Garage Geek Guy
Hands-on electronics and DIY from the workshop.
Latest from the workshop
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Welcome to the Garage Geek Guy blog
A written companion to the YouTube channel — build logs, schematics, and project notes you can actually skim.
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I Bought the Elm Eco Pro 2 Key Card Hack — and It Works
The Elm Eco Pro 2 disc resurfacing machine runs on proprietary timed key cards that expire after 800 minutes. A UK modder built a small microcontroller hack that gives you unlimited time for $138.
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How to Use the L298N Motor Driver with Arduino — Wiring + PWM Speed Control
Everything you need to wire and code the L298N dual H-bridge motor driver with Arduino — IN1-4, ENA/ENB, common ground, PWM speed control, and the stall-current trick nobody documents.
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The $15 Amazon Arduino Robot Chassis — Assembly Walkthrough
A two-wheel-drive acrylic robot chassis from Amazon costs $15 and includes motors, wheels, a caster, encoder discs, and hardware. Add ~$15 in electronics and you have a complete robot platform.
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How to Measure Distance with an Arduino and HC-SR04 Ultrasonic Sensor
The HC-SR04 is dollar-store radar for your Arduino — four pins, a library, and a few lines of code give you distance readings in centimeters. Here is how to wire it, code it, and deal with its quirks.
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How to Use a Real Time Clock with Arduino — DS1307 RTC Tutorial
The Arduino loses track of time the moment you unplug it. The DS1307 RTC module fixes that with a coin-cell backup and an I2C interface simple enough to share a bus with your LCD. Full walkthrough from address scan to LCD display.