Generic Tasks Report

11 / 9 / 2025

---

Marvel Tasks Report

Level 0
Date: 12/09/2025

The following tasks were assigned under Marvel Level 1. These tasks helped me explore multiple technical domains and gain hands on experience. My learnings and implementations are explained below.

---

Task 1: Working with GitHub

In this task, I worked with GitHub to understand how Issues, Pull Requests, and GitHub Actions work together in a project. The goal was to fix an error in the main branch of the given repository and submit a Pull Request with the correction.
Through this task, I learned: How to fork a repository and create my own copy, cloning the repository to my local system and made changes in the new branch, identified the bug in the code and I resolved it, next commit and push the changes to Github by creating a Pull Request that I've fixed the bug in the code.

Screenshots:

---

Task 2: Get Familiar with the Command Line on Ubuntu

In this task, I explored the basic usage of the command line in Ubuntu, I practiced different commands such as mkdir, cd, touch, ls, echo, cat etc...

Steps I Performed

• Created a folder named test and moved inside it.
• Created a blank file using touch.
• Listed the contents of the folder using ls.
• Created 2600 folders with unique names using the mkdir command.
• Made two text files (file1.txt and file2.txt) with random text and concatenated them into a new file concat.txt.
• Displayed the combined result on the terminal.

Screenshots :

1. 
2. 

---

Task 3: Karnaugh Maps and Deriving the Logic Circuit

In this task, I learned how to use Karnaugh Maps (K-Maps) to simplify Boolean expressions and design a simple burglar alarm circuit.
The burglar alarm should work based on the whether the door is locked or open, whether the key is pressed or not pressed. By using these conditions on a 4-variable K-Map, I identified the simplified Boolean expression for the output. This logic was then used to design a circuit using logic gates.

Image:

---

Task 4: Tinkercad

In this task, I learned how to use Tinkercad to simulate Arduino circuits virtually. I created a simple circuit with Arduino UNO where an Ultrasonic Sensor was connected along with I2C LCD Display. The purpose of the circuit was to measure the distance between the sensor and an obstacle, and then display the result on the LCD screen. The working principle was simple: the ultrasonic sensor sends a trigger pulse, and the time taken for the echo to return is measured. Using the formula
Distance (cm) = (Time × Speed of Sound) / 2,
the distance is calculated is displayed on the LCD, and I have used a code by referring sites .

Screenshot :

---

Task 5: Sad Servers – Command Line Murders

In this task, I worked on a Linux troubleshooting challenge called Sad Servers. The scenario was a “Command Line Murder Mystery,” where I had to investigate a crime using only Linux commands. I changing given directories and files, then searched for the first clues using the grep command. The crimescene file revealed initial hints that guided to murderer. By checking the people, streets, and interviews files, I located witness named Annabel, then revealedvehicles file using filters to filter cars that matched the description of a “Blue Honda” with a specific license plate. Once I found the matching car, I looked for its owner. The final step was to confirm the suspect through multiple membership files, which pointed to the criminal named Jeremy Bowers, which solved the case challenge.

Screenshots:

---

Task 6: Writing Resource Article using Markdown

In this task, I explored Markdown as a simple way to format technical articles. I wrote an article on the topic “Process vs. Thread: OS Concepts Simplified”, where I explained the differences between processes and threads with examples, a comparison table, and short Python demos. Markdown made it easy to add headings, tables, code blocks, and images without using HTML. This helped me understand how Markdown can be used for technical documentation and publishing resources online.

You can read the full article here:
Process vs. Thread: OS Concepts Simplified

---

Task 7: Portfolio Webpage Report

For this task, I built a responsive portfolio website using React and Bootstrap. The site showcases my profile, interests, projects, and social links with a clean design. A dynamic gradient background changes with user interaction.

Portfolio Link: harsha-portfolio-taupe.vercel.app

---

Task 8: API Report

For this task, I built a simple web app called Scanalyze using the VirusTotal API.
The app can scan both URLs and files to check if they contain any malicious content. App Link: Scanalyze
Referred site for VirusTotal Python API Docs: vt-py Quickstart

---

Task 9: LED Toggle Using ESP32

For this task, I worked with the ESP32 microcontroller and learned how to create a web server to control an LED through its GPIO pins. I Installed and configured Arduino IDE with ESP32 board support. Connected the ESP32 board and verified communication with the IDE. Wrote and uploaded a program that created a simple web server. Served an HTML page with ON/OFF buttons. Accessed the ESP32’s IP address via a browser. Controlled an LED connected to ESP32 GPIO pins based on user input.

---

Task 10: Datasheets Report Writing

For this task, I studied the MQ-135 Gas Sensor and prepared a detailed report covering its working principle, pin configuration, gas calibrations, and the Freundlich Adsorption Isotherm graph. The report also explains its applications, advantages, and limitations in air quality monitoring and IoT-based systems.

Full Report: MQ-135 Gas Sensor Task Report

---

Task 11: Active Participation

I actively participated in the GeeksforGeeks Bengaluru Workshop Series under the Nation SkillUp initiative. The workshops topic MERN development. During the sessions, I gained practical experience in designing and deploying applications. Alongside learning, I actively engaged in activities and won a quiz competition, earning a GfG T-shirt as a reward.
I also received a certificate of participation for successfully attending the workshop.
Certificate:
T-shirt Reward:

---

Task 12: 3D Printing

For this task, I learned about the working of a 3D printer theory and its main components such as the extruder, filament, print bed, and controller board. I understood how the process works in three stages – designing (STL file), slicing (using software like Ultimaker Cura or Creality Slicer), and printing where material is added layer by layer. I also studied the different types of 3D printing technologies like FDM, SLA, and SLS, along with the materials used in each.

---

Task 13: Build Your Own Brain - Linear Regression from Scratch

In this task, I implemented Linear Regression manually using Gradient Descent and compared it with the Scikit-learn implementation. The goal was to predict house values based on median income using the California Housing dataset.

• Manual Gradient Descent: Started with random slope and intercept, updated them step by step to reduce error.
• Scikit-learn: Used built-in LinearRegression which gives results instantly using matrix algebra.
• Comparison: Both models gave similar best-fit lines, but sklearn was faster and more optimized.
  I plotted the real data, my manual regression line (red), and sklearn’s regression line (green dashed).

---

Task 14: The Matrix Puzzle — Decode with NumPy & Reveal the Image

In this task, I decoded a scrambled matrix to reveal a hidden image using NumPy and Matplotlib.

• First reshaped the scrambled 1D array into a square matrix.
• Then transposed and flipped it to fix the orientation.
• Finally, visualized the corrected image with matplotlib.
  This helped me practice reshaping, slicing, transposing, and flipping arrays with NumPy.
  

---

Task 15: Speed Control of DC Motor

In this task, I explored how to control the speed of a DC motor using an Arduino UNO and the L298N Motor Driver (H-Bridge). The key idea was that the motor’s speed depends on the applied voltage, and by using PWM (Pulse Width Modulation) from Arduino, I could smoothly vary the average voltage and thus control the speed.

I first simulated the setup in Tinkercad and then tested it on hardware with a 5V BO motor. The L298N module was used to manage both direction (IN1/IN2 pins) and speed (ENA pin connected to Arduino’s PWM). A simple Arduino sketch was written to gradually increase and decrease the motor speed, demonstrating smooth acceleration and deceleration.

This activity helped me understand the working of PWM in speed control, motor driver interfacing, and the importance of an external power supply for better torque.

Project Image:

Conclusion

Completing Level 0 tasks gave me practical exposure to different domains, improved helped me become comfortable with tools of different domains.