Maria Rodriguez
DIY electrical educator and NEC code compliance expert.
Published work
Showing the latest 60 — browse the full index in the sitemap.
Components & PrototypingDesigning Schematic Circuit Diagrams: NPN Switch Walkthrough
Design schematic circuit diagrams with a practical NPN switch walkthrough, featuring node analysis, real component values, and extreme failure modes.
Switches & OutletsVoltage Drop Calculations for Safe Wiring and Electrical Installation
Master voltage drop math for wiring and electrical installation. Learn wire sizing, NEC guidelines, and real-world calculations to prevent equipment failure.
Projects & AutomationAdvanced Tutorials for Raspberry Pi: Building an I2C BME280 MQTT Environmental Monitor
A practical, code-complete tutorial for Raspberry Pi 5: wire a BME280 sensor via I2C and publish temperature, humidity, and pressure to an MQTT broker.
Projects & AutomationArduino Programming Basics: A Decision-Forward Guide to Your First Reliable Build
Master Arduino programming basics with this decision-forward guide. Includes exact board picks, pin mappings, error debugging, and compilable code.
Components & PrototypingUnderstanding Electromagnetism and Magnetism: Core Selection and Flyback Protection
Learn how electromagnetism and magnetism dictate inductor saturation and relay flyback. Includes core material decision trees and numeric saturation math.
Components & PrototypingTrigonometry Simple Definition for AC Circuit Analysis and Power Factor
A practical trigonometry simple definition for electrical work, covering AC phase angles, impedance triangles, and power factor correction with real calculations.
Components & PrototypingEssential Trigo Formulas for AC Impedance and Power Factor Calculations
Master essential trigo formulas for AC circuit analysis. Includes impedance triangles, power factor derivations, symbol tables, and worked examples.
Components & PrototypingBoolean Algebra in Circuits: Truth Tables, Logic Gates, and PLC Design
Master boolean algebra in electronics with practical truth tables, 5V CMOS logic gate examples, and PLC circuit applications for real-world hardware design.
Components & PrototypingUnderstanding the 5 Binary Number (0101) in Digital Logic and Microcontrollers
Learn how the 5 binary number (0101) maps to physical GPIO voltages, with real-world port manipulation examples and shift register debugging.
Components & PrototypingChoosing the Right PCB CAD Tools: From Breadboard to First Spin
Master your PCB CAD tools workflow. Learn IPC trace width sizing, avoid breadboard-to-PCB migration mistakes, and safely test your first spin board.
Components & PrototypingUnderstanding Electricity Hertz: How AC Frequency Impacts Motors and Circuits
What is electricity hertz? Learn how AC frequency (50Hz vs 60Hz) affects motor speeds, cycle times, and global power compatibility with real-world examples.
Projects & AutomationCurrent Source Robot Design: Sourcing vs Sinking I/O Explained
Learn how current sourcing and sinking work in microcontroller I/O, with a real-world numeric example for open-source robot sensor arrays.
Projects & AutomationMicrobots Reales: Engineering Functional Sub-Gram Robotics with Embedded MCUs
Explore microbots reales by engineering sub-10g robotics. Learn power budgeting, MCU selection, and MEMS integration for functional micro-robotics.
Projects & AutomationChoosing the Right ESP32 Device: Power, Variants, and Circuit Rules
A decision-forward guide to the ESP32 device family. Learn power domain math, PCB layout rules, and exactly which variant to pick for your 2026 build.
Components & PrototypingWhat Is BESS Energy Storage? Sizing, Components, and Grid Integration
Understand what BESS energy storage is, how it alters circuit fault profiles, and how to size a battery energy storage system with our worked numeric example and decision matrix.
Components & PrototypingHow to Use a Scientific Calculator for RC Time Constant and Capacitor Decay Formulas
Master the RC time constant and capacitor decay formulas using a scientific calculator. Includes symbol tables, unit tracking, and worked examples.
Components & PrototypingUnderstanding Flux in Magnetic Field: Core Sizing and Saturation Limits
Learn how magnetic flux dictates transformer sizing and inductor saturation. Includes worked calculations, core material selection, and SMPS design tips.
Components & PrototypingBoolean Algebra in Circuit Design: Logic Gates, Truth Tables, and PLC Applications
Learn how Boolean algebra translates to physical logic gates, PLC ladder logic, and microcontroller circuits with real-world numeric examples and truth tables.
Components & PrototypingBeginning Electronics: Sizing Current-Limiting Resistors for LEDs
Master beginning electronics by learning how to calculate, size, and pick the exact current-limiting resistor for any LED and power supply.
Components & PrototypingUnderstanding Binary Code 0: ESP32 Logic LOW Debugging and Active-Low Circuit Design
Master binary code 0 (Logic LOW) in embedded circuits. Learn ESP32 GPIO active-low debugging, pull-down resistor sizing, and floating pin fixes.
