This is extremely simple to build PIC Temperature meter that allows to measure temperature in two different locations at the same time. Never before such a useful and powerful circuit could be built with so little components and yet provide endless possibilities. This is all possible thanks to the use of PIC16F628 microcontroller and 2×16 character LCD display that act like a small computer which can be customizable thanks to upgradeable hex firmware.
PIC Dual Temperature Meter - [Link]
This is so called persistence of vision when the perceptual processes of the retina of the human eye retains an image for a brief moment. Such inertia causes an illusion of motion rather separate frames displayed in quick succession. So this illusion technique can be used in many areas. Probably you are avare about rotating clock projects so why not to put similar technique in bicycle tire and look cool in the dark.
Raphaël Assénat have been developing a rotating LED bar on bicycle wheel for quite long time and came up with several versions of project. The newest is capable to read RPM of wheel and display value with LEDs. Also Display scan rate is fixed what allows to display smoothly at any rotating speed.
Displaying text on a bicycle wheel - [Link]
As COM ports are disappearing form computers – especially from laptops, there are more and more USB to RS232(COM) adapters showing up in the Internet. The bigger choice the better to end user – he can look and build the best solution that fits his needs. This particular adapter was developed by Alex Sidorenko and its main purpose was to comply RS232 to USB of car ODB(On-Board Diagnostic) unit.
Simple USB to RS232 adapter on PIC18F2455 – [Link]
Strangeness of this clock is in its expression of numbers, which is realized using seven Leds. Leds are located inside a pipe, one above another and if we move Leds enough fast left or right, we have a space where we can write numbers, characters or anything else. All these are possible only if we turn on specific Leds at precision timing. Moving LEDs left or right is achieved using a steel plate, so we have to tense the pipe in one direction (left or right) and let pipe to vibrate by itself.
Unusual clock with AT89C2051 - [Link]
From the beginning, Leds are used in many applications for signalization purposes. For what else can be Led used except for signalization or lighting? You can use it in another way, and some times that may be very useful. Usual Leds can be used as ambient light sensors, where Led can be used for signalization or as ambient light sensors. The idea is very simple, just look at schematic.
Led Sensor - [Link]
Raph has designed this board for NES/SNES controllers to USB, but it found place in many more projects due to its small size and easy to use.
This board is only 27.5×17.7mm size and is equipped with Atmega8 microcontroller. Circuit is already adapted for Firmware-Only USB Driver from Objective development including 12MHz resonator. Also there are several I/O pins available for custom programming. Because board it self is double sided, there is a place for SMD voltage regulator.
Multipurpose tiny AVR microcontroller board – [Link]
Cool Music Driven Laser Pointer Light Show! – video powered by Metacafe
Sleepydog sent in this cheap and easy, make a very cool laser light show driven by your favorite music.
John writes in with a how-to on making a Nikon D70 IR remote control
“This is just the thing you need to have in your camera bag. I have one that I bought online but if your not in a rush and have the skills to solder this would be a clever little device to have around. Very handy for tripping the shutter when your doing macro work or your doing long exposures where camera vibration is a bad thing.”
Make a Nikon D70 IR remote control - [Link]
The IR Widget captures the infrared signals used by remote controls. It operates in a way that makes it compatible with modern multitasking operating systems. It is able to determine the carrier frequency and demodulate the carrier in the digital or analog domain. The captured information can be used to view, recognize or reproduce the signal. The hardware is designed to be as simple and low cost as possible. A PIC12F629 was used for development, but almost any PIC that uses the 12 or 14 bit instruction set could be used. There are also 74HC based circuits for Luddites who refuse to use microcontrollers.
The IR Widget - [Link]
I haven’t used these folks but their selection is really impressive. Might be worth checking out if you need to make or build an enclosure for a project… -
Over 600 unique combinations of options are possible when you choose the DIY-1712 chassis, our most universal chassis. These options include: three base styles, 6 front panels, 8 different knobs, ventilated or blank top panels, and blank, or IEC-cutout rear panels. Our chassis are designed to accommodate both solid state and tube-based equipment, by providing you with the option of a .050″ (1.3mm) ventilated top panel, or a blank .080″ (2mm) top panel.
DIY Enclosures - [Link]