Electronics
Mini Self-Balancing Robot
A miniature two-wheeled self-balancing robot using a XIAO ESP32C3, an MPU6050 gyro/accelerometer, and 3V gear motors.
3 min read624
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Electronics Projects & Tutorials
Arduino, ESP32, circuit design, sensors, and embedded systems — published from the CMS and updated through Admin → Content.
24 articlesIoT & sensors
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project
Keyestudio Stone Thrower
A STEM kit for building a small catapult (stone thrower) that can be controlled by a Micro:bit or ESP32 board, using servos and sensors.
4/12/20263 min read
article
Altium vs KiCad for a One-Person Hardware Consultancy: A 2024 Reassessment
Altium's perpetual license cost is hard to justify for intermittent consultancy work. KiCad 8's hierarchical schematic and constraint manager close most of the gap.
2/22/202428 min read
article
Building a Smart Home IoT Dashboard with ESP32 and React
Complete guide to creating a real-time IoT dashboard that monitors temperature, humidity, and motion sensors using ESP32 microcontrollers and a modern React frontend.
1/15/202415 min read
article
Advanced PCB Design Techniques for High-Speed Digital Circuits
Master the art of high-speed PCB design with comprehensive coverage of signal integrity, power distribution, EMI reduction, and advanced routing techniques for modern digital systems.
1/12/202419 min read
article
SDR GPS Timing Notes: Disciplining a Local Oscillator With a $25 Dongle
A RTL-SDR v4 plus a cheap active GPS antenna can discipline a local oscillator to sub-microsecond accuracy. The software stack is the hard part.
10/31/202332 min read
article
KiCad 7 Workflow Notes: What Changed From Version 6 That Actually Matters
The new constraint engine and interactive router improvements in KiCad 7 are real productivity wins. The footprint wizard regressions are equally real.
4/2/202327 min read
article
Thermal Camera PCB Debugging: Five Cases Where It Found What the DMM Missed
A $300 thermal camera paid for itself in the first week. Hotspots, bad solder joints, and a regulator running 40°C above its expected temperature.
10/3/202225 min read
article
EMI Bench Testing Notes: What a Spectrum Analyzer Under $500 Actually Shows You
Pre-compliance EMI testing with a $400 SDR and a near-field probe set tells you more than you'd expect — and less than you need for a formal chamber test.
9/1/202227 min read
article
Power Sequencing Design Notes: When Rails Come Up in the Wrong Order
A processor that sees its I/O rails before its core rail will latch up. Hard to reproduce, catastrophic in production. A methodical approach to sequencing.
7/14/202227 min read
article
Component Substitution During Supply Chain Crunch: Risk Tiers and Documentation
2021–2022 forced every hardware team I know to substitute components. The ones that shipped without quality escapes were methodical about it. Here is the tier system we used.
3/7/202229 min read
article
Antenna Design for IoT Devices: PCB Trace Antennas vs Chip Antennas at 2.4 GHz
A chip antenna is $0.15 and works if you follow the clearance rules. A PCB trace antenna is free and performs comparably if your manufacturer holds 5-mil tolerance. The comparison from a real product.
2/23/202225 min read
project
Automated Chessboard
Electromagnet chessboard with sensor grid and AI chess engine.
1/31/202211 min read
project
Smart Fire Detection
Fire and smoke detection system with MQ-2 sensor, flame sensor, and buzzer alarm.
1/24/202211 min read
project
Gas Leakage Bot
Mobile robot with MQ gas sensors, GPS, and GSM for gas leak detection and alerts.
1/17/202211 min read
project
Smart Cup Coaster
A coaster that senses cup temperature via TMP006 sensor and displays LED feedback.
1/10/202210 min read
project
RC Boat
Build a remote-controlled boat with Arduino, motor driver, and servo for steering.
1/3/202211 min read
project
Remote Plant Monitor
An IoT device that monitors a plant's soil moisture and other environmental conditions, sending data to a database like InfluxDB for remote viewing.
12/27/202111 min read
project
Heart Rate & SpO2 Monitor
A personal health device that measures heart rate and blood oxygen saturation (SpO2) using a pulse oximeter sensor and displays the data on an OLED screen.
12/20/202111 min read
project
Smart Door Lock
An IoT door lock system that uses an ESP8266, a solenoid lock, and a biometric sensor for secure, keyless entry.
12/13/202111 min read
project
Smart Mirror
A DIY smart mirror that displays information like time, weather, and news. It uses a Raspberry Pi, a monitor, and a two-way mirror.
12/6/202114 min read
project
Smartphone Controlled IoT Car
An IoT car that can be remotely controlled at high speed via a smartphone, using a NodeMCU for Wi-Fi connectivity.
11/29/202111 min read
project
Walking Spider Robot
A 3D-printed crawling spider robot that uses an Arduino Nano and 12 servo motors to achieve life-like walking movements.
11/22/202111 min read