Projects & AutomationHow to Wire and Calibrate a tofsensor (VL53L1X) for ESP32 Projects
Learn how to wire, calibrate, and code a tofsensor (VL53L1X) with an ESP32. Includes I2C pinouts, raw-to-mm math, and interference troubleshooting.
Switches & OutletsStandard Wire Color Coding for Electrical Wiring: NEC Guide & Chart
Master wire color coding for electrical with our NEC guide. Learn AC/DC differences, 3-phase charts, and multi-wire branch circuit safety rules.
Tools & Electronics GuidesSizing a Backyard Powerplant: Solar Array and 48V Battery Math
Design a residential powerplant solar system. Learn 48V LiFePO4 sizing math, C-rate limits, series vs parallel wiring, and inverter selection.
Switches & OutletsHow to Wire an Outlet Plug: 15A and 20A Receptacle Installation Guide
Learn how to wire an outlet plug safely with our step-by-step guide. Covers 14/2 and 12/2 NM-B wire colors, terminal screws, and multimeter testing.
Projects & AutomationHC-SR04 Sensor Arduino: Wiring, Code, and Debugging Guide
Wire, code, and debug the HC-SR04 ultrasonic sensor on Arduino. Includes pinouts, timeout error handling, and fixes for 0 cm reading failures.
Projects & AutomationRaspberry Pi Simple Projects: Build an I2C BME280 Environmental Logger
Master Raspberry Pi simple projects by building a BME280 I2C environmental logger. Includes exact wiring, Python code, and hardware debugging steps.
Components & PrototypingPower Factor in AC Circuit Design: Building an RL-Parallel-C Correction Topology
Learn to design, build, and breadboard-test an RL-parallel-C topology to measure and correct power factor in AC circuit applications with real components.
Components & PrototypingMQTT Definition Explained: Architecture, ESP32 Wiring, and IoT Broker Setup
A practical MQTT definition for makers: protocol mechanics, ESP32 sensor wiring, PubSubClient code, broker debugging, and IoT network comparisons.
Components & PrototypingThe Diode Component Guide: Selection, Biasing, and Testing for Practical Circuits
A practical guide to the diode component: selecting default part numbers, biasing for specific jobs, testing with a multimeter, and common failure modes.
Projects & AutomationESP32-CAM Module Explained: Power Limits, PSRAM, and Sensor Selection
Master the ESP32-CAM module with our deep dive into DVP bus limits, AMS1117 power budgets, and a decision tree for choosing the right OV2640 or S3 variant.
Components & PrototypingElectrical Frequency in the USA: 60Hz Standards and Equipment Tolerance
Understand the electrical frequency in the USA (60Hz), how it affects imported motors, transformer vs converter needs, and NEC wire color codes.
Components & PrototypingPractical Zener Diode Circuit Design: Selection, Biasing, and Testing Guide
Master zener diode circuit design with our 2026 guide. Learn biasing, voltage regulation math, failure testing with a multimeter, and default part numbers.
Components & PrototypingSolving Series Parallel Circuits: Node Analysis, Failure Modes, and Design
Master solving series parallel circuits with real-world node analysis, failure mode tables, and a 12V breadboard design walkthrough.
Components & PrototypingVoltage Regulation Definition: How to Calculate and Fix Power Supply Droop
Master the voltage regulation definition, calculate load regulation with real numbers, and learn how poor regulation causes microcontroller brownouts.
Components & PrototypingScientific Method Calculator Guide: Error Propagation Formula for Electronics Labs
Master the scientific method calculator approach for electronics. Learn the error propagation formula, solve circuit uncertainty problems, and track units.
Components & PrototypingSeries and Parallel Circuits Explained: Topology, Failure Modes, and 12V Design
Series and parallel circuits explained through node topology, failure mode contrasts, and a real 12V LED array design walkthrough with breadboard testing.
Components & PrototypingElectric Magnetics in Circuit Design: Inductance, Flux, and Practical Applications
Master electric magnetics for circuit design. Explore core materials, inductive reactance calculations, and real-world applications like SMPS and EMI filtering.
Components & PrototypingUnderstanding Copper Resistance: Voltage Drop, AWG Sizing, and Real-World Circuit Impacts
Learn how copper resistance affects voltage drop and heat in real circuits. Includes AWG sizing calculations, practical examples, and common wiring mistakes.
Components & PrototypingAdding Resistors in Parallel and Series: A Practical Design Guide
Master adding resistors in parallel and series to hit custom values, manage wattage, and design fail-safe networks with real component math.
Components & PrototypingCalculating the Binary Number of States for ADC Resolution and Digital Inputs
Learn how to calculate the binary number of states for ADC bit-depth and digital inputs, with real ESP32/Arduino examples and a part-selection decision tree.
