This is my little Christmas tree cat-compliant. Schematic and HEX code is available.

Details are here

LCARS switch

finalestep-by-step guide to build a working back-lit touch sensitive switch with the look and behaviour of Star Trek LCARS panels.

Infrared Repeater

irrepIt’s a little circuit to relay infrared remote signals from a room to another room.

Nothing fancy… no microcontroller, no firmware. Just a 555, a TMS5330 infared decoder (but almost any decoder should work), a long cable and an IR LED. That’s all.

I’ve used three of these circuits and I’m now able to use almost any remote in any room.

The trimmer on the circuit change the IR carrier frequency. It should be 38 Khz, but my appliances likes more a carrier of 42-43 Khz.

This is the schematic:


Multi-channel 12V light blinker

A PIC, 12 NPN transistors and a handful of other passive components.

This 12 channel light blinker has been connected to the lighting system of a train station scale model to simulate blinking light in different places and at different frequencies.

The “check panel” on the circuit, that shows with 12 mini-leds the output status, is very nice to see, but unfortunately I had not the chance to take a picture, but one day or another I’ll disassemble the full model to photograph the panel… :)

High power LED display

leddispThis was my first “real” project years ago (I mean … someone asked me for it and paid me !!!)

It’s a 16×16 LED matrix, driven without multiplexing, with a little logic on board to allow a PC to draw on the display connected to the parallel port. It was really bright, with just 16 of the 256 leds turned on, it was impossible to look directly at the display.

I built then a stand-alone controller, with some image sequence stored on EPROM, and placed all in a custom built aluminium box. This was used as a sample to show display capabilities to potential customers.

Obviously the customer kept the 16×16 version But I kept for me the very first 8×8 prototype (the one in the picture), entirely wired by hand.