#include <Servo.h>

Servo myservo;                      // create servo object to control a servo
int servoPin = 9;

int button_01 = 2;
int button_02 = 3;
int button_03 = 13;

int i = 0;
int servoAngles[10] = {10, 90, 30, 120, 60, 150, 90, 180, 100, 20};  // initialize array of servo angles

bool state_1 = 0;
bool state_2 = 0;
bool state_3 = 0;

void setup() {
  myservo.attach(servoPin);
  
  pinMode(button_01, INPUT);      // set the mode for the buttons as INPUT
  pinMode(button_02, INPUT);
  pinMode(button_03, INPUT);

  Serial.begin(9600);
}

void loop() {
  // code for button 1
  if (digitalRead(button_01) == HIGH && state_1 == 0) {   // check if button 1 is pressed and not already processed
    state_1 = 1;                                          // set state to 1 to indicate button press is processed
    delay(50);                                            // add a short delay to prevent multiple executions
    
    if (i < 9) {
      i++;                                               // increment index in array
    } else {
      i = 0;                                             // reset index to 0 if it reaches the end of the array
    }
    
    Serial.print("Selected angle: ");
    Serial.println(servoAngles[i]);
    delay(500);                                           // add a delay to prevent multiple executions
    
    // set state back to 0 to indicate processing is completed
  }
  
  if (digitalRead(button_01) == LOW){
    state_1 = 0;
  }
  
  // code for button 2
  if (digitalRead(button_02) == HIGH && state_2 == 0) {   // check if button 2 is pressed and not already processed
    state_2 = 1;                                          // set state to 1 to indicate button press is processed
    delay(50);                                            // add a short delay to prevent multiple executions
    
    if (i > 0) {
      i--;                                               // decrement index in array
    } else {
      i = 9;                                             // set index to the end of the array if it reaches 0
    }
    
    Serial.print("Selected angle: ");
    Serial.println(servoAngles[i]);
    delay(500);                                           // add a delay to prevent multiple executions
    
    // set state back to 0 to indicate processing is completed
  }
  
  if (digitalRead(button_02) == LOW){
    state_2 = 0;
  }
  
  // code for button 3
  if (digitalRead(button_03) == HIGH && state_3 == 0) {   // check if button 3 is pressed and not already processed
    state_3 = 1;                                          // set state to 1 to indicate button press is processed
    
    Serial.print("Set angle: ");
    myservo.write(servoAngles[i]);                        // write the selected angle to the servo
    Serial.println(servoAngles[i]);
    delay(500);                                           // add a delay to prevent multiple executions
    
    // set state back to 0 to indicate processing is completed
  }
  
  if (digitalRead(button_03) == LOW){
    state_3 = 0;
  }
}