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  1. // Arduino 1.0.5 UNO R3
  2.  
  3. // Connections to board
  4. const byte latchPin=8;
  5. const byte clockPin=12;
  6. const byte data_R1=10;
  7. const byte data_R2=11;
  8. const byte en_74138=2;
  9. const byte la_74138=3;
  10. const byte lb_74138=4;
  11. const byte lc_74138=5;
  12. const byte ld_74138=6;
  13. byte ScanRow = 0;
  14. unsigned long counter;
  15.  
  16. //Insert message here ("message ")
  17. const char message[] = "Tustin High School T-Tech Academy     ";
  18.  
  19.  
  20. byte buffer[256] = { // Display buffer (which is scanned by the interrupt timer) of 8x32 bytes
  21.   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  22.   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  23.   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  24.   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  25.   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  26.   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  27.   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  28.   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  29.   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  30.   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  31.   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  32.   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  33.   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  34.   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  35.   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  36.   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  37. };
  38. // ---------------------------------------------------------------------------------------------------
  39. // FONTS sourced from various locations on the internet
  40. // full ASCII character set (8x16) (1520 bytes)
  41. const uint8_t font8x16_basic[] PROGMEM = {
  42.         /*   (32) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  43.     /* ! (33) */ 0x00, 0x00, 0x00, 0x18, 0x3C, 0x3C, 0x3C, 0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00,
  44.     /* " (34) */ 0x00, 0x00, 0x66, 0x66, 0x66, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  45.     /* # (35) */ 0x00, 0x00, 0x00, 0x00, 0x6C, 0x6C, 0xFE, 0x6C, 0x6C, 0x6C, 0xFE, 0x6C, 0x6C, 0x00, 0x00, 0x00,
  46.     /* $ (36) */ 0x00, 0x18, 0x18, 0x7C, 0xC6, 0xC2, 0xC0, 0x7C, 0x06, 0x06, 0x86, 0xC6, 0x7C, 0x18, 0x18, 0x00,   
  47.         /* % (37) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0xC2, 0xC6, 0x0C, 0x18, 0x30, 0x60, 0xC6, 0x86, 0x00, 0x00, 0x00,
  48.     /* & (38) */ 0x00, 0x00, 0x00, 0x38, 0x6C, 0x6C, 0x38, 0x76, 0xDC, 0xCC, 0xCC, 0xCC, 0x76, 0x00, 0x00, 0x00,
  49.     /* ' (39) */ 0x00, 0x00, 0x30, 0x30, 0x30, 0x60, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  50.     /* ( (40) */ 0x00, 0x00, 0x00, 0x0C, 0x18, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x18, 0x0C, 0x00, 0x00, 0x00,
  51.     /* ) (41) */ 0x00, 0x00, 0x00, 0x30, 0x18, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x18, 0x30, 0x00, 0x00, 0x00,
