Blog
Build logs, project notes, and write-ups from the workshop.
- How to Find the I2C Address of Any Device Using an Arduino Before you can talk to an I2C device, you need its address. An I2C scanner sketch brute-forces all 127 possible addresses and reports what it finds in the serial monitor — two minutes of setup and you have the number you need.
- How to Use a Servo Motor with an Arduino Wiring an SG90 9g servo to an Arduino Uno and running the Sweep example — three wires, one library, and the important rule about which servos you can actually power from the board.
- How to Fix the Arduino Uno Serial Port Problem on Mac Arduino clone not showing a serial port in the IDE on macOS? The fix is a CH340 driver install plus one terminal command. Here is exactly what to do.
- Tascam CD-RW900SL: How to Record a CD from an Analog or Digital Source A quick-start guide to the Tascam CD-RW900SL professional CD recorder — loading media, monitoring levels, starting a recording, and finalizing the disc so it plays anywhere.
- TI-99/4A AV Cable DIY — Build a 5-Pin DIN to Composite Video Adapter Skip the RF modulator. A 5-pin DIN connector, a spare RCA cable, and an hour at the bench gives your TI-99/4A a clean composite video signal into any modern TV.
- What Is an Arduino? A Beginner's Intro (Plus 13 Cool Projects You Can Build) Arduino is the framework that made electronics accessible to everyone. This post breaks down what it actually is — hardware, software, and community — and shows 13 real projects to prove the point.
- Banggood Arduino UNO Starter Kit and L298N Robot Kit Arrive — New Series Upcoming Banggood sends over an Arduino UNO R3 starter kit and an L298N 2WD ultrasonic robot kit. Unboxing both, plus a channel rebrand: welcome to Garage Geek Guy.
- How to Cut Perfect Outlet Holes in Drywall with the Blind Mark XT A real-world review of the Blind Mark XT magnetic outlet locator after 40+ outlet holes across a full flood reconstruction — how it works, how to pair it with a RotoZip, and why every other method is harder.
- How to Remove Permanent Marker and Clean NES Game Contacts A Magic Eraser takes Sharpie off NES cartridge shells in under a minute. Isopropyl alcohol on a cotton swab handles the contacts. Together, they fix roughly 90% of games that refuse to load.
- How to Replace the Battery in Pokémon Sapphire (Game Boy Advance) When the CR1616 battery dies in a GBA Pokémon game, the real-time clock stops — but your save data is safe. Here is how to replace it, what battery to use, and why size actually matters here.