int buttonPin = 3;
int tipka;
int led = 7;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(led, OUTPUT);
  //pinMode(buttonGreen, INPUT);

}  

void loop() {
  tipka=digitalRead(buttonPin);
  Serial.println(tipka);
  if(digitalRead(buttonPin) == LOW) digitalWrite(led, HIGH);
  else digitalWrite(led, LOW);

}