LED screen – LED line part based on AVR, Linux and WiFi

[Vermes]

LED banner:
Described here component of the LED screen – LED line – is its basic element. The whole device consists of 128 such LED lines. A PC under the control of Linux Debian is a very advanced remote information display system. Cooperation with a webmaster makes it possible to start a web server, ftp, mySQL and facilitates control over the emission of video content.



LED line
The entire construction is based on LED lines connected in series, which form a row of pixels in RGB system. There are four LED lines connected in a row, what gives a total of 192 LEDs. One pixel consists of three diodes in basic colors: red, green and blue. Different levels of light of the individual diodes cause that a multicolor light spot is visible from a distance of 10 meters. As a consequence, whole rows create the screen resolution. In this case it is 64x32 spots.



MBI 5031:
MBI5031 is the basis of the screen system. Using this circuit, when provided external clocking, the brightness of lighting of the individual LEDs. PWM control allows you to determine up to 4096 brightness levels. In this particular case, that number was reduced to 256 hues, what resulted in 16 million of RGB hues.



Schematic of a LED line:



Schematic of LED line tester:



Link to original thread (useful attachment) - Ekran LED - część Linia LED - jak go zrobiłem (AVR, Linux, WiFi)