Maryam Dabous

Ideation

Tell us about your assignment's idea for this week. Why do you care about this idea? What inspired you? (Please include images or links to sources of inspiration)

Security alarm.

in this week we're gonna build a smart device for our desk or backpack.

i selected to make a smart security device for bag

inspo: Backpack Anti-Theft Alarm : 11 Steps (with Pictures) - Instructables

Tool Chain

Which software/machines/materials did you use in the assignment? Why?

Arduino uno

tinkercad

ultrasonic sensor

push button

LED + 220-ohm Resistor

buzzer

arduino uno

jomper wires

breadboard

Design/Preparation Process

Explain the design and/or preparation process of your assignment. How did you use the tool or software to design and/or prepare your assignment before fabrication/implementation?

Inputs

Ultrasonic Sensor (HC-SR04): Detects distance to objects near the bag.
Push Button: Used to switch the security system ON or OFF.

Outputs

Buzzer: Produces an alarm sound when someone is too close to the bag.
LED: Provides a visual warning when the alarm is triggered.

How it Works

The project is a Smart Bag Security System.

When someone approaches the bag:
- The Ultrasonic Sensor measures the distance to detect if an object (a hand or someone’s movement) comes closer than 15 cm.
- If the system is ON (controlled by the push button), it activates the security check.

circuit on tinkercad

10-53-49.mp4

first, i start wiring using tinker cad:

Wiring Connections

Ultrasonic Sensor (HC-SR04)

VCC → 5V (Arduino UNO)
GND → GND (Arduino UNO)
Trig → Pin
Echo → Pin 10

Buzzer

Positive terminal (+) → Pin 6
Negative terminal (–) → GND

LED (with 220Ω Resistor)

Long leg (Anode +) → 220Ω Resistor → Pin 7
Short leg (Cathode –) → GND

Push Button

Pin 1 → Pin 8
Pin 2 → GND
(Using INPUT_PULLUP in the code, so no external resistor is required)

code

for coding:

code logic for alarm behavior:

The code turns the bag security system ON or OFF using a push button. When the system is ON, the ultrasonic sensor measures the distance. If someone comes closer than 15 cm, the buzzer and LED turn ON as an alarm. Otherwise, they stay OFF. If the system is OFF, both the buzzer and LED remain OFF.

Development/Implementation Process

Explain the development/implementation process of your assignment. How did you use the machine/tool to manufacture or implement the design of your assignment?

After confirming that the components worked as expected in the simulation, I connected the actual components on a breadboard with the Arduino UNO. The ultrasonic sensor, push button, buzzer, and LED were all wired according to the design.

معلش بس هي الاسلاك ملعبكة حبتين

On Arduino:

first i start the code with defining the pins on my Arduino for every component.

definition

After that, at the set up i wrote the mode of each pin (which is output and which is input)

Setup

At the loop (runs continuously):

Read the state of the push button to check whether the system should be ON or OFF.
Measure the distance from the ultrasonic sensor by sending and receiving signals.
Store this measured distance in a variable so it can be compared later.
Print the distance values on the Serial Monitor for debugging and observation.

loop

If Condition

Inside the loop, I used if conditions to control the behavior of the outputs:

First, the program checks whether the system is ON.

If the system is ON, then it checks the distance value.

If the distance is less than 15 cm, the buzzer and LED are activated (alarm mode).

If the distance is greater than or equal to 15 cm, the buzzer and LED are kept OFF.

If the system is OFF (regardless of distance), the buzzer and LED remain OFF.

if condition

for the prototype:

I first cut the cardboard to sheets to be a cube shape and i make holes to place the components.

Final Project

How can you use the skills and knowledge that you've acquired this week in your final project?

welcome زنان

WhatsApp Video 2025-09-12 at 10.48.29_9ad6e3d6.mp4

demo video

Community of Learning

Did you ask for feedback? What are the ideas that others have contributed or suggested? What was someone else’s idea that you built upon? How did you help your peers? How did your peers help you?

rewatching this week الاف المرات عشن قمة في الاهمية

Overcoming Challenges

When you got stuck, what/who did you turn to? At what point did you have to pause to research or learn more before moving on? What are some mistakes, pitfalls, or challenges that others can avoid if they were doing this assignment?

i struggled with the code with writing it (bugs everywhere) with ; and {}

and at first of the code i forget to definr the pins

Debuging

BUG

WOW!

What is the coolest thing that you've learned this week? What is something that you will never forget from this week?

Title of Media

Weekly Digest [OPTIONAL]

Tell us about any other cool things that you've made this week: in the Hands-on activity, tutorial examples, exercises, or any other cool mini-project that you tried out aside from the assignment.