Water Softener

Timer2 in the Atmega is setup to output 50% duty cycle. The delay can be increased to slow the sweep. OCR2A sets the frequency, 10=25KHz and 255=1KHz. Frequencies can be changed.

1/*
2 *  Sweeping frequency water softener
3 * Created: 15/01/2017  23:34:47
4 *  Author: moty22.co.uk
5 */ 
6
7
8void setup() {
9  // put  your setup code here, to run once:
10
11    //timer2
12  OCR2A = 127;  //50%  duty cycle 
13  TCCR2A = _BV(COM2A0) | _BV(WGM21) | _BV(WGM20);  //toggle output,  fast PWM mode 
14  TCCR2B = _BV(WGM22) | _BV(CS21) | _BV(CS20); //   fast PWM mode,  prescale 1:64
15  pinMode(11, OUTPUT);
16
17}
18
19void loop()
20{
21
22  delay(200);   //duration of each frequency
23  OCR2A += 10;    //step size of  frequency change
24  if(OCR2A >= 245){OCR2A = 10; }  //range of sweep, 245 is max.  
25 
26}
27
28
29

/*
 *  Sweeping frequency water softener
 * Created: 15/01/2017  23:34:47
 *  Author: moty22.co.uk
 */ 


void setup() {
  // put  your setup code here, to run once:

    //timer2
  OCR2A = 127;  //50%  duty cycle 
  TCCR2A = _BV(COM2A0) | _BV(WGM21) | _BV(WGM20);  //toggle output,  fast PWM mode 
  TCCR2B = _BV(WGM22) | _BV(CS21) | _BV(CS20); //   fast PWM mode,  prescale 1:64
  pinMode(11, OUTPUT);

}

void loop()
{

  delay(200);   //duration of each frequency
  OCR2A += 10;    //step size of  frequency change
  if(OCR2A >= 245){OCR2A = 10; }  //range of sweep, 245 is max.  
 
}

Downloadable files

softener2

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