Marcelino Yax

Teensy 4.0: Flight Data Logger

Thu, 24 Sep 2026 00:30:00 -0400

Introduction

The Teensy 4.0 microcontroller is a low-cost, high-performance, and compact board. Carbon Aeronautics took advantage of these capabilities and adapted both its open-source code and PCB frame to use the Teensy 4.0 as the flight controller for a quadcopter. The board provides high processing power through its 600 MHz processor, along with the necessary peripherals and pins to connect the onboard sensors and devices (e.g., IMU, barometer, and ESCs). The flight controller can control the quadcopter at a loop rate of 250 Hz, demonstrating how capable this small board can be.

Quadcopter: Motor Mixer Algorithm

Mon, 22 Jun 2026 17:03:00 -0400

Introduction

With a personal goal of developing a deep understanding of quadcopter dynamics, I built my own quadcopter based on the open-source Carbon Aeronautics drone. This required purchasing parts online, making modifications, and assembling the whole quadcopter from the ground up until flight testing. Even though it may sound like a straightforward path from assembly to testing, I spent months stuck trying to make it fly due to both hardware and software issues. Little by little, the fun turned into frustration.

Mon, 01 Jan 0001 00:00:00 +0000

I am an electrical engineer and Software developer with a passion for integrating hardware and software to create cutting-edege products. Currently employed as a Drone QC Engineer at Easy Aerial, I leverage my expertise to ensure the quality of unmanned aerial vehicles (UAV). Previously, I honed my skills as an Android developer contributing to the development of apps for startup companies.

My other interests include running, swimming and reading many books.

Compose UI

Mon, 01 Jan 0001 00:00:00 +0000

App Overview

I implemented this beatiful custom Android Control-Player UI following Material Design 3 (MD3) guidelines and utilizing Jetpack Compose UI, styles, colors, components and patterns.

Note: The actual UI designs are available at the MD3 website.

Android Concepts

Compose UI, Column, Row, MD3 Components (Slider, Text, IconButton, Image), Preview, Scaffold, Theme, Custom Compose Component

Design & Implementation

Player Control

Custome UI

Mon, 01 Jan 0001 00:00:00 +0000

App Overview

I meticulously crafted these beatiful and customizable Android UIs following Material Design 3 (MD3) guidelines and utilizing Android themes, styles, colors, components and patterns.

Note: The actual UI designs are available at the MD3 website.

Android Concepts

Bottom Navigation View, FAB, Extended FAB, ConstraintLayout,Navigation, ViewModel, Data Binding and more.

Design & Implementation

Plant Care	Plant Info

Messenger	Player

Demoxus

Mon, 01 Jan 0001 00:00:00 +0000

App Overview

Demoxus is a personalized and interactive Android application for touch screen kiosks that allows users to take poll, trivias, and play games. I developed this app with the team at GrupoInnoxus company.

Android Concepts

Timer, Fragment, Custom Keyboard, Testing(mockito, robolectric), and more.

Check Demo Video

Expense Tracker

Mon, 01 Jan 0001 00:00:00 +0000

App Overview

ExpenseTracker helps user to monitor budget and expenses.

Android Concepts

Kotlin, ViewModel, Coroutine, Room Persistence, LiveData, MediatorLiveData

Github

Design & Implementation

Main	Statement

Budget	Adding Expense

Lunits

Mon, 01 Jan 0001 00:00:00 +0000

App Overview

Lunits is a social networking app that allows users to share advertisements that disappear after a period of time. “It’s like Snapchat for ads” . I developed this app for the startup Lunits.

Android Concepts

Tested my knowledge in Android to the extreme: I worked with a combination of many Android concepts.

Design & Implementation

Login	Main

Profile	Ad Request

Mchat

Mon, 01 Jan 0001 00:00:00 +0000

App Overview

mChat is a simple chat app that allows any user to chat with other users. I used firebase for the backend; firebase enables me to store and sync my Android app’s data in real-time.

Android Concepts

RecyclerView, Authentication, Structuring database schema, Firebase Offline, Real-time communication between many users.

Github

Design & Implementation

Login	Register

Users	Chat

One Way

Mon, 01 Jan 0001 00:00:00 +0000

App Overview

One Way is a simple game app that lets the users memorize and redraw a given path. I wrote the app, designed the interface and logo, and published it.

Android Concepts

Custom View, Fragment Lifecycle, onTouchEvent, Frame-by-Frame Animation, Threads, SurfaceView, SurfaceHolder, Paint and Canvas, Menus

Design & Implementation

Instruction	Animation

Score	Menu

Projects

Mon, 01 Jan 0001 00:00:00 +0000

Custome UI - Material Design (MD)

MD UI		Compose UI

Client Apps I’ve worked with

Demoxus	Lunits

My Personal Apps

Vocabulary	ExpenseTracker

One Way	Tit Tac Toe

Stormy	mChat

Resume

Mon, 01 Jan 0001 00:00:00 +0000

EDUCATION

The City College of New York, NY, USA
B.E in Electrical Engineering, 2013

CERTIFICATIONS

New York University Certificate in Android App Development, 2014

SKILLS

Development Tools: Android Studio, IntelliJ, Visual Studio Code
Programing Language: Kotlin, Java, HTML, CSS, Javascript
Version Control System: Git
Machine Shop Tools: Soldering irons, CNC Mills, Drill Press

APPLICATIONS

WORK EXPERIENCE

Drone QC Engineer
Easy Aerial
June 2022 - Present

Stormy

Mon, 01 Jan 0001 00:00:00 +0000

App Overview

Stormy is a weather app from my online Android course at Treehouse. For this app I added custom hourly weather forecast graphs using MPAndroidChart chart library, and designed my own logo and background. I also learned to download and parse data from the Internet.

Android Concepts

Custom ImageViews, Intents and Multiple Activities, Model-View-Controller(MVC), Networking, Third-Party API, JSON, Asynchronous Processing, Error Handling, ListViews, Parcelable Data, RecyclerViews, ViewPager, Custom Adapter and Plotting Data

Tic Tact Toe

Mon, 01 Jan 0001 00:00:00 +0000

App Overview

Tic-Tac-Toe is a single screen app that plays the tic-tac-toe game against the user.

Android Concepts

SharedPreferences, Handler, Menus, UI Layouts, UI Controls, AlertDialog

Github

Design & Implementation

Instruction	Main

Playing	Message

Vocabulary

Mon, 01 Jan 0001 00:00:00 +0000

App Overview

Vocabulary helps users to save and share vocabulary words.

Android Concepts

Kotlin, ViewModel, Coroutine, Room Persistence, LiveData

Github

Design & Implementation

Vocabulary List	Vocabulary Editing