Kholoud`s Project Journal

Project Ideation

1- Tell us about the idea of your project. Why do you care about this? What were you inspired by? Include images and videos of similar projects

Home is everything for me. Whenever I say the word "home" It means being safe.

One day, my friend`s house was broken into and robbed. They didn`t know but when they came home so many days later and it was so scary for them. None of the neighbors noticed that at all and it was a great shock.

So, I decides to make a device to tell me if anybody is trying to enter my house while I am outside but, in a smart way .

Similar Project 1

Similar Project 2

Project Construction

2- Explain the CAD process of your project. How did you use the software to design your project? (List the softwares/tools/materials...etc that you used)

I used Fusion 360 for designing.

Didn`t want the design to be complicated.

After searching the internet and Thingivers, I decided to make a very simple 3 D printed box (Part 1).

While for the magnet holder(Part 2), the bracket was a great inspiration. It is simple and functional as well.

Fusion 360 Logo

Thinkgiverse Logo

The main box (Part 1):

First draw a rectangle (135mm x 75mm ). Make another one inside( 2 mm away from each side ) to make margins. Extrude (2 mm). Extrude the margins only above (50 mm ) and here is a box.

From each side, we have to design places for the screws and nuts.

Add a new sketch. draw 4 rectangles from each side. Extrude to the bottom so it will be suitable for printing (small extrusion will be weak).Draw a rectangles from each side for putting the nuts inside. Extrude cut the rectangles (8x8 mm ). from above make another sketch. Draw a circle (3.5 mm in diameter) from each side and extrude cut.

Add the screws and nuts by making joints. Joint the Arduino and Extrude cut the 4 holes of its screws).

Now, we have to make the cover. Make a new sketch. Draw a rectangle (135 x 75 mm). Extrude 2 mm.

Add the buzzer. Extrude cut (2mm).Don`t forgot that the LED is in a holder(7.8 mm) so, draw a circle 7.8 mm in diameter and extrude cut(2mm).To fix the cover with the box extrude cut the 4 circles for he screws as well. Make fillet 2 mm. for all the box and cover.

For the bracket

Draw L shape (60mm x 30mm). Extrude 15 mm. Make fillet 2mm for better appearance. In one side make a hole for the screw. Draw a circle 3.3 mm. Extrude cut. In the other side make a hole for the magnet (10.5 mm ''change it according to the magnet you have''). Extrude cut 32 mm.

CLICK IN HERE FOR F3D FILE for magnet holder.

CLICK IN HERE FOR F3D FILE for the main box and the cover.

Save the files in .STL files to be ready for printing. Open it in Cura app. Press slice and send it to the USB.

3- Explain the fabrication process of your project. How did you use the machine to fabricate your project? (List the softwares/tools/materials...etc that you used)

Add the chosen PLA .(blue PLA)

Connect the USB to the printer.

For using the bedding sensor. Add G 51 in preference. Choose the STL file. Press O.K.

STL file for magnet holder

STL file for the main box

STL file for the cover

VID-20250305-WA0014.mp4

Project Electronics & Power Management

4- Describe your electronic circuit. What are the input and action components? What is the function of each? How do the components integrate together to form your smart system? (List the softwares/tools/components...etc that you used)

For the Input

1- When the door is opened, the two magnets will be away. The magnetic field sensor will detect it (input 1).

2- When the RF read card 1 or 2 it will stop any action.(input 2)

An Arduino as a brain

which reads a signal from the (Magnetic field sensor and the RF).

For the output (Action)

I used the LED, buzzer, bread board and wires

to illuminate the LED and make a sound.(output 1).

