If you’re like me, you may or may not have secret files plotting world domination and other devious deeds. These files obviously need to be hidden from the prying eyes of sisters, FBI agents, grandparents, etc. We are going to convert a phone jack in the wall into a secret USB memory device. Source: stonehenge360

This CNC milling machine that costs less than $100 (currently $87) to build. It can mill PCBs, wood, and even mild steel. All of the machine’s structure is MDO and is designed to be milled on the ShopBot. The leadscrews and leadscrew nuts require drilling and tapping operations that are preferrably perfomed on a lathe. [...]

This wireless hidden water gun is a real treat.Schematics and source code can be found at AVRFreaks but you must to be register.This video explain and shows the setup in action. The prankster holds onto a wireless AVR remote, and when the unsuspecting victim walks by, he activates a second AVR controlling a pump; spraying [...]

This simple device allows you to check the correct working of the USB ports of any computer, using a green led and message from your operative system.It will allow you to test the proper assembly of any port without risking any expensive device.If you normally work fixing computers this is a must in your tool [...]

eMail Light project is to indicate the presence of emails that are currently on my email server with a flashing LED. I am often not right at my desk and I would like to know if I have email. Or I am near my desk, but my screen saver has kicked in while I’m working [...]

This battery charger automatically starts the charging procedure when battery voltage drops below a certain predefined value and stops after the voltage has risen above the maximum allowed value. Setup can’t be easier, just connect two alligator clips to battery terminals and plug the device in mains. This way it can stay connected for months [...]

The heart of this project Intelligent Battery Charger is PIC16F628. Macobt found this project on this forum and he build it this project and he tested, and it works ok,  but there is several things need to be calibrated correctly to run the charger properly. Source: Macobt

The author of this project is Stanislav (Comodore) and he  explained how to make a simple fast blinking LED light that you can attach to your bike or any where you want. It blinks more than 3 times in a second. It is cheaper to make one than to buy one. You can make it [...]

Siren is a very straightforward device but for beginners it is an excellent starting point since it directly interacts with real world via sound and is a great morale booster for next, more advanced projects that shall come. Source: Sindija1204

Soldering stations comes in a variety of prices and capabilities. The cheaper stations have a power controller, to control the power delivered to the soldering iron. More expensive stations will have a temperature controller near the tip of the soldering iron, and control the temperature using this feedback. The quality of soldering with a station [...]

The software is based on the HID demo from Microchip and has been adapted to interface the sensor instead of using a fixed mouse movement. The sensor itself is interfaced using the SPI protocol (see the sensor’s datasheet – ADNS 2610 Optical Mouse Sensor). Source: steffenschuette