NPN Transistor

Star Trails

Star Trails

Star trails are the paths left by stars as seen from the earth. As the earth spins, the stars appear to move and circle in the sky. To capture the star trails you need a camera, a tripod and an automated trigger for your camera. The Arduino, a relay and the camera’s remote control will […]

Continue Reading
High Voltage

High Voltage

I would like to show a few things Where to get a flyback 1. How to build a 555 timer driver circuit High voltage safety Dangers of this project Typical application

Continue Reading
SIM Card Reader/Writer Kit

SIM Card Reader/Writer Kit

With this SIM Card Reader and Writer kit, you are free to experiment with your SIM cards and the information that is stored on them! You can back up stored SIM card data, recover deleted SMS’s and phone contacts, and even examine the last 10 phone numbers dialed!

Continue Reading
Whack-a-Mole Game

Whack-a-Mole Game

Jim Chen designed an excellent electronic “Whack-a-Mole” game using 555 timers, LEDs, and bent-diode touch sensors, that you can build on a solderless breadboard

Continue Reading
Yobot: Arduino Yogurt Maker

Yobot: Arduino Yogurt Maker

I’m lazy. My impatience often leads me to botch important steps when I make yogurt. So to get better control over the fermentation process, I made a crockpot thermostat attachment to precisely control the temperature. You can buy electric yogurt makers, but most of them only incubate; the heating/sterilization step still has to be done […]

Continue Reading