#include <Arduino.h>
#include <Servo.h>



/*Nakul Verma student # 12345
Midterm prep Exercise 2*/

Servo turny;

//setup a bool for exercises 2 and 3
bool check = LOW;

void setup() {
//declare all the pushbutton inputs
pinMode(2,INPUT);
pinMode(12,INPUT);
pinMode(8,INPUT);
pinMode(7,INPUT);

//declare all the LED output circuits
pinMode(5,OUTPUT);
pinMode(6,OUTPUT);
pinMode(9,OUTPUT);
pinMode(10,OUTPUT);

//designate pin 11 as the servo PWM pin
turny.attach(11);
  
}

void loop() {
//start by turning off all the LEDs
//LED circuits are active-low and will turn of with logic HIGH
digitalWrite(5,HIGH);
digitalWrite(6,HIGH);
digitalWrite(9,HIGH);
digitalWrite(10,HIGH);

//Exercise 1 blink all the LEDs while button A is pressed
while(digitalRead(2) == HIGH)
  {
    //turn on all the LEDs
    digitalWrite(5,LOW);
    digitalWrite(6,LOW);
    digitalWrite(9,LOW);
    digitalWrite(10,LOW);

    //keep the LEDs on for 150 ms
    delay(150);

    //turn off all the LEDs for 180 ms
    digitalWrite(5,HIGH);
    digitalWrite(6,HIGH);
    digitalWrite(9,HIGH);
    digitalWrite(10,HIGH);
    
    //keep the LEDs off for 180 ms
    delay(180);
  }

  //Exercises 2 and 3: turn on all the LEDs with button B

  //set the check boolean to logic high if button B is pressed
  if (digitalRead(12) == HIGH)
  {
    check = HIGH;
  }

  //set the check boolean to logic low if button C is pressed
  if (digitalRead(8) == HIGH)
  {
    check = LOW;
  }

  //toggle the LEDs on/off based on whether the boolean is logic high/low, respectively
  if(check==HIGH)
  {
    //turn on all the LEDs
    digitalWrite(5,LOW);
    digitalWrite(6,LOW);
    digitalWrite(9,LOW);
    digitalWrite(10,LOW);
  }

  if(check==LOW)
  {
    //turn off all the LEDs
    digitalWrite(5,HIGH);
    digitalWrite(6,HIGH);
    digitalWrite(9,HIGH);
    digitalWrite(10,HIGH);
  }

//exercise 4; move the servo back and forth between 45° and 135° while button D is pressed
while(digitalRead(7)){
  turny.write(45);
  delay(300);
  turny.write(135);
  delay(300);
}
}