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)

I wanted to do something related to my final project to test myself and see the time I'll take .

My final project is a smart home so I decided to make a smart door ; opens in 2 different modes controlling them with a slide switch , the first mode : the door opens when I write a correct password and the second mode when I'm at a distance lower than 10 cm from the door.

Tool Chain

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

Slide switch

Arduino Uno and it's cable

Ultrasonic sensor

One buzzer

Some male-female and male-male wires

Breadboard

Avometer

A box from cardboard

Arduino APP.

Servo motor

3*4 Keypad

Sewing thread

I need cardboard to be the enclosure and to make a door to be opened, I need Arduino Uno to be the microcontroller of the project and it's cable to connect it to the PC,I need Arduino App to write the code of the project, A keypad is necessary to write the password, buzzer to show that if I need to write another password or not ,I need also Ultrasonic sensor to detect the distance ,A servo to open the door with the help of sewing thread, I need a slide switch to make me move from one mode to the other . I needed also a breadboard to help me to connect my wires. And finally, Avometer to check my wiring.

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?

Design in TinkerCAD website

I used the search tab to collect my tools then I started connecting them : the ultrasonic needs a power and ground also needs two output I used pins 11and12,Then I connected the servo with input pin 10.I didn't find 3*4 keypad in tinkercad so I used keypad 4*4 but I didn't connect column(4) pin the other pins were connected from (2-8)pins in the Arduino .I used also the slide switch and connected it to pin 13. Finally I put the buzzer and connected one pin of it to an analog pin(9) to have different sounds. , and the other pin was put to the ground.

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 connecting the wires in Tinkercad I moved to Arduino App to write the code , I started writing a code to operate the servo using the ultrasonic only.

I used servo examples from the App to help me see how to write the code of servo and what libraries I may need . I took 3 lines : #include <Servo.h> , Servo myservo and myservo.attach().

Then I attached it to pin 10 and made the servo set its position to zero degree .

I moved to the Ultrasonic code I searched for it first and found that it will need to send some waves , get them back and calculate the distance from the time it needed to come back. So , I attached the trigger as output in pin 11 and echo as input in pin 12 .Then I made trigger LOW then HIGH then LOW to send waves and took it in the echo pin using pulsIn function.

Finally , I made the condition that the distance is lower than 10 cm the servo will move 180 degrees else it will be the same. I used print serial to help me catch errors if any.

Ultrasonic with servo code

The final Arduino code for ultrasonic and Keypad

I then moved to the keypad code and wrote it in a different file ,This week tutorial helped me to write its code.

First, I downloaded the library then made a two dimensional array to store the rows and columns and used input pins from 2 until 8.I used the function getKey to get the number which I press and store them in variables : digit1,2,3,4 and enter.

I used a count variable to be a flag so that I can know I have entered 4 digits and pressed enter. After I have entered what I need I will check first for the enter key using switch case ; if False I will make a sound in the buzzer and won't change the servo , if True I will check for the digits . Once I found the digits True I'll open the door and make a worm sound with the buzzer. If not I won't open it .

Finally , I have made a new digital input pin (13) for the mode switch and made a condition for it ; if it read HIGH I'll put the whole Keypad code inside , else I'll put the whole ultrasonic code( from the last file ) to be implemented.

final shape.mp4

Overcoming Challenges

What kinds of challenges or problems did you face while doing the assignment, tutorials, or exercises? How did you solve them? Did you ask for help from an instructor or peer? Please provide a link to the tutorial or article that you used to solve your problem (if any)

I didn't know how to make the servo open or close the door , I searched to know and found people using something like iron wires so I decided to use sewing thread :)

Link I found and helped me to control the door

Final Project

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

This week I have learned how to download libraries to Arduino App and how to get examples to know what functions I'll use.

Also, I learned how to deal with Keypad as it's the first time for me to use.

Finally, I have learned how to merge two modes in one code using the slide switch.

WOW!

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

Saeed surprised us and came to fab-lab Mansoura ♥

Assignment Design Files

MY DESIGN LINK IN TINKERCAD

ARDUINO CODE[.INO]

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