Week 7 - Journal

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)

This week assignement was to make projet who has 2 input and 2 output so , I searched something useful for my desk, and I found an automatique box to put my things and then lock them.

Tool Chain

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

TinkerCad

Arduino IDE

Arduino Uno

Arduino Uno cable

servo motor

BreadBoard

Glue Gun

Jumpers

Cardboard

Cutter

9V DC adaptor

4X3 Keypad

LCD I2C

IR Sensor

LEDS

Resistor

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?

I started to make circuit on Tinkercad, I'm using 2 components as input and 4 components as Output.

Input:

Keypad 4X4: to enter the password so that my box open.
IR sensor: to sense the presence of someone near the box.

Output:

LCD I2C screen : to display messages.
Servo motor: to open and close the box itself.
2LEDS (RED and Green) = to tell us is the password is wrong or not.

So before making my physical circuit, I used Tinkercad how the LCD screen work. So First I started to display a simple message "hello world" and after this I started to make my circuit .

Also, the keypad the keypad in Tinkercad is 4X4 and the one that we have in our kit is 4X3, so I had to search how to code this in arduino IDE.

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?

Explanationation of the code

First, I started to download the libraries of keypad and lcd then started the program with <Keypad.h> and <LiquidCrystal_I2C.h> without forgetting <Servo.h> because of servo motor that I going to use. after finishing this I started to define my components and pinmode . I use the wors "ROWS" and "COLS" to tell arduino that my keypad has 4 ligne and 3 colognes and their Pins. after this, I made a password "4321" and another variable called "inputCode" to stock the code that I will put on physically.

So, in the void setup (), define the nature of my pins if its Leds) or input (IR sensor), then I made the angle of my servo 0 degree , then initialised my lcd so that the first message should be "System Read" with a delay of 1.5 sec and then clear.

In the loop I used an if condition so that " If Ir sensor sense a precense , the lcd display a message telling welcome and enter the password, if the password is correct my servo motor does 60-degree angle and the green Led become High but to validate the password you must click # " . Else the servo stay 0 degree and the Red Led become with a message telling "Wrong Code".

This part is when the IR sensor doesn't sense any presence it , the LCD display a message telling me that there is nobody around. and if I touch "*" the lcd display a message "Retry again"

Circuit

WhatsApp Vidéo 2025-09-03 à 13.59.43_7f47bac5.mp4

Demo

I started to connect the 7 pins of my keypad to (Pin 2 to Pin 8) of the Arduino after this i wired my servo and ir sensor to pin 9 and 10 and the leds (green and red) and finally the lcd screen. Then I uploaded my code to Arduino.

With Carboard

WhatsApp Vidéo 2025-09-03 à 13.58.53_53e2c495.mp4

After uploading my code and tested that everything is ok, I started the fabrication of the cardboard. As you can see in the video, I entered the password and my box open automatically and the green led turned high to prove that the password is correct. If the password is incorrect the red led turn high .

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?

when i attached the stick to servo motor then turn wrongly and when i put my hand near IR sensor the sensor wasn't working.

I figured out that the servo motor rotate on the other side towards the back and broke the link between it and the Sticks , so i changed the rotate of the servo motor manually and it worked

Title of Media

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

WOW!

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

I was an amazing week , we entered deep in electronics. The EOW session we made a