  52.     /* * (42) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x66, 0x3C, 0xFF, 0x3C, 0x66, 0x00, 0x00, 0x00, 0x00, 0x00,
  53.     /* + (43) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x7E, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00,
  54.     /* , (44) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x18, 0x30, 0x00, 0x00,
  55.     /* - (45) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFE, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  56.     /* . (46) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00,
  57.     /* / (47) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x06, 0x0C, 0x18, 0x30, 0x60, 0xC0, 0x80, 0x00, 0x00, 0x00,
  58.     /* 0 (48) */ 0x00, 0x00, 0x00, 0x3C, 0x66, 0xC3, 0xC3, 0xDB, 0xDB, 0xC3, 0xC3, 0x66, 0x3C, 0x00, 0x00, 0x00,
  59.     /* 1 (49) */ 0x00, 0x00, 0x00, 0x18, 0x38, 0x78, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x7E, 0x00, 0x00, 0x00,
  60.     /* 2 (50) */ 0x00, 0x00, 0x00, 0x7C, 0xC6, 0x06, 0x0C, 0x18, 0x30, 0x60, 0xC0, 0xC6, 0xFE, 0x00, 0x00, 0x00,
  61.     /* 3 (51) */ 0x00, 0x00, 0x00, 0x7C, 0xC6, 0x06, 0x06, 0x3C, 0x06, 0x06, 0x06, 0xC6, 0x7C, 0x00, 0x00, 0x00,
  62.     /* 4 (52) */ 0x00, 0x00, 0x00, 0x0C, 0x1C, 0x3C, 0x6C, 0xCC, 0xFE, 0x0C, 0x0C, 0x0C, 0x1E, 0x00, 0x00, 0x00,
  63.     /* 5 (53) */ 0x00, 0x00, 0x00, 0xFE, 0xC0, 0xC0, 0xC0, 0xFC, 0x06, 0x06, 0x06, 0xC6, 0x7C, 0x00, 0x00, 0x00,
  64.     /* 6 (54) */ 0x00, 0x00, 0x00, 0x38, 0x60, 0xC0, 0xC0, 0xFC, 0xC6, 0xC6, 0xC6, 0xC6, 0x7C, 0x00, 0x00, 0x00,
  65.     /* 7 (55) */ 0x00, 0x00, 0x00, 0xFE, 0xC6, 0x06, 0x06, 0x0C, 0x18, 0x30, 0x30, 0x30, 0x30, 0x00, 0x00, 0x00,
  66.     /* 8 (56) */ 0x00, 0x00, 0x00, 0x7C, 0xC6, 0xC6, 0xC6, 0x7C, 0xC6, 0xC6, 0xC6, 0xC6, 0x7C, 0x00, 0x00, 0x00,
  67.     /* 9 (57) */ 0x00, 0x00, 0x00, 0x7C, 0xC6, 0xC6, 0xC6, 0x7E, 0x06, 0x06, 0x06, 0x0C, 0x78, 0x00, 0x00, 0x00,
  68.     /* : (58) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00,
  69.     /* ; (59) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x18, 0x18, 0x30, 0x00, 0x00, 0x00,
  70.     /* < (60) */ 0x00, 0x00, 0x00, 0x00, 0x06, 0x0C, 0x18, 0x30, 0x60, 0x30, 0x18, 0x0C, 0x06, 0x00, 0x00, 0x00,
  71.     /* = (61) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7E, 0x00, 0x00, 0x7E, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  72.     /* > (62) */ 0x00, 0x00, 0x00, 0x00, 0x60, 0x30, 0x18, 0x0C, 0x06, 0x0C, 0x18, 0x30, 0x60, 0x00, 0x00, 0x00,
  73.     /* ? (63) */ 0x00, 0x00, 0x00, 0x7C, 0xC6, 0xC6, 0x0C, 0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00,
  74.     /* @ (64) */ 0x00, 0x00, 0x00, 0x00, 0x7C, 0xC6, 0xC6, 0xDE, 0xDE, 0xDE, 0xDC, 0xC0, 0x7C, 0x00, 0x00, 0x00,
  75.     /* A (65) */ 0x00, 0x00, 0x00, 0x10, 0x38, 0x6C, 0xC6, 0xC6, 0xFE, 0xC6, 0xC6, 0xC6, 0xC6, 0x00, 0x00, 0x00,
  76.     /* B (66) */ 0x00, 0x00, 0x00, 0xFC, 0x66, 0x66, 0x66, 0x7C, 0x66, 0x66, 0x66, 0x66, 0xFC, 0x00, 0x00, 0x00,
  77.     /* C (67) */ 0x00, 0x00, 0x00, 0x3C, 0x66, 0xC2, 0xC0, 0xC0, 0xC0, 0xC0, 0xC2, 0x66, 0x3C, 0x00, 0x00, 0x00,
  78.     /* D (68) */ 0x00, 0x00, 0x00, 0xF8, 0x6C, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x6C, 0xF8, 0x00, 0x00, 0x00,
