Tiny Basic Controller (TBC) is a simple device that can operate as a PLC (program logic controller) for home automation, control, etc. The control program is a text version of BASIC language.

(Photo from cqham.ru)

Ten years ago was Nokia 5110 The Big Cellphone. Here is an useful recycling: Digital tachometer with a 5110 LCD.

(Source: Elfly.pl)

This is really great board: AVR Ethernet I/O board with 2x RS232, 2x USB connector, BW composite video, Real Time Clock with battery backup, PS/2 keyboard connector, Wiz810MJ ethernet module and LCD 16x2 display.

Photo: Ben Zijlstra

Everyone knows the problem: You have a transistor, but you can't read its signature. Or you can't find the datasheet... You have a diode, but... You have a capacitor, but you can't read... Here is a smarty solution.

Two homemade signal generators, based on AVR microcontrollers.

A very simple circuit, providing sensor connection via an USB.

A small acceleration sensing device in form of a USB stick.

TellyMate is a VT-52 compatible terminal display device that takes data from a RS-232 and outputs text to a TV screen, developed by guys from Batsocks.

IR-controlled Etch-a-Sketch based on Atmel ATMega8 and Nokia 3310 LCD.

Based on great Till Harbaum work (already mentioned here), Barry Carter makes this terrific USB to I2C interface.