Sarah Mitchell
Electronics engineer specializing in Arduino and microcontroller projects.
Published work
Showing the latest 60 — browse the full index in the sitemap.
Components & PrototypingWhat the Automation Industry Actually Does: A Bench-Level Control Breakdown
Discover what the automation industry actually builds at the circuit level, from 4-20mA sensor loops to PLC logic and VFD motor control.
Components & PrototypingElectrical Work vs Power: Joules, kWh, and Real Circuit Calculations
Learn the difference between electrical work and power. Includes formulas, real-world kWh calculations, and battery sizing examples for DIY solar.
Components & PrototypingWhat Is the Bitwise AND Operator in Embedded C and Hardware Registers?
Learn what the bitwise AND operator is, how it differs from logical AND, and how to use it to safely manipulate GPIO registers in embedded C.
Projects & AutomationServo Motor Controls: Sizing, Wiring, and ESP32 Integration
Master servo motor controls for ESP32 projects. Learn load sizing, PCA9685 wiring, torque calculations, and how to fix jitter, stall, and overheat failures.
Projects & AutomationEdge AI Microcontroller Selection: Silicon Specs, Power, and Inference Math
Compare top edge AI microcontrollers with real specs, power budgets, and inference math to choose the right silicon for embedded vision and audio projects.
Components & PrototypingWhat Is a Logic Gate: Voltage Thresholds and Real-World ICs
Learn what a logic gate is, how voltage thresholds define binary states, and how to use 74-series ICs for real-world hardware decision-making.
Components & PrototypingSchematics Design Fundamentals: Translating Logical Nodes to Physical Circuits
Learn schematics design fundamentals with real-world numeric examples, I2C pull-up calculations, and relay driver failure analysis for PCB layouts.
Components & PrototypingWhat is C in Hex? Decoding 0x0C in Firmware and Circuit Registers
Learn exactly what C means in hexadecimal, how 0x0C alters GPIO registers and I2C addresses, and how to avoid ASCII confusion in embedded firmware.
Components & PrototypingHow Is a Magnetic Field Produced? Electron Spin to Solenoid Coils
Learn exactly how a magnetic field is produced by moving charge and quantum spin, with bench math, real-world relay failures, and circuit design rules.
Components & PrototypingWhat Is Electrotechnical Engineering? The Bridge Between Circuit Theory and Safety Standards
Discover what electrotechnical engineering is, how it dictates PCB creepage, clearance, and safety certifications, and how to pick compliant parts.
Components & PrototypingWhat Is LoRa Technology? A Practical Guide for IoT Makers
Learn what LoRa technology is, how Chirp Spread Spectrum works, and how to wire and code SX1276 modules for long-range, low-power IoT projects.
Components & PrototypingUsing a Transistor as a Switch: A Practical Bench Guide
Learn the practical basics of using a transistor as a switch. Includes biasing math, safe default part numbers, and a real-world failure scenario.
Projects & AutomationHow to Select and Wire High-Torque Servo Motors with Arduino
A decision-forward guide to selecting, sizing, and wiring servo motors with Arduino. Includes torque calculations, PCA9685 driver setup, and failure troubleshooting.
Projects & AutomationProgramming the Raspberry Pi 5 for I2C Sensor and Relay Control
Learn programming the Raspberry Pi 5 for I2C sensor and relay control. Includes Python code, pinouts, and debugging for BME280 and GPIO errors.
Projects & AutomationWhich Motor Driver Module for Arduino Fits Your Load Profile?
Learn how to size and wire a motor driver module for Arduino. Compare DC, stepper, and servo drivers with real load examples and troubleshooting tips.
Projects & AutomationSafely Powering ESP32 Mains Projects: Ground Fault Interrupter (GFI) Requirements
Learn how to safely integrate ground fault interrupter (GFI) protection into mains-powered ESP32 and Arduino projects to prevent lethal shocks and fried boards.
Components & PrototypingAn Easy Definition of Electricity: Volts, Amps, and Watts Explained for Makers
Looking for an easy definition of electricity? We break down volts, amps, and watts with real-world maker examples, wire sizing math, and practical circuit rules.
Projects & AutomationArduino Code Tutorial: Build a PI-Controlled PWM Cooling Fan
Master this Arduino code tutorial to build a PI-controlled PWM fan. Includes exact pinouts, R4 Minima code, and I2C debugging steps.
Components & PrototypingMastering the Impedance Spectrum for Signal Integrity and Noise Control
Learn how to read an impedance spectrum to identify noise coupling paths, apply cost-effective signal integrity fixes, and verify results with TDR.
Components & PrototypingWhat Is a Hex Value in Microcontrollers and Digital Logic?
Learn what a hex value is, how base-16 maps to binary registers, and how to avoid common decimal vs hexadecimal bugs in ESP32 and Arduino I2C setups.