  79.     /* E (69) */ 0x00, 0x00, 0x00, 0xFE, 0x66, 0x62, 0x68, 0x78, 0x68, 0x60, 0x62, 0x66, 0xFE, 0x00, 0x00, 0x00,
  80.     /* F (70) */ 0x00, 0x00, 0x00, 0xFE, 0x66, 0x62, 0x68, 0x78, 0x68, 0x60, 0x60, 0x60, 0xF0, 0x00, 0x00, 0x00,
  81.     /* G (71) */ 0x00, 0x00, 0x00, 0x3C, 0x66, 0xC2, 0xC0, 0xC0, 0xDE, 0xC6, 0xC6, 0x66, 0x3A, 0x00, 0x00, 0x00,
  82.     /* H (72) */ 0x00, 0x00, 0x00, 0xC6, 0xC6, 0xC6, 0xC6, 0xFE, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0x00, 0x00, 0x00,
  83.     /* I (73) */ 0x00, 0x00, 0x00, 0x3C, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3C, 0x00, 0x00, 0x00,
  84.     /* J (74) */ 0x00, 0x00, 0x00, 0x1E, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0xCC, 0xCC, 0xCC, 0x78, 0x00, 0x00, 0x00,
  85.     /* K (75) */ 0x00, 0x00, 0x00, 0xE6, 0x66, 0x66, 0x6C, 0x78, 0x78, 0x6C, 0x66, 0x66, 0xE6, 0x00, 0x00, 0x00,
  86.     /* L (76) */ 0x00, 0x00, 0x00, 0xF0, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x62, 0x66, 0xFE, 0x00, 0x00, 0x00,
  87.     /* M (77) */ 0x00, 0x00, 0x00, 0xC3, 0xE7, 0xFF, 0xFF, 0xDB, 0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0x00, 0x00, 0x00,
  88.     /* N (78) */ 0x00, 0x00, 0x00, 0xC6, 0xE6, 0xF6, 0xFE, 0xDE, 0xCE, 0xC6, 0xC6, 0xC6, 0xC6, 0x00, 0x00, 0x00,
  89.     /* O (79) */ 0x00, 0x00, 0x00, 0x7C, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0x7C, 0x00, 0x00, 0x00,
  90.     /* P (80) */ 0x00, 0x00, 0x00, 0xFC, 0x66, 0x66, 0x66, 0x7C, 0x60, 0x60, 0x60, 0x60, 0xF0, 0x00, 0x00, 0x00,
  91.     /* Q (81) */ 0x00, 0x00, 0x00, 0x7C, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xD6, 0xDE, 0x7C, 0x0C, 0x0E, 0x00,
  92.     /* R (82) */ 0x00, 0x00, 0x00, 0xFC, 0x66, 0x66, 0x66, 0x7C, 0x6C, 0x66, 0x66, 0x66, 0xE6, 0x00, 0x00, 0x00,
  93.     /* S (83) */ 0x00, 0x00, 0x00, 0x7C, 0xC6, 0xC6, 0x60, 0x38, 0x0C, 0x06, 0xC6, 0xC6, 0x7C, 0x00, 0x00, 0x00,
  94.     /* T (84) */ 0x00, 0x00, 0x00, 0xFF, 0xDB, 0x99, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3C, 0x00, 0x00, 0x00,
  95.     /* U (85) */ 0x00, 0x00, 0x00, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0x7C, 0x00, 0x00, 0x00,
  96.     /* V (86) */ 0x00, 0x00, 0x00, 0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0x66, 0x3C, 0x18, 0x00, 0x00, 0x00,
  97.     /* W (87) */ 0x00, 0x00, 0x00, 0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0xDB, 0xDB, 0xFF, 0x66, 0x66, 0x00, 0x00, 0x00,
  98.     /* X (88) */ 0x00, 0x00, 0x00, 0xC3, 0xC3, 0x66, 0x3C, 0x18, 0x18, 0x3C, 0x66, 0xC3, 0xC3, 0x00, 0x00, 0x00,
  99.     /* Y (89) */ 0x00, 0x00, 0x00, 0xC3, 0xC3, 0xC3, 0x66, 0x3C, 0x18, 0x18, 0x18, 0x18, 0x3C, 0x00, 0x00, 0x00,
  100.     /* Z (90) */ 0x00, 0x00, 0x00, 0xFF, 0xC3, 0x86, 0x0C, 0x18, 0x30, 0x60, 0xC1, 0xC3, 0xFF, 0x00, 0x00, 0x00,
  101.     /* [ (91) */ 0x00, 0x00, 0x00, 0x3C, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x3C, 0x00, 0x00, 0x00,
  102.     /* \ (92) */ 0x00, 0x00, 0x00, 0x00, 0x80, 0xC0, 0xE0, 0x70, 0x38, 0x1C, 0x0E, 0x06, 0x02, 0x00, 0x00, 0x00,
  103.     /* ] (93) */ 0x00, 0x00, 0x00, 0x3C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x3C, 0x00, 0x00, 0x00,
