Monday, July 31, 2006

Controlling LED Arrays on TCP/IP Networks

The new Color LED matrix controllers from Spark Fun Electronics provide a fun way to control 8 x 8 color (RGB) LED matrices. Connecting directly onto a common cathode RGB 8 x 8 LED array, the controller "back pack" provides a simple serial interface to the LEDs. This eliminates the headaches of switching 192 discrete LEDs on and off.
While this is all nice, we still need some way to control the LED controller; something that will send it the image data. This tutorial focuses on controlling one or more LED matrices over TCP/IP using an embedded ethernet board. The LED array becomes a server on the network and may be updated from any computer on the network running a simple JAVA client program. This is a versatile way to control the matrix and it allows for huge expansion. In this tutorial, one LED matrix is connected to the network. But using the same techniques, many LED matrices may be controlled over the network. And if this network is connected to the internet and properly set up, the LED matrices may be controlled from anywhere in the world! LINK
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Friday, July 21, 2006

Bingo!!! (on your tv)

This design is based on the video DVM and cronograph design. It supports color, so numbers not yet drawn (all but 1 and 87 in the picture on the left) are displayed in green and the others in white. White lines are intentional, according to the Italian rules the drawer itself takes place in game choosing one of the six regions.
more infomation visit
Bingo!!! (on your TV)

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Wednesday, July 19, 2006

Rain detector

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Friday, July 14, 2006

Good UHF Schematics

Good UHF Schematics


CMOS Inverter VCO tunes octave to UHF: 11/19/98 EDN-Design Ideas


UHF T Volt Preamplifier:

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Sunday, July 09, 2006

Keypad Circuits

µC Provides Wireless Keypad Control: 10/08/98 EDN-Design Ideas

4 Bit µP`s a / D Converter Decodes Keypad`s Inputs: 10/13/94 EDN-Design Ideas

4 Digit Keypad:

Alarm Control keypad:

Decimal to BCD Convertor: This circuit will provide an output in Binary Coded Decimal from any of the input switches. The input switches may be expanded to 16 switches, providing a Hexadecimal to BCD conversion.

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