int btn1 = 6; // pins for buttons connected to Arduino
int btn2 = 5;
int bt1Val, bt2Val; // value is TRUE if button pressed, FALSE
                    // if no press
long btThresh = 100; // time between button presses is 1/10 of a second
long lastBt1 = millis();// current system time
long lastBt2 = millis();
int led1 = 11; // first LED


void setup() {
  pinMode(btn1, INPUT); // set the button pins as INPUTS
  pinMode(btn2, INPUT);
  pinMode(led1, OUTPUT);// set the LED pins as OUTPUTS
  digitalWrite(led1, LOW);// turn OFF the LEDs
  Serial.begin(9600);
}

void loop() {
  // scan the buttons for presses
  bt1Val = digitalRead(btn1);
  
  bt2Val = digitalRead(btn2);
  if (bt1Val) {  // if the button state is HIGH
    if (millis() - lastBt1 > btThresh) { // if the minimum of time has passed
      // since the last button 1 press
      digitalWrite(led1, HIGH); //turn LED1 ON
    Serial.println("activate");
      lastBt1 = millis(); //reset for next button press
    }
  }
  if (bt2Val) { // if the button state is HIGH
    if (millis() - lastBt2 > btThresh) { // if the minimum of time has passed
      // since the last button 1 press
      digitalWrite(led1, LOW); //turn LED1 OFF
      lastBt2 = millis(); //reset for next button press
    }
  }
  delay(50); // slow down sketch a bit
}