LED - Tobiscorner

DIY RGB Matrix

Components:

foam rubber as carrier for the LED's
10mm diffuse RGB LED's (I used those sold here: http://evilmadscience.com/partsmenu/89-led )
silver wire
insulating tape
solder iron

Continue reading Comments (1) 08.02.2010. 16:30

Inspired by http://tinkerlog.com/2009/04/05/driving-an-led-with-or-without-a-resistor/ I started to build a USB driven display. I ordered some big green 5x7 dotmatrix display from http://evilmadscience.com/ and had a look at v-usb.

What you get when combining those is a via USB controllable dotmatrix display. The PC related programming I did in Python using libusb and the python binding called pyusb. So the program should be cross platform compatible! Also python allows one to extend the functionality(e.g. checking for new mail, usb notifications of any type...) very easy.

Continue reading Comments (1) 01.02.2010. 12:27

RGB LED Matrix

What can you do with 100 common anode rgb leds? Build a 8x8 matrix and interface it!

The circuit uses 74HC595 shift registers with output latch. Each shiftregister interfaces one color + one shiftreg for the matrix rows. The interfaces uses 6 I/O lines for faster speed and easier interfacing. An AVR running at 8MHz can update the matrix with 8 brightness levels displaying nice fading colors patterns or colored text (or both). The sample program creates fading color patterns using a sine table. For smoother display a double buffer was implemented.

Continue reading Comments (3) 13.05.2008. 18:02

Big 7-segment Display Clock

I've bought some 14cm high red 7-segment LED Displays on EBay and started to build a clock based on AVR ATTiny2313.
The circuit is build with an AVR ATTiny2313 a UDN2982 high side and a ULN2803 low side driver/switch.

Continue reading Comments (3) 19.03.2008. 10:28