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The purpose of this timer is to provide a countdown time from 1 second to 99 minutes & 59 seconds. I use it to control the lighting for the Ultra-Violet exposure of photosensitive PCB material. The project provides also an audible alarm at the end of the countdown time and switches the [...]

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The device consists of six LED matrix displays 8×8px, so that the overall resolution of the display is 48×8px. Do LED display text can upload a maximum of 128 characters long, that gradually the entire dump gradually slid characters left. Loading text is done using a PC via the serial interface RS-232. Source: svetelektro

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In Figure we can see a general outline of the preamplifier. La señal de entrada se aplica a la primera etapa compuesta por el circuito integrado U1, TL071 y los componentes asociados. The input signal is applied to the first stage comprises the integrated circuit U1, TL071 and associated components. La ganancia de esta etapa [...]

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Here is the description a 32 outputs MIDI able to switch relays, electromagnetics devices… in order to automate a mechanical musical instrument, or command lights… Principle: MIDI datas from a musical instrument equipped with an MIDI output or from a sound card of a computer are analyzed by the software present on the PIC 16F84. Optocouplor IC10 [...]

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The Witness Camera is an automated, self-recording surveillance camera, that uses a gigabyte-class flash card as recording media. I designed the Witnesscam because available surveillance solutions were too expensive or impractical for home use. I built the system from a VGA CMOS colour camera, a passive-infrared (PIR) movement sensor, an ATmega32 processor, and a 1GB SD-card. The [...]