Programs 

Material Kits 

Writing components on fritzing. 

1- I downloaded fritzing app. 

2- I used the breadboard, Arduino, breadboard, buzzer and downloaded the other components like Bluetooth, servo motor then imports them to be able to use them.

2- I connected the Buzzer pin to pin 7.

Servo pins: -

Pin 9, GND - GND

Positive - 5 v 

3- I connected the pins of Arduino to the Bluetooth sensor as: - 

Ground - GND breadboard 

Vcc - 5v on breadboard

Tx - Rx

Rx - Tx

The servo is connected to pin 9. When button 1 is pressed on the phone, the servo motor moves and the door opens. Pressing button 2 activates the buzzer to warn people that something is wrong, while pressing button 3 turns the buzzer off. 

The servo motor opens/closes the door.

The buzzer signals alerts.

The Bluetooth module lets you control the system wirelessly with a phone

The Bluetooth module receives commands (like "1" for open, "2" for alarm, "3" for stop).

 Arduino reads the command and executes an action:

     If command = 1: Servo rotates to open the door.

     If command = 4 : Servo rotates to close the door. 

     If command = 2: Buzzer turns ON (warning/alarm).

     If command = 3: Buzzer turns OFF.

The servo returns to its initial position to close the door after a delay.

Writing the code 

Open new sketch then choose → Examples → servo → sweep. 

Preset up 

1- Copy the pre void set up and define the buzzer to pin 7 & Servo pin 9 & int command

2- Make a place to store commands from Bluetooth/Serial.

Void Setup 

1- Start Serial Communication: - Serial. begin (9600);

we use it to send numbers like 1, 2, 3, 4 to control the servo and buzzer.

2- Attach the servo to pin 9.                        myservo.attach(9);

3- Prepare buzzer pin 7 as output.            pinMode(buzzerPin, OUTPUT);

4- Set servo = 0 means closed, buzzer = low means off.      

 myservo.write(0);

digitalWrite(buzzerPin, LOW);

Void Loop 

1- Download if condition and copy it in the code and edit as following 

2- If yes, it will read it. 

if (Serial.available() > 0) {

command = Serial.parseInt(); 

3- If the command is 1 → Open the door 

The servo moves to 90°, which means the door is open. 

4- If the command is 4 → Close the door 

The servo moves back to 0°, which means the door is closed.

5- If the command is 2 → Turn buzzer ON 

The buzzer starts making sound.

6- If the command is 3 → Turn buzzer OFF 

The buzzer stops making sound. 

Real Wiring

I did the same with real jumpers 

1- Buzzer pin to pin 7.

2- Servo pins: -

Pin 9, GND - GND

Positive - 5 v 

3- Bluetooth sensor as: - 

Ground - GND breadboard 

Vcc - 5v on breadboard

Tx - Rx

Rx - Tx

4- Open the Bluetooth app on the phone, connect it with MD 35 (Bluetooth) connect from inside the app again and start checking by pressing 1 to open the servo, 4 to close it.

4 buzzer on as alarm and 3 to be off. 

My instructor and colleagues guided me in identifying what needed to be edited in the code, and their support was truly helpful. They also advised me to check the actual connections, and one of my colleagues even shared her phone so I could connect to the Bluetooth, as my iPhone did not support that type of connection. 

Gaining more experience in coding and connecting sensors and buzzers with Arduino has strengthened my skills. I also learned to restart the Arduino and sensor when I get stuck and to verify the accuracy of the wiring using Avometer. 

All of this will make completing the final project much easier.

This week assignment is useful because my final solution involves connecting a fan to a temperature sensor to reduce high temperature and I might use multiple fans to improve heat reduction.