//activity 4 - Interact with the Serial Monitor
int btn1 = 6; // button attached to pin 3
int led1 = 11;// LED 1 on pin 11
int led2 = 10;// LED 2 on pin 10
char val; // value of character received from Serial Monitor
int bt1Val = 0; // start with button NOT pressed
long lastBt1 = millis();
long btThresh = 100;

void setup() {
  pinMode (btn1, INPUT);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  Serial.begin(9600); // open communications between Arduino and Serial
                      // Monitor at 9600 bits-per-second
  digitalWrite(led1, LOW); // make sure both LEDs are OFF
  digitalWrite(led2, LOW);
}
void loop() {
  if (Serial.available()) { // if there is data from the Serial Monitor
                           //available (ie. a character sent)
    val = Serial.read(); // read a byte of data

    switch (val) {  // do an action based on the character typed (val)
      case '1': // if a '1' received
        digitalWrite(led1, HIGH); // turn LED1 ON
        Serial.println("LED 1 ON");
        break;
      case '2': // if a '2' received
        digitalWrite(led2, HIGH); // turn LED2 ON
        Serial.println("LED 2 ON");
        break;
      case '3': // if a '3' received, cycle LEDs
        Serial.println("Cycle LEDs");
        for (int i = 1; i <= 4; i++) { // cycle each LED ON/OFF 4 times
          digitalWrite(led1, HIGH);
          delay(80);
          digitalWrite(led1, LOW);
          delay(80);
          digitalWrite(led2, HIGH);
          delay(80);
          digitalWrite(led2, LOW);
          delay(80);
        }
        break;
      case '4': // if a '4' received, turn BOTH LEDs ON
        Serial.println("BOTH ON");
         digitalWrite(led1, HIGH);
         digitalWrite(led2, HIGH);
        
        break;
      case '0': // if a '0' received, turn BOTH LEDs OFF
        digitalWrite(led1, LOW);
        digitalWrite(led2, LOW);
        Serial.println("LEDs OFF");
        break;
      default:  // disregard all other data sent from Serial Monitor
        break;
    }
  }
  bt1Val = digitalRead(btn1); // get the current state of the button pin
  if (millis() - lastBt1 > btThresh) { // if it's been at least 100 milliseconds since
                                       //last button pin check
                                       // filters out multiple button pin reads
                                       // (like debouncing)
    if (bt1Val == HIGH) { //  if button is pressed
      Serial.println("clicked!");
      lastBt1 = millis(); // reset lastBt1 to the current time to be ready
      //for next click
    }
  }
  Serial.print(bt1Val);
  Serial.print("\t"); // ‘\t’ is a TAB feed. Spaces out values across the line
  Serial.print("Last button clicked time:");
  Serial.print("\t");
  Serial.println(lastBt1);
  delay(150); // slow down sketch for easier viewing on screen
}