int led1 = 13;
int led2 = 12;
int led3 = 6;
int sw1 = 2;
bool sw_state=0,last_sw_state,buttonstate=1,change=0;
bool state=0;
unsigned long time1;
int debounceDelay=40;
bool LED1State=0;
unsigned long delayTime1;
unsigned long delayA0;

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

void loop() 
{
  
  if ((millis() - delayA0) > 500)
  {
  int sensorValue = analogRead(A0);
  
  if (sensorValue > 800)
  {
   digitalWrite(led1 , HIGH);
   digitalWrite(led2 , LOW);
   digitalWrite(led3 , LOW);
  }else if(sensorValue <= 800 && sensorValue > 400)
  { 
   digitalWrite(led1 , LOW);
   digitalWrite(led2 , HIGH);
   digitalWrite(led3 , LOW);
  }else
  {
   digitalWrite(led1 , LOW);
   digitalWrite(led2 , LOW);
   digitalWrite(led3 , HIGH);
  }
 
   Serial.print("sensorValue: " );
   Serial.print(sensorValue);
   float volt = sensorValue*5.0/1024;
   Serial.print("  volt:");
   Serial.println(volt);
   delayA0=millis();
  }
}