arduino-direct-matrix-8x8

A small device that produce 8x8 display with a single ATmega microcontroler and a led display.

Todo

• Add a IR led/sensor to communicate with neighbours ;
• Add a switch to select "today's-mood".

See also

• https://wiki.raumzeitlabor.de/wiki/Hacklace/en
• https://sites.google.com/site/tinymatrix/
• https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnx0aW55bWF0cml4fGd4OjRkMWNjZjFhMWM5ZmYyMmM (TinyMatrix.c)
• http://tinkerlog.com/howto/64pixels/

Nuts & Bolts

How to store in flash:

const unsigned char FONT_CHARS[96][5] PROGMEM =
{
	{ 0x00, 0x00, 0x00, 0x00, 0x00 },  // (space)
	{ 0x00, 0x00, 0x5F, 0x00, 0x00 },  // !
	{ 0x00, 0x07, 0x00, 0x07, 0x00 },  // "
...

How to read in flash:

byte = pgm_read_byte(&(charset[c][y]));