/*
 Controlling a servo position using a potentiometer (variable resistor)
 by Michal Rinott <http://people.interaction-ivrea.it/m.rinott>

 modified on 8 Nov 2013
 by Scott Fitzgerald
 http://www.arduino.cc/en/Tutorial/Knob
*/

#include <Servo.h> //include library/info

Servo myservo;  // create servo object to control a servo

const int pushButton = 2; // button wired up to D2
int pushState = 0; // variable for if the button is HIGH or LOW
int mode = 0; // variable for what to do after each "button click"
int potpin = 0;  // analog pin used to connect the potentiometer
int val;    // variable to read the value from the analog pin
int pos = 0; //position variable for sweep

void setup() {
  Serial.begin(9600); //serial moniter
  Serial.println("helloworld"); //test
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
  pinMode(pushButton, INPUT_PULLUP); //button kept at HIGH by internal resitor
}

void loop() {
  pushState = digitalRead(pushButton); //state of the button (HIGH or LOW) is known when you "read" the push button
  if (pushState == LOW){ //add 1 to the value of "mode" each time button is pressed, value determines what is going on after the click
    mode++;
    if (mode > 3){ //only 3 modes, go back to one/cycle back
      mode = 1;
    }
    Serial.println(mode); //let user know what mode they are in/testing
    delay(150); //need time, otherwise one press will add too much to the mode value for one click
  }

  if (mode == 1){ //knob 
    val = analogRead(potpin);            // reads the value of the potentiometer (value between 0 and 1023)
    val = map(val, 0, 1023, 900, 2160);     // scale it to use it with the servo (value between 0 and 180)
    myservo.write(val);                  // sets the servo position according to the scaled value
    //delay(15);                           // waits for the servo to get there
  }

  if (mode == 3){ //sweep
    for (pos = 0; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees // in steps of 1 degree
      myservo.write(pos);
      Serial.println(pos);
      delay(15);
      
    }
    for (pos = 180; pos >= 0; pos -= 1) { //opposite
      myservo.write(pos);
      Serial.println(pos);
      delay(15);
    }
  }

  if (mode == 2){ //set
    myservo.write(1530);
    delay(15);
  }
}