This circuit is used to control a total of three independent processes: Generating video signal Revenue characters from the keyboard, decoding and sending to the serial line Revenue characters from the serial line and store into memory for display Source: Pandatron

Universal tester of semiconductor components with detection and simple control detects an unknown component and its basic parameters. Currently supports the following devices: Transistors type NPN, PNP, N-MOS, PE-MOS, ND-MOS, PD-MOS, N-JFET and P-JFET. Source:Pandatron

This is a very simple and easy to build programmer for Atmel microcontrollers from AVR family. The microcontrollers must support serial programming. This programmer is connected to a PC through the RS232 serial interface and can be used with the PonyProg or Avrdude software programmer. Source: diy4fun

This small circuit is very simple to make,with only few components caps, resistors and the heart of this circuit is Attiny84 microcontroller running at 20MHz. Source: 5volt

I needed a solution to remotely turn on a computer. There are many hardware devices you can buy, but I thought Wake on LAN (WOL) would be the ideal solution and give me a chance to experiment with Microchips ENC28J60 Ethernet controller chip. WOL is a computer networking standard that allows a shut-down computer to [...]

This project shows the temperature on a three digit 7-segment display, it measures the temperature from -9.5 to 99 degrees Celcius in 0.5 C steps, or from 0 to 210 degrees Fahrenheit in 1.0 degrees steps. Because of the LED display the temperature is also readable in the dark. The TCN75 from MicroChip is used [...]

Tired of spending hours and hours in wire soldering? Do your circuits look ugly and you are looking for a way to produce professional-like PCBs? Then you had better try photoetching. And the first step to do that is to have the right equipment that is an Automated Exposure Box. Source: Theodosiou Antonios

This circuit  is a small thermometer with a 2×16 characters display (see HD44780 LC-Displays ) that shows the current temperature and extreme values, i.e. minimum and maximum temperature. The PCB is designed to fit behind the display so that it is possible to build up a quite small device. Download: * Eagle-project (PCB layout) C [...]

A very interesting project, digital solid mega8515 At-at-tiny12 source software based on the files and diagrams. Download: TV Oscilloscope.rar

The Midea IR signal uses pulse distance encoding. Each pulse (one “time” unit or 1T) is 21 cycles of a 38KHz carrier burst (about 550µs long). A logic “1″ is a 1T pulse followed by a 3T space and takes 2.25ms to transmit. A logic “0″ is a 1T pulse followed by a 1T space [...]

Atmel does offer an adapter board to support this chip along with another one with slightly more I/O lines. The STK505 adapter, which is reasonably priced at US$75, would be a great solution. Unfortunately, I’m stuck in China and it’s not available over here. So… it’s time for a roll-your-own solution. While a lot of [...]