#define Pinsw1  23
#define Pinsw2  22
#define Pinsw3  19
#define Pinsw4  18

#define led1   16
#define led2    4
#define led3    0

int sw1;
int lest_sw1 = HIGH;
int sw2;
int lest_sw2 = HIGH;
int sw3;
int lest_sw3 = HIGH;
int sw4;
int lest_sw4 = HIGH;

bool ledstate1 = LOW;
bool ledstate2 = LOW;
bool ledstate3 = LOW;
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 50;

void setup(){
  Serial.begin(115200);
  pinMode(Pinsw1 , INPUT);
  pinMode(Pinsw2 , INPUT);
  pinMode(Pinsw3 , INPUT);
  pinMode(Pinsw4 , INPUT);

  pinMode(led1 , OUTPUT);
  pinMode(led2 , OUTPUT);
  pinMode(led3, OUTPUT);
 
}

void loop() {
  //---------------------------Pinsw1---------------------
  int reading1 = digitalRead(Pinsw1);
  if (reading1 != lest_sw1) {
    lastDebounceTime = millis();
  }
  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading1 != sw1) {
      sw1 = reading1;
      if (sw1 == LOW) {
        if(digitalRead(Pinsw1) == 0){  //ให้เงื่อนไข Pinsw1
            ledstate1 = !(ledstate1);    //กดแล้ว ไฟLED จะเปิด 
        }
      }
    }
  }
  lest_sw1 = reading1;
  //---------------------------Pinsw2---------------------
  int reading2 = digitalRead(Pinsw2);
  if (reading2 != lest_sw2) {
    lastDebounceTime = millis();
  }
  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading2 != sw2) {
      sw2 = reading2;
      if (sw2 == LOW) {
        if(digitalRead(Pinsw2) == 0){
           ledstate2 = !(ledstate2);
        }
      }
    }
  }
  lest_sw2 = reading2;
  //---------------------------Pinsw3---------------------
  int reading3 = digitalRead(Pinsw3);
  if (reading3 != lest_sw3) {
    lastDebounceTime = millis();
  }
  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading3 != sw3) {
      sw3 = reading3;
      if (sw3 == LOW) {
        if(digitalRead(Pinsw3) == 0){
          ledstate3 = !(ledstate3);
        }
      }
    }
  }
  lest_sw3 = reading3;
  //---------------------------Pinsw4---------------------
  int reading4 = digitalRead(Pinsw4);
  if (reading4 != lest_sw4) {
    lastDebounceTime = millis();
  }
  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading4 != sw4) {
      sw4 = reading4;
      if (sw4 == LOW) {
        if(digitalRead(Pinsw4) == 0){
           ledstate1 = !(ledstate1);
           ledstate2 = !(ledstate2);
           ledstate3 = !(ledstate3);
       }
      }
    }
  }
  lest_sw4 = reading4;

  digitalWrite(led1,ledstate1);  //ไฟ LED เปิดตลอด (ตัวแปร ledstate1=LOW จะให้)
  digitalWrite(led2,ledstate2);
  digitalWrite(led3,ledstate3);
}