/************************************************************
* Water Atomization Module BM52O5221-1 example code
* Arduino IDE version: 1.8.13
* Arduino Board: UNO R3
* Wire Connection:
*   BM52O5221-1 module pin 1 (GND) connects to POWER GND
*   BM52O5221-1 module pin 2 (24V) connects to POWER 24V
*   BM52O5221-1 module pin 3 (DATA_IN) connects to UNO pin 9
*   BM52O5221-1 module pin 4 (WATER_DET) connects to UNO pin 8
*   BM52O5221-1 module pin 5 (FAN_DRV) connects to FAN
*   BM52O5221-1 module pin 6 (SW/VR) no connection required
*   
* Created on 2022/02/23 by Best Modules Corp.
*************************************************************/

#define DATA_IN 9     
#define WATER_DET 8     
#define BUTTON  2
volatile boolean i = LOW; 

void setup() 
{ 
  TCCR1B = TCCR1B & 0xF8 | 5;   //PWM Frequency = 30.637 Hz
  
// PWM mode [PIN3:PIN4] = 1,0
  pinMode(DATA_IN, OUTPUT); 
  pinMode(WATER_DET, OUTPUT);  
  pinMode(BUTTON, INPUT);
  digitalWrite(DATA_IN, HIGH);
  digitalWrite(WATER_DET, LOW);
  digitalWrite(BUTTON, LOW);
}

void loop() 
{
  attachInterrupt(digitalPinToInterrupt(BUTTON), SetFlag, RISING);
  
  if(i==HIGH) analogWrite(DATA_IN, 127);    //duty cycle = 50%
  else analogWrite(DATA_IN, 255);    //duty cycle = 100%
}

void SetFlag()
{
  pinMode(WATER_DET, INPUT);  // sets the pin as intput
  i=!i;
}