Components & PrototypingChoosing Simple PCB Design Software: A Breadboard-to-Board Migration Guide
Transition from breadboard to custom PCB. Compare simple PCB design software, calculate trace widths, and learn first-spin testing and soldering safety.
Components & PrototypingWhat is a PLC in Electrical Engineering? Architecture, Sizing, and Real-World Failures
Understand the role of a PLC in electrical engineering. Learn I/O sizing, scan cycles, and how to avoid common 24VDC output failures in control panels.
Components & PrototypingWhat Is USA Power Voltage? Nominal Standards, Tolerances, and Equipment Rules
Learn what USA power voltage is, including ANSI C84.1 tolerances, NEC vs IEC color codes, and how to safely adapt imported 220V equipment.
Switches & OutletsUnderstanding the Colour Coding of Wires for Home AC Circuits
Master the colour coding of wires for US and UK AC mains. Learn NEC/IEC standards, MWBC neutral calculations, and how to avoid dangerous miswiring.
Components & PrototypingMastering the Voltage Divider Example: Step-by-Step Math and Loading Traps
Walk through a practical voltage divider example with full algebraic steps, E24 resistor data tables, and how to avoid the hidden loading effect trap.
Projects & AutomationMastering Raspberry Pi Interfaces: I2C, SPI, and UART Sensor Hub Build & Debug Guide
Build a multi-protocol sensor hub using Raspberry Pi interfaces (I2C, SPI). Includes exact pinouts, Python code, and debugging for bus errors.
Components & PrototypingVoltage in the United States: Standards, Tolerances, and Compatibility
A technical reference for voltage in the United States, covering ANSI nominal levels, NEC conductor colors, and equipment compatibility rules.
Components & PrototypingUnderstanding the Transfer Function Butterworth Filter for Circuit Design
Learn how the transfer function of a Butterworth filter creates a maximally flat passband. Includes Sallen-Key numeric examples, comparisons, and FAQs.
Projects & AutomationHow to Program Arduino Boards: Uno R4 Minima Setup, Code, and Debugging
Learn how to program Arduino boards using the Uno R4 Minima. Includes exact pinouts, compilable C++ code with I2C error handling, and a hardware debugging guide.
Projects & AutomationTop Ambient Monitoring Ideas with Raspberry Pi 5: Build a Multi-Sensor Hub
Explore practical ideas with Raspberry Pi 5 by building an I2C ambient sensor hub. Includes pinouts, Python code, and I2C debugging steps.
Switches & OutletsElectrical Wiring Codes Explained: Box Fill, Sizing, and AFCI Rules
Master electrical wiring codes with practical box fill math, NEC wire sizing rules, and a decision tree for AFCI/GFCI breaker selection in your home.
Components & PrototypingThe Core Electricity Principle Law Framework: Ohm, Kirchhoff, and Watt Explained
Master the fundamental electricity principle law framework. Learn how Ohm's, Watt's, and Kirchhoff's laws dictate real-world circuit design with worked examples.
Projects & AutomationMonitoring Arduino Sites with an ESP32: Web Scraper Project & Debugging
Build an ESP32 dashboard to monitor popular Arduino sites. Includes complete code, I2C OLED wiring, and debugging guides for 403 HTTP errors.
Projects & AutomationArduino SBC Showdown: Microcontroller vs Single Board Computer Selection Guide
Confused by the term Arduino SBC? We break down microcontrollers vs single board computers with a decision tree, IoT code, and debugging guide.
Components & PrototypingWhat Is Two's Complement in Binary? A Hardware-Focused Guide
Understand what two's complement is in binary with real numeric examples, ALU hardware impacts, and a bench scenario debugging a signed sensor reading.
Components & PrototypingDecoding the Silver Tolerance Resistor: Color Codes, Types, and Substitution Rules
Understand what a silver tolerance resistor band means (±10%), identify the underlying component type, read the color code, and safely substitute parts on the bench.
Components & PrototypingThe Ultimate Schematics Symbols Chart: IEEE 315 vs. IEC 60617 Standards
Master schematics symbols chart comparing US IEEE 315 and international IEC 60617 standards. Includes graphical modifiers and reference designators.
Components & PrototypingUnderstanding AND Logic Gates in Digital Circuit Design
Master AND logic gates with real-world circuit examples, 74HC08 voltage thresholds, noise margins, and practical safety interlock designs.
Tools & Electronics GuidesTransparent Solar News Reality Check: Sizing Batteries and Inverters for Glass PV
We analyze the latest transparent solar news to size a real 24V LiFePO4 battery bank, MPPT controller, and inverter for low-yield glass photovoltaics.
Projects & AutomationWhat Are Ground Fault Interrupters for DIY ESP32 AC Projects?
Learn what ground fault interrupters are, why they protect DIY AC-powered ESP32 and Raspberry Pi projects, and how to test them safely.