  104.     /* ^ (94) */ 0x00, 0x10, 0x38, 0x6C, 0xC6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  105.     /* _ (95) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0x00,
  106.     /* ` (96) */ 0x00, 0x30, 0x30, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  107.     /* a (97) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x78, 0x0C, 0x7C, 0xCC, 0xCC, 0xCC, 0x76, 0x00, 0x00, 0x00,
  108.     /* b (98) */ 0x00, 0x00, 0x00, 0xE0, 0x60, 0x60, 0x78, 0x6C, 0x66, 0x66, 0x66, 0x66, 0x7C, 0x00, 0x00, 0x00,
  109.     /* c (99) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7C, 0xC6, 0xC0, 0xC0, 0xC0, 0xC6, 0x7C, 0x00, 0x00, 0x00,
  110.     /* d (100) */ 0x00, 0x00, 0x00, 0x1C, 0x0C, 0x0C, 0x3C, 0x6C, 0xCC, 0xCC, 0xCC, 0xCC, 0x76, 0x00, 0x00, 0x00,
  111.     /* e (101) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7C, 0xC6, 0xFE, 0xC0, 0xC0, 0xC6, 0x7C, 0x00, 0x00, 0x00,
  112.     /* f (102) */ 0x00, 0x00, 0x00, 0x38, 0x6C, 0x64, 0x60, 0xF0, 0x60, 0x60, 0x60, 0x60, 0xF0, 0x00, 0x00, 0x00,
  113.     /* g (103) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x76, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0x7C, 0x0C, 0xCC, 0x78,
  114.     /* h (104) */ 0x00, 0x00, 0x00, 0xE0, 0x60, 0x60, 0x6C, 0x76, 0x66, 0x66, 0x66, 0x66, 0xE6, 0x00, 0x00, 0x00,
  115.     /* i (105) */ 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x38, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3C, 0x00, 0x00, 0x00,
  116.     /* j (106) */ 0x00, 0x00, 0x00, 0x06, 0x06, 0x00, 0x0E, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x66, 0x66, 0x3C,
  117.     /* k (107) */ 0x00, 0x00, 0x00, 0xE0, 0x60, 0x60, 0x66, 0x6C, 0x78, 0x78, 0x6C, 0x66, 0xE6, 0x00, 0x00, 0x00,
  118.     /* l (108) */ 0x00, 0x00, 0x00, 0x38, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3C, 0x00, 0x00, 0x00,
  119.     /* m (109) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xE6, 0xFF, 0xDB, 0xDB, 0xDB, 0xDB, 0xDB, 0x00, 0x00, 0x00,
  120.     /* n (110) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xDC, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x00, 0x00, 0x00,
  121.     /* o (111) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7C, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0x7C, 0x00, 0x00, 0x00,
  122.     /* p (112) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xDC, 0x66, 0x66, 0x66, 0x66, 0x66, 0x7C, 0x60, 0x60, 0xF0,
  123.     /* q (113) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x76, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0x7C, 0x0C, 0x0C, 0x1E,
  124.     /* r (114) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xDC, 0x76, 0x66, 0x60, 0x60, 0x60, 0xF0, 0x00, 0x00, 0x00,
  125.     /* s (115) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7C, 0xC6, 0x60, 0x38, 0x0C, 0xC6, 0x7C, 0x00, 0x00, 0x00,
  126.     /* t (116) */ 0x00, 0x00, 0x00, 0x10, 0x30, 0x30, 0xFC, 0x30, 0x30, 0x30, 0x30, 0x36, 0x1C, 0x00, 0x00, 0x00,
  127.     /* u (117) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0x76, 0x00, 0x00, 0x00,
