int led1 = 13;
int led2 = 12;
int led3 = 10;
int sw1 = 2;
int sw2 = 3;
bool sw_state=0,last_sw_state,buttonstate=1,change=0;
bool state=0;
unsigned long time1;


bool sw_state2=0,last_sw_state2,buttonstate2=1,change2=0;
bool state2=0;
unsigned long time2;

int debounceDelay=40;
bool LED1State=0;
unsigned long delayTime1;
unsigned long delayA0;

void setup() 
{
  pinMode(led1,OUTPUT);  
  pinMode(led2,OUTPUT);
  pinMode(led3,OUTPUT);
  pinMode(6,OUTPUT); 
  pinMode(sw1,INPUT_PULLUP);  
  pinMode(sw2,INPUT_PULLUP);
  Serial.begin(115200);
}

void loop() 
{
  checkSW1();
  if(state==0){ digitalWrite(led2,LOW);} 
  else{ digitalWrite(led2,HIGH);}
  
  checkSW2();
  if(state2==0){ digitalWrite(led3,LOW);} 
  else{ digitalWrite(led3,HIGH);}

  if ((millis() - delayTime1) > 1000)
  {
   LED1State=!LED1State;
   digitalWrite(led1, LED1State);
   delayTime1=millis();
  }

  if ((millis() - delayA0) > 800)
  {
   int sensorValue = analogRead(A0);
   int PWM = map(sensorValue,0,1023,0,255);
   analogWrite(6,PWM);
   Serial.print("sensorValue:");
   Serial.print(sensorValue);
   Serial.print(" PWM:");
   Serial.println(PWM);
   delayA0=millis();
  }
}                                                                     


void checkSW1()
{
  sw_state=digitalRead(sw1);
  if(sw_state!= last_sw_state)
  {
    time1=millis();
  }
  if((millis()-time1)>debounceDelay)
  {
    if(buttonstate!=sw_state)
    {
    buttonstate=sw_state;
    change=1;
    }   
  }

  if((buttonstate==0)&&(change==1))
  {
    state=!state; 
    change=0;
  }
  if((buttonstate==1)&&(change==1))
  {
    change=0;
  }
  last_sw_state=sw_state;
}

void checkSW2()
{
  sw_state2=digitalRead(sw2);
  if(sw_state!= last_sw_state)
  {
    time1=millis();
  }
  if((millis()-time1)>debounceDelay)
  {
    if(buttonstate!=sw_state2)
    {
    buttonstate=sw_state2;
    change=1;
    }   
  }

  if((buttonstate==0)&&(change==1))
  {
    state2=!state; 
    change=0;
  }
  if((buttonstate==1)&&(change==1))
  {
    change=0;
  }
  last_sw_state=sw_state;
}