Components & PrototypingOp Amp Meaning Explained: Pinouts, Biasing, and IC Selection Guide
Understand the practical op amp meaning, pinouts, and operation regions. Learn how to bias, test with a multimeter, and pick the right default IC.
Components & PrototypingMastering AC Phasors: When to Use an Advanced Online Calculator for Voltage Drop
Learn the AC voltage drop formula, track units through solved problems, and see why an advanced online calculator prevents motor startup failures.
Components & PrototypingHow to Use an E6 Calculator for Micro and Mega Unit Conversions
Master the E6 calculator workflow for electronics. Learn the 10^6 and 10^-6 engineering notation shortcuts for capacitive reactance with worked examples.
Components & PrototypingUnderstanding Ohm's Law of Resistance: Formulas, Examples, and Real-World Wiring
Master Ohm's law of resistance with real-world circuit examples, wiring applications, and a practical FAQ to solve everyday electrical problems.
Components & PrototypingHow Is Electricity Generated, Transmitted, and Stepped Down for Your Workbench?
Learn how electricity is generated, transmitted across the grid, and stepped down to 120V/240V for DIY projects, complete with transformer sizing math and real-world failure analysis.
Tools & Electronics GuidesHow a Wireless Charger for Electric Vehicles Transfers Power: SAE J2954 Circuit Theory
Learn how a wireless charger for electric vehicles uses resonant inductive coupling, SAE J2954 power classes, and 85 kHz frequencies to transfer up to 11 kW.
Components & PrototypingHow to Read Schematics Diagrams: Logic, Math, and Part Selection
Master schematics diagrams with practical bench advice, a worked ESP32 numeric example, and a decision tree for selecting physical components.
Switches & OutletsUnderstanding Cables and Wiring: Differences, Sizing, and Installation Rules
Learn the exact difference between cables and wiring, complete with ampacity tables, NEC conduit fill rules, and real-world cost comparisons for home projects.
Components & PrototypingUnderstanding Resistance in Electrical Circuits: Theory, Formulas, and Real-World Impact
Master resistance in electrical circuits with plain-English theory, real-world numeric calculations, material comparisons, and critical safety FAQs.
Projects & AutomationBuild a Raspberry Pi KVM Over IP: DIY Wiring, Code, and Debugging
Build a Raspberry Pi KVM over IP using a Pi 4, HDMI-CSI bridge, and USB OTG. Includes Python HID injection code, wiring tables, and debugging steps.
Projects & AutomationRaspberry Pi Pico 2 W I2C Sensor Wiring & Debugging Guide
Wire, code, and debug a BME280 sensor on the Raspberry Pi Pico 2 W over I2C. Includes exact pinouts, MicroPython error handling, and fix paths.
Projects & AutomationHow to Use the Raspberry Pi 5 for I2C Sensor Logging: MCP9808 Guide
Learn how to use the Raspberry Pi 5 for I2C sensor logging with an MCP9808. Includes exact wiring, pinouts, Python code, and I2C debugging.
Switches & OutletsThe Complete Diameter of Wire Chart: AWG, Metric, and NEC Ampacity
Reference the complete diameter of wire chart for AWG and metric conversions. Includes NEC ampacity, derating factors, and quick-jump lookups.
Projects & AutomationArduino ESP32 Setup: Debugging Upload Errors & Wi-Fi Sensor Node
Master Arduino ESP32 setup. Fix the 'Failed to connect' upload error, map I2C pins, and build a Wi-Fi sensor node with complete, robust code.
Components & PrototypingDecoding the Blue Resistor Color Code: Values, Bands, and FAQs
Master the blue resistor color code with our complete reference chart. Learn to read 4, 5, and 6-band blue resistors and avoid common misreadings.
Projects & AutomationArduino for Beginners Tutorial: Build a BME280 I2C Weather Station
Master I2C communication with this Arduino for beginners tutorial. Wire a BME280 sensor and LCD, complete with code, pinouts, and debugging steps.
Components & PrototypingThe SI Unit for Electrical Current: Understanding the Ampere in Practice
Master the SI unit for electrical current (the ampere). Learn how current dictates wire sizing, heat dissipation, and real-world circuit design.
Components & PrototypingThe Practical Op Amp Definition: Selection, Biasing, and Bench Troubleshooting
A bench-tested op amp definition covering pinouts, biasing, safe default part numbers, and a real-world troubleshooting scenario for makers.
Components & PrototypingHow Is the Magnetic Field Generated in Copper Coils and Inductors?
Learn how the magnetic field is generated in copper coils, with bench math, core saturation traps, and a real-world AC solenoid failure analysis.
