I have been thinking about hacking my boring door bell for years. I want want mine to knock on the door when the door bell is pressed. The guys over at PopSci have come up with a cool way to make what they call a Ding Tone Door Bell, have a look it looks like fun. 🙂 “If you’ve got a spare MP3 player laying around your home, it’s time
George from AmateurLogic.TV puts together a surface mount software defined radio kit in this episode. “George builds the Softrock Software Defined Radio. Jim introduces us to the International Beacon Project. Tommy demonstrates and explains all about the amazing Ham Radio Deluxe. Peter is back with a mountain top review of the Degen DE-1103 shortwave receiver.”
Jordan Crittenden and Edwin Lai built this DIY Polygraph, their goal was to construct it for $50.00. “The basic design of the polygraph is shown in the diagram to the right. The four analog circuits: plethysmograph (pulse rate meter), GSR meter, breathing rate meter, and audio preamplifier, are attached to the first four pins of the Mega32 analog to digital converter (ADC). The polygraph can then be run in one
Tobias Hocke has built a cool binary clock that is based around the ATmega8515 microcontroller. Slap in a 9 volt battery and push a few buttons to set the time and you have a clock that very few people can read. Check out his site for a full schematic so you can build your own.
The VGA Test Box project allows a normal microcontroller to output directly to a CRT monitor for testing. “The goal of this project is to create a device that is capable of outputting VGA signals to a CRT monitor in order to display figures, text and characters. Timing is a core essential in this project. If the signal is off by even 1 microsecond, the signal synchronization with the CRT
This LEGO NXT robot is sure to be a hit at your next outdoor fireworks show. Just line it up and let it go. “This autonomous NXT robot will light multiple fireworks in a sequence – while the family sits back and watch the display!! It uses a MINDSTORMS NXT, two light sensors (one for navigation and other to detect a lighted fuse) and an Ultrasonic detector (to adjust
Click To Play Make has a great weekend project that shows you how to make a Joule Thief, this is a device that allows you to run an LED from a single 1.5 volt battery. For a similar project check out the rusty nail LED project. Via: Make Other than the toroid coil here is everything that you would need: 1K Resistor NPN Transistor Blue LED or White LED
