Week 7# - Journal

#include <Servo.h>

Servo servo;  

int potpin = A1;          

const int SERVO_PIN = 3;  

const int trig_pin = 9;

const int echo_pin = 10;

int led = 7;

int Control = 8;

const int DISTANCE_THRESHOLD = 20; 

float duration_us, distance_cm;

void setup() {

  servo.attach(SERVO_PIN);  

  servo.write(0);          

  pinMode(led, OUTPUT);

  pinMode(echo_pin, INPUT);

  pinMode(trig_pin, OUTPUT);

  pinMode(Control, INPUT_PULLUP); 

  digitalWrite(trig_pin, LOW);

  Serial.begin(9600); //  

  Serial.println("System Started...");

}

void loop() {

  int controlState = digitalRead(Control);

  Serial.print("Control Button State: ");

  Serial.println(controlState);

  if (controlState == LOW) {

    Serial.println("Manual Mode (Potentiometer Control)");

    int val = analogRead(potpin);

    Serial.print("Potentiometer Value: ");

    Serial.println(val);

    val = map(val, 0, 1023, 0, 180);

    Serial.print("Mapped Servo Angle: ");

    Serial.println(val);

    servo.write(val);

    delay(15);

  } else {

    Serial.println("Auto Mode (Ultrasonic Sensor)");

    digitalWrite(trig_pin, HIGH);

    delayMicroseconds(10);

    digitalWrite(trig_pin, LOW);

    duration_us = pulseIn(echo_pin, HIGH);

    distance_cm = 0.017 * duration_us;

    Serial.print("Measured Distance: ");

    Serial.print(distance_cm);

    Serial.println(" cm");

    if (distance_cm > 0 && distance_cm < DISTANCE_THRESHOLD) {

      Serial.println("Object Detected - Activating Servo & LED");

      servo.write(180);  

      digitalWrite(led, HIGH);  

      delay(3000);

    } else {

      Serial.println("No Object Detected - Resetting Servo & LED");

      servo.write(25);  

      digitalWrite(led, LOW);  

    }

  }

  delay(200);

}