Components & PrototypingElectricity Parallel Circuit Design: Real Values, Rules, and FAQs
Master electricity parallel circuit design with real component values, failure mode analysis, breadboard testing steps, and common FAQs.
Components & PrototypingEssential Capacitor Rules for Circuit Design and Safe Substitution
Master the essential capacitor rules for type selection, decoding physical markings, diagnosing failures, and safely substituting parts at the bench.
Components & PrototypingDesigning a Closed Series Circuit: Topology, Failure Modes, and Node Analysis
Master the closed series circuit with real-world node analysis, failure mode extremes, and a step-by-step breadboard testing protocol.
Switches & OutletsLight Switch with Outlet Wiring: Step-by-Step Combo Device Guide
Master light switch with outlet wiring using a combo device. Includes decision tree, exact terminal colors, and the #1 fin-breaking mistake to avoid.
Components & PrototypingWhat is HVDC: High Voltage Direct Current Theory and Grid Applications
Learn what HVDC is, how it eliminates reactive power losses over long distances, and when to specify VSC versus LCC converter topologies.
Components & PrototypingHow to Use an Electricity kWh Calculator: Formula, Examples, and Battery Sizing
Master the electricity kWh calculator formula. See worked examples with unit tracking, avoid common mistakes, and size your battery bank.
Components & PrototypingElectricity Symbol Reference Chart: Decoding IEC and NEMA Schematics
Master reference chart for electricity symbols. Compare IEC 60617 vs NEMA Y32.2 standards, avoid common schematic traps, and safely trace faded panels.
Projects & AutomationBest Raspberry Pi for Camera Projects: Board Selection and Setup Guide
Choose the right Raspberry Pi for camera projects. Includes a decision matrix, Pi 5 and Camera Module 3 wiring, Python code, and debugging steps.
Projects & AutomationRaspberry Pi Camera V3 Setup, Pinout, and libcamera Debugging Guide
Wire up the Raspberry Pi Camera Module V3, map the MIPI CSI-2 pins, and debug common libcamera and MMAL errors with exact fixes and Python code.
Projects & AutomationMastering I2C Addressing: Bus Mechanics, Pull-Ups, and Debugging Clashes
A bench-tested guide to I2C addressing, covering 7-bit address maps, pull-up resistor calculations, bus clash fixes, and ESP32 debugging code.
Components & PrototypingA Practical Electrical Engineering Overview for Makers and DIY Builders
A bench-and-jobsite electrical engineering overview covering core pillars, real-world circuit math, and the boundary between engineering and electrical work.
Projects & AutomationChoosing the Right Arduino Servo Motor Controller for High-Torque Loads
Compare hobby, closed-loop stepper, and BLDC servos. Learn Arduino servo motor controller sizing, wiring, and failure diagnostics for high-torque builds.
Components & PrototypingHow to Define an Ampere: Practical Wire and Breaker Sizing Guide
Learn how to define an ampere in practical circuits. Includes worked math examples, wire sizing tables, and breaker selection for AC mains and DC loads.
Components & PrototypingUnderstanding AND Gate Electronics: IC Pinouts and Logic Thresholds
Master AND gate electronics with real IC pinouts, CMOS vs TTL logic thresholds, and a bench-tested scenario showing how to avoid floating input failures.
Switches & OutletsAll Types of Switches: A Decision Guide for AC, DC, and Motor Loads
A decision-forward guide to all types of switches. Learn how to size contacts for resistive, inductive, and motor loads, wire coils, and test relays.
Components & PrototypingThe Binary System of Numbers Uses Which Two Digits? A Maker's Guide to 0s and 1s
The binary system of numbers uses which two digits? We break down how 0 and 1 translate to physical voltages in microcontrollers and logic circuits.
Components & PrototypingEssential Magnetism Info for Sizing Inductors and Electromagnets
Practical magnetism info for DIY power supplies and solenoids. Learn to calculate core saturation, size inductors, and pick the right core material.
Components & PrototypingThe Ultimate PCB Guide: Trace Sizing, Prototyping, and First-Spin Testing
A practical PCB guide covering trace width vs current calculations, breadboard-to-PCB migration checklists, and first-spin board testing protocols.
Switches & OutletsLeviton DZ6HD Wiring Diagram: Please Follow This Exact Node Trace
Complete Leviton DZ6HD smart dimmer wiring diagram walkthrough. Includes node-by-node trace, terminal mapping, and multimeter verification steps.
Components & PrototypingWatt Amp Calculation: Formulas, Data Tables, and Solved Examples
Master the watt amp calculation with defined formulas, real-world load tables, and step-by-step solved examples for DC and AC circuits.
Components & PrototypingHow to Use a Power Voltage Current Calculator for DC and AC Circuits
Master the power voltage current calculator formula. See worked examples, unit tracking, and a real-world BMS trip scenario to size your circuits right.