project2 min read
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.
Apr 12, 2026679 views
Back to Collections
Electronics
Arduino projects, circuit design, PCB development, and electronic prototyping tutorials
33 articles•Updated regularly•Curated by Manish
Featured Article
project
Mini Self-Balancing Robot
A miniature two-wheeled self-balancing robot using a XIAO ESP32C3, an MPU6050 gyro/accelerometer, and 3V gear motors.
July 1, 2026
2 min read
628
All Articles
article28 min read
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.
Feb 22, 202462 views
article15 min read
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.
Jan 15, 2024472 views
article19 min read
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.
Jan 12, 2024290 views
article32 min read
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.
Oct 31, 202382 views
article27 min read
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.
Apr 2, 202356 views
article25 min read
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.
Oct 3, 202260 views
article27 min read
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.
Sep 1, 2022264 views
article27 min read
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.
Jul 14, 2022114 views
article29 min read
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.
Mar 7, 202260 views
article25 min read
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.
Feb 23, 202258 views