Telephone-related ASCII Schematics V1.01
   Telephone in use light
   Detecting a telephone RING
   (manual) Phone In-Use Light
   Phone to audio interface (SSI202 input)
   Phone Off-Hook Indicator
   'phone rang' indicator light
   Phone Line to Audio
   Phone in-use
   Telephone Line Monitor (Plans)
   Use old phones as an intercom
   Phone-In-Use indicator
   Telephone Power?
   Hold function for Telephone
   Digital/Standard Phone Line Tester

Pic-Plot2
GPIB to USB converter

Due to the very high prices of comercial usb-gpib-adapters I tried to build one with a Microcip PIC18f2550 which has just enough I/O-pins, an USB-interface and is quite cheap.

HD44780 Library - avr freaks

Basic routines for interfacing a HD44780U-based text LCD display.

Custom Character Calculator

The xPL Project was started in January 2003 by Ian Lowe and Tony Tofts. It’s goal: To create a unified protocol to allow the control and monitoring of all devices within the home, whilst maintaining an unparalleled level of simplicity and ease of use. During the first half of 2003, the protocol was refined to include powerful auto-discovery and configuration capabilities. With the core protocol now in place, much of the work involves integrating xPL support into software and hardware devices.