int ledpin = 8;
int buttonPin = 7;
int ledstate = 0;
int lastButtonState = 0;
void setup() {
  // put your setup code here, to run once:
  pinMode(7 , INPUT_PULLUP);
  pinMode(8,OUTPUT);
  Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  int currentbuttonstate = digitalRead(buttonPin);
  if(currentbuttonstate == 1 && lastButtonState == 0){
    ledstate = !ledstate;
  }

  Serial.println(currentbuttonstate);
  digitalWrite(ledpin,ledstate);
  lastButtonState = currentbuttonstate;
  Serial.print("last :");
  Serial.println(lastButtonState);
  delay(100);
}