Week #8 - Journal

Cool Traffic light =D

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 had a course in robotics a year ago and my first task was making a traffic light signal, so I wanted to make it advanced with RGB led, I searched for similar projects: traffic light signal with RGB LED
To fulfill this week requirement I added LCD to show traffic sign words in addition to the RGB led and controlled them from Android app using Bluetooth module.

Tool Chain

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

software:

Arduino IDE

I used Arduino to burn the code to arduino uno to start the trial physically

Tinker CAD

I used tinker cad to test and simulate the circuit before prototyping it physically to protect the electronics from burning or any problem

electronics:

Arduino UNO + USB cable

Bluetooth Module HC-05

LCD I2C

RGB LED common cathode

Small breadboard

Male to male jumper wires

Male to female jumper wires

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?

Using Arduino UNO I connected:
1- Bluetooth Module HC-05 ( INPUT ):
VCC to +
GND to -
TX to RX in arduino
RX to TX in arduino
2- LCD I2C ( OUTPUT ):
VCC to +
GND to -
SDA to A4
SCL to A5
3- RGB LED ( OUTPUT ):
long leg ( common cathode ) to -
left leg "RED" to pin 9
mid leg "GREEN" to pin 10
right leg "BLUE" to pin 11

Ardino Bluetooth Control App

Using this Graphical user interface I controlled the traffic signal using buttons as first button sends r as sign of red to stop, second button sends y as sign of yellow to wait, and last button sends g as sign of green to GoOoOo.

To use this app u have to finish the wiring physically and open bluetooth on the phone and connect to HC-05 then enter the password : 1234 or 0000

After that connect again in the application to HC-05 to start using the app

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?

I followed the wiring diagram I made on fritzing to do my wiring physically on the actual breadboard and Arduino UNO.

defining input in global scope
including LCD libraries and defining it.

Starting serial monitor.
setting rgb led pins as output.
starting LCD.

if there is something sent via bluetooth print and store it in input
if input is r
turn the RGB to red and print " STOP " on LCD

if input is y
turn the RGB to yellow and print "WAIT" on LCD

if input is g
turn the RGB to green and print "EGRYYYY" on lcd

I should've added lcd.clear();
to clear the LCD

WhatsApp Video 2022-09-15 at 00.39.12.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)

WhatsApp Video 2022-09-15 at 00.38.11.mp4

I had a problem with LCD that it sometimes showed only the first letter of each line, after many trials and asking my instructor Sherif we reached to inclusion that we overcome this problem by uploading the code to arduino over and over again till the LCD shows all the letters.

Another problem was uploading the code to the arduino though tx and rx wasn't wired. I removed every wire to the arduino and closed any other arduino ide window opened then tried again and it was uploaded successfully.
I sometimes need to restart my Laptop then try again.

Final Project

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

I want to make my final project communicate wirelessly using processing

Assignment Design Files

Traffic signal with Bluetooth.ino

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