LED used as touch/light sensor

LED is a light emitting diode, it is commonly used as output device. But by connecting each end with GPIO, you can use it as input device with some software tricks. This idea is cool, and I remember the first time when I got this idea was from the cool research site "Multi-Touch Sensing through LED Matrix Displays", you can find the information here:
http://cs.nyu.edu/~jhan/ledtouch/

Recently, I found someone use the same idea to implement a LED input sensing demo with ATmega8, it is very interesting.

LED fake candle made from ATtiny13

AVR tiny13 with limited IO, small and powerful, so it is really good to make a DIY LED candle.


Link:
http://www.electronics-lab.com/blog/?p=2948

LED figure in Japan.

Just come across this funny toy, the paints on the figure looks like RGB Led, and it is equipped with LED inside, it grows in dark:)

AVR tiny powered by Lemon!!

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Tiny13V is aimed for running on low power condition! How low is it? It can be powered by the natural battery "Lemon".

Procyon AVRLib - C-language Function Libary by Pascal Stang.

Pascal Stang is really nice to make the AVRlib freely available for AVR developers. (he is also the author of ARMLib).

The AVR Lib contains codes for nearly all the function that AVR chip provide, eg. UART, I2C, SPI, PWM etc. Also it includes some high level functions like IDE/CF, GPS, LCD modules.

I didn't try it, but I am going to use it for the next project. Stay tuned.

Link:
http://hubbard.engr.scu.edu/embedded/avr/avrlib/index.html

Research on accessing SD card with AVR.

Using AVR as a data logging system is cool, but data storage is a great problem as external eeprom or flash memory may be too small and expensive. I guess most of us have some 16MB and smaller SD card on your desk because nowadays you are using 2G SD cards on your camera!

Here are some links may useful:
http://www.captain.at/electronic-atmega-mmc.php
http://www.avrfreaks.net/index.php?name=PNphpBB2&file=printview&t=61851&start=0
http://www.roland-riegel.de/sd-reader/doc/index.html

4D OLED with Arduino.

4D Systems makes some really nice serial OLEDS. They aren't hard to use, but the documentation for them is very scattered. This tutorial pulls together the various pieces i've found so that you can get up and running very quickly.

Link:
http://jennylc.com/4d/