  128.     /* v (118) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xC3, 0xC3, 0xC3, 0xC3, 0x66, 0x3C, 0x18, 0x00, 0x00, 0x00,
  129.     /* w (119) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xC3, 0xC3, 0xC3, 0xDB, 0xDB, 0xFF, 0x66, 0x00, 0x00, 0x00,
  130.     /* x (120) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xC3, 0x66, 0x3C, 0x18, 0x3C, 0x66, 0xC3, 0x00, 0x00, 0x00,
  131.     /* y (121) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0x7E, 0x06, 0x0C, 0xF8,
  132.     /* z (122) */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFE, 0xCC, 0x18, 0x30, 0x60, 0xC6, 0xFE, 0x00, 0x00, 0x00,
  133.     /* { (123) */ 0x00, 0x00, 0x00, 0x0E, 0x18, 0x18, 0x18, 0x70, 0x18, 0x18, 0x18, 0x18, 0x0E, 0x00, 0x00, 0x00,
  134.     /* | (124) */ 0x00, 0x00, 0x00, 0x18, 0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x18, 0x18, 0x18, 0x00, 0x00, 0x00,
  135.     /* } (125) */ 0x00, 0x00, 0x00, 0x70, 0x18, 0x18, 0x18, 0x0E, 0x18, 0x18, 0x18, 0x18, 0x70, 0x00, 0x00, 0x00,
  136.     /* ~ (126) */ 0x00, 0x00, 0x00, 0x76, 0xDC, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  137.         /* BLK(127)*/ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
  138. };
  139. // Routine to print a single character in one of 8 columns
  140. // Inputs:
  141. // x is one of (0,16,24,32,40,48,56),
  142. // y (0 to 16 or 24 depending upon font size),
  143. // n is either (0 to 9) or an ascii value,
  144. // font=0 for big font, 2 for small font,
  145. // inverse is true for an inverted character
  146. void drawChar(uint16_t x, uint16_t y, byte n, byte font, boolean inverse) {
  147.     byte charbytes[16], fontrows, xover8 = x>>3;
  148.     int index;
  149.     if (0 != (x % 8)) return;    // x not a multiple of 8
  150.     if ((n>9) && (n<32)) return; // invalid character
  151.     if (font==0) fontrows=16; else fontrows=8;
  152.     if ((n>=0) && (n<=9)) index=(n+16)*fontrows; else index=(n-32)*fontrows; // go to the right code for this character
  153.  
  154. // addressing start at buffer and add y (rows) * (WIDTH is 64 so WIDTH/8) is 8 plus (x / 8) is 0 to 7
  155.     byte *pDst = buffer + (y << 3) + xover8;
  156.     for (byte i=0;i<fontrows;i++) {  // fill up the charbytes array with the right bits
  157.       if (font==0) charbytes[i] = pgm_read_byte(&(font8x16_basic[index+i]));
  158.       // reverse bit order for fonts 0 and 1
  159.       if (font != 0) {
  160.         charbytes[i] = (charbytes[i] & 0xF0) >> 4 | (charbytes[i] & 0x0F) << 4;
  161.         charbytes[i] = (charbytes[i] & 0xCC) >> 2 | (charbytes[i] & 0x33) << 2;
  162.         charbytes[i] = (charbytes[i] & 0xAA) >> 1 | (charbytes[i] & 0x55) << 1;
  163.       };
  164.       if (inverse) charbytes[i] = ~charbytes[i];
  165.       };
  166.     const byte *pSrc = charbytes; // point at the first set of 8 pixels  
  167.     for (byte i=0; i<fontrows; i++) {
  168.         *pDst = *pSrc;     // populate the destination byte
  169.         pDst += 8;         // go to next row on buffer
  170.         pSrc++;            // go to next set of 8 pixels in character
  171.     }
  172. };
  173.  