I didn`t find magnetic field sensor or RF in Tinker-CAD so, I downloaded them in Fritzing.

video_2025-02-21_20-29-03.mp4

And making "No action" when detecting card 1 or 2 (output 2).

video_2025-03-09_22-28-37.mp4

Let`s do them together:

The Arduino UNO Connection

The 5 Volts with a positive N in the bread-board

The ground with the negative N in the bread-board

The Sensor Connections

The Magnetic Field Sensor:

VCC to the positive on the bread-board

Out to A0

Ground to negative N in bread-board

The RF

SDA (brown wire) on pin 10 on Arduino-UNO

SCK (yellow wire) on pin 13 on Arduino-UNO

MOSI (green wire) on pin 11 on Arduino-UNO

MISOI(violet wire) on pin 12 on Arduino-UNO

Ground (blue wire) on pin GND negative N on Arduino-UNO

RST (grey wire) on pin9 on Arduino-UNO

3.3V (red wire)on positive pin on bread-board to 3.3 Volts on Arduino-UNO

LED

The positive leg to pin 2 on Arduino (red wire)

The negative leg to resistor to the negative N on bread-board to the ground of Arduino-UNO(blue wire)

Buzzer

The positive leg to pin 3 on Arduino-UNO (red wire)

The negative leg to the negative N on bread-board to the ground of Arduino-UNO(blue wire)

5- What is your power source? How did you select the suitable power source for your project? (List the softwares/tools/components...etc that you used)

-5V Adapter

-As the Arduino and buzzer need 5V D.C.

-While the LED need less than 5 Volts, so I will add a 220 Ohm resistor to decrease the voltage.

For the sensors :

-Magnetic field sensor use 5 Volts from the Arduino.

-R.F. needs only 3.3 Volts from the Arduino itself.

I thought of using a battery but nowadays we can allow a socket to turn on a machine even during electricity cutting off.

So, no need to use batteries.

Project Programming

6- Describe the code of your project. How did you program each function of the project?

Define:

To define :

magnetic sensor Write #include <SPI.h>
RF Write #include <MFRC522.h>

Then write the pins that will be connected to Arduino.

The voltage downward is for defining the electric voltage that is always accompanied to the magnetic fields so it`s a way to define magnetic field.

Void:

In void, we informed the code that we have:

Specific magnetic field else we are going to make an action.
familiar cards for the RF, else The Led pin and buzzer pin will be the out put.

Void Loop:

We inform the buzzer if the magnet is close turn off the buzzer and LED.

Else:

Turn on them , but if the RF detected any one of the cards turn off them.

Divide and conquer, this is how I worked with the code.

First, I started with testing the Magnetic sensor.

I used it and the magnet to test it`s functionality.

From library I downloaded the following codes:

Testing the north and south poles and testing high or low magnetic field.

Then, I made another code for the RF sensor and the two cards.

Finally, Add the parts above together in one code,

the void in both of them together and void loop in both together as well.

Final code of cards authentication and magnetic field together.

*click on every underlined word for the link of the file

1-After saving the file of Arduino App The file in Arduino app.

2- Connect the Arduino to the lab-top using the USB cable.

3- Be sure you chose the right USB of Arduino and press upload.

video_2025-03-09_22-28-37.mp4

Project Integration & Testing

7- Demonstrate with text and visuals how did you integrate the project’s modules together? What are the testing results? (Include a Demo video separately, showing a proof of functionality)

I was so excited to add the circuits and wires inside the box.

First I added the LED with its holder and the buzzer.

Then fixing the Arduino in the main box with screws and nuts.

reconnect the separated wires again.

Add the RF to the cover and fixing it with screws and nuts.

Test the device and add the cover.

Finally Call the family's members to enjoy testing it together.

video_2025-03-10_22-50-53.mp4

Sharing & Collaboration

8- 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?

Yes, in every step I was asking.

I wanted it to be a good project.

Marwa helped me recommending a store for magnets.

Israa bought me another magnet.

We were supporting each other all the time AL7.They were great companions.

Overcoming Challenges

9- 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 project?

I was asking every one about the colors all the time.

yes, this me😅

The code was a little bit confusing but divide and conquer strategy really helped a lot.

At this point I searched a lot, There were so many useless codes in the internet .Mohanad told me about a Maker who used RF sensor before (Thanks Menna-Allah Mahmoud) and it really worked al7.

Keep your magnet in a visible box all the time. It keeps attracting to every metal around.
It wasn`t clear where to put the magnets to be in front of the magnets` sensor so, I opened the device again, put a mark outside the box to be able to know where to fix the magnets exactly.

Future Work

10- If you had more time, what is one thing you would change/ Do next in your project?

If I have more time, I will add siren to the device so the voice will be louder(110DPA-12Volt).

Final Project Design Files

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