadurga]

It is toggle every 22 us.

 

[aliyesami]

so whats the concensus ?

 

[alexan_e]

You mean about the correct delay to use?
I would suggest you try both and check the generated frequency, then you'll see which one is wrong and probably gain some experience which will help you remember the proper period and toggle delay relation for a given frequency.

 

[nagkiller]

(1/23.000)/2= is your result...

Now select the duty cycle...



The result for this is 0,000.043.478 seconds total or cycles 0,000.021.739 seconds by period... <------- EDITED!!!

 

[mathespbe]

22uS timer 'll help you...
also PWM with 50% dutycycle and frequency of 23KHZ (22uS period) can be used...

 

[aliyesami]

what do you think about this method of freq generation ?> i found this browsing on web apparently there is a tone() function in Arduino


void setup() {

}

void loop() {
// turn off tone function for pin 8:
noTone(8);
// play a note on pin 6 for 200 ms:
tone(6, 440, 200);
delay(200);

// turn off tone function for pin 6:
noTone(6);
// play a note on pin 7 for 500 ms:
tone(7, 494, 500);
delay(500);

// turn off tone function for pin 7:
noTone(7);
// play a note on pin 8 for 500 ms:
tone(8, 523, 300);
delay(300);
}