  174. void moveLeft(byte pixels, byte rowstart, byte rowstop) { // routine to move certain rows on the screen "pixels" pixels to the left
  175. byte row, column;
  176. short unsigned int address;
  177.   for (column=0;column<8;column++) {
  178.     for (row=rowstart;row<rowstop;row++) {
  179.       address = (row<<3) + column; /// right here!
  180.       if (column==7)
  181.          buffer[address] = buffer[address]<<pixels; // shuffle pixels left on last column and fill with a blank
  182.         else {                // shuffle pixels left and add leftmost pixels from next column
  183.          byte incomingchar = buffer[address+1];
  184.          buffer[address] = buffer[address]<<pixels;
  185.          for (byte x=0;x<pixels;x++) { buffer[address] += ((incomingchar & (128>>x)) >> (7-x))<<(pixels-x-1); };
  186.          }
  187.      }
  188.   }
  189. };
  190.  
  191.  
  192.  
  193. void shiftOut(byte row) { // fast routine to shove out 8 columns into two rows via board's shift registers
  194.   for(byte column=0;column<8;column++) {
  195.     byte index = column + (row<<3);
  196.     for(byte i=0;i<8;i++) {  
  197.       PORTB &=~(3<<(data_R1-8));                                 // data_R2 is LOW; data_R1 is LOW;
  198.       PORTB &=~(1<<(clockPin-8));                                // digitalWrite(clockPin,LOW);
  199.       PORTB |= !((buffer[index]>>(7-i)) & 0x01) << (data_R1-8);  // top set of rows
  200.       PORTB |= !((buffer[index+128]>>(7-i)) & 0x01) << (data_R2-8); // bottom set of rows
  201.       PORTB |= 1<<(clockPin-8);                                  // digitalWrite(clockPin,HIGH);
  202.     };
  203.   };
  204. };
  205.  
  206. ISR(TIMER2_COMPA_vect){
  207.      cli();
  208.      digitalWrite(en_74138, HIGH);     // Turn off display
  209.      shiftOut(ScanRow);                // Shift out 8 columns
  210.      digitalWrite(latchPin, LOW);
  211.      digitalWrite(latchPin, HIGH);
  212.      PORTD = (ScanRow << 3) | (PORTD & 0X87); // Highlight row: pins 3 4 5 6 (la_74138 lb_74138 lc_74138 ld_74138)
  213.      digitalWrite(en_74138, LOW);     // Turn on display
  214.      ScanRow++;                       // Do the next pair of rows next time this routine is called
  215.      if (ScanRow==16) ScanRow=0;
  216.      sei();
  217. };
  218.  
  219. void setup() {
  220.  
  221. // Set up Timer2 as the scanning interrupt timer
  222.   cli(); // clear interrupts
  223.   TCCR2A = 0; TCCR2B = 0; TCNT2  = 0;
  224.   TCCR2B |= (1 << CS12) | (1 << CS10);     // Set 1024 prescaler
  225.                // 160Hz scan rate = 10 frames/second (16 pairs of rows)
  226.   OCR2A = 97;  // 97 = (16,000,000 / (1024*160)) - 1
  227.   TCCR2A |= (1 << WGM21); TIMSK2 |= (1 << OCIE2A);
  228.  
  229.   pinMode(latchPin,OUTPUT);  pinMode(clockPin,OUTPUT);
  230.   pinMode(data_R1,OUTPUT);   pinMode(data_R2,OUTPUT);
  231.    
  232.   pinMode(en_74138,OUTPUT);
  233.   pinMode(la_74138,OUTPUT);  pinