Week 8 - 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, I implemented servo rotation and RGB LED color changes (red, green, blue) based on numbers (1-3) sent via Bluetooth from a phone GUI. Inspired by smart pet feeders and Arduino projects, this improves wireless control and automation for my final project.

Tool Chain

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

Electronics

Arduino UNO

Jumper Wires

Servo motor

Bluetooth Module HC-05

RGB LED

300 ohm Resistor

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?

Wiring on TinkerCad (same wiring on real life ) adjust pins locations as the connections section below ;)

Bluetooth Module Connection

Input Actions :

Bluetooth Signal (from phone GUI: '1', '2', or '3')

Output Actions :

Servo Motor (rotates based on input)
RGB LED (changes color: red for '1', green for '2', blue for '3')

Connections

servo motor

signal --> pin 9

power --> 5V arduino

gnd --> gnd

RGB LED

resistor on each leg except for the cathode

green --> pin 3

blue --> pin 5

red --> pin 6

Bluetooth Module ( i followed the pic above for the resistors wiring )

vcc --> 5V

gnd --> gnd

txd --> Rx pin 0

rxd --> Tx pin 1

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?

Wiring on Breadboard

IMG_4285.HEIC

IMG_4283.HEIC

Arduino Code

Brief Explanation of Code :

1. Setup Phase

- Initializes Bluetooth communication at 9600 baud

- Attaches the servo motor to pin 9

- Sets RGB LED pins (red, green, blue) as outputs.

- Positions the servo at 0° and turns off the LED initially.

2. Main Loop (loop())

- Checks if there is an incoming Bluetooth command.

- Reads and prints the command for debugging.

- Based on the received command (`'1'`, `'2'`, or `'3'`):

- Moves the servo to 90°, waits for 1 second, then resets to 0°

- Changes the RGB LED color:

- `'1'` → Red

- `'2'` → Green

- `'3'` → Blue

3. Functions Used

- moveServo(): Moves the servo to 90° and back to 0°

- setRGB(red, green, blue): Adjusts the RGB LED colors

Purpose

This setup allows Bluetooth-based control of a pet feeder or similar device, with LED feedback for different commands.

Final Outcome Video

IMG_4282.MOV

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?

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 got stuck, I searched about Bluetooth connection for the resistor wiring since I wasn’t sure how they were connected.

the pic i used is mentioned 🔝

Final Project

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?

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.

Assignment Design Files

week 8 code .ino

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