Posted on 24 Jun 2008
Are you a chess fanatic and you need to play in the dark for some reason? If yes,check out this project.It designed by a member on Instructables, Tetranitrate writes:
had just picked up a cheap-o glass chess set at my local arcade for the low low price of only 15,000 tickets. The novelty of playing with glass pieces quickly wore off, and I wondered how I could make it better. The thought of illuminating the set seemed very appealing, but there were so many different ways that could be done.
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Posted on 15 Jun 2008
Built from a modified AVR development board manufactured by Olimex, Pass Key is a sweet little 5V “candy bar” style computer that can generate 16-digit alphanumeric passwords as fast as you can press a button.The original AVR-MT dev board requires 10-14V, but with a little circuitry magic, this power demand can be sliced to a scant 5V without losing any of the display, buzzer, LED, button or computational capabilities of the original dev board.[more]
Posted on 13 Jun 2008
It uses a matrix of 100 LED’s for a display, and does suffer from being slow and having rather poor resolution. Still we could display a sine wave running at 500Hz without trouble, that that’s not all that dissimilar to commercial solid state osscilloscopes.The circuit displays an understanding of the mechanics of displaying an analogue waveform. The timebase is simply a 555 generating a horizontal sweep, while the vertical amplifier is 3914 with a trimpot on the front. It’s extremely simple, but it works. [more]
Posted on 12 Jun 2008
This sample project uses a PIC16F628 and 8 LED’s to count in binary. Four switches are used to change the direction and speed of the counter. The program was created using JAL.[more]
Posted on 09 Jun 2008
John writes:I read some articles on LED arrays. They described using arrays of 64 or more LEDs as crude oscilloscopes and other interesting things. I decided I’d make one myself - a really big array, 256 LEDs arranged as 16 columns by 16 rows. In 1983, while I was in my final semester of electronics classes at Monterey Peninsula College, I designed my array. I wanted a high-density array, in part to make the PC board smaller, but mainly to give a better appearance. [more]
