// Start here //////////////////
//Simple SW0 control LED0
//SW0 press => LED0 ON
//SW0 unpress => LED0 OFF
int LED0 = 4;
int SW0 = 5;
bool flag_SW0;
//SW0 press => 0
//SW0 unpress => 1

void setup() {
  Serial1.begin(115200);
  Serial1.println("Hello, Raspberry Pi Pico W!");
  pinMode(LED0, OUTPUT);
  pinMode(SW0, INPUT_PULLUP);
}

void loop() {
flag_SW0 = digitalRead(SW0);

  if(flag_SW0){
    digitalWrite(LED0, LOW);
  }
  else{
  digitalWrite(LED0, HIGH);
  }
} ////////////////////////////