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**tetsu-jp** · 22-11-2011, 08:37 AM

my site address has changed:

http://pic.hitechworld.org

wiki was installed:

http://hitechworld.org

Here you see one prototype I built a few days ago.
http://www.youtube.com/watch?v=BS8MEXvWjDE

5x5 LED matrix, 16f1824, 74hc595 anodes drive, fdv301N digital MOSFET kathodes sink.
MCP1640 dc/dc converter- works from 1.2v NiMH battery.

Scrolling message algorithm was programmed. To modularize it (RISC assembly), and to use proportional font, the complete scroll is at first built inside the internal RAM, and then read-out column-by-column. 1 byte= 1 column, only 5 bits are used.

Modularized means the bitmap generation from font, and the scrolling itself are completely independent.

bright LEDs by a good days work, on Flickr

22-11-2011, 08:37 AM	#2
tetsu-jp Đệ tử 1 túi Tham gia ngày: May 2011 Nơi Cư Ngụ: nước Đức Bài gửi: 18 :	my site address has changed: http://pic.hitechworld.org wiki was installed: http://hitechworld.org Here you see one prototype I built a few days ago. http://www.youtube.com/watch?v=BS8MEXvWjDE 5x5 LED matrix, 16f1824, 74hc595 anodes drive, fdv301N digital MOSFET kathodes sink. MCP1640 dc/dc converter- works from 1.2v NiMH battery. Scrolling message algorithm was programmed. To modularize it (RISC assembly), and to use proportional font, the complete scroll is at first built inside the internal RAM, and then read-out column-by-column. 1 byte= 1 column, only 5 bits are used. Modularized means the bitmap generation from font, and the scrolling itself are completely independent. bright LEDs by a good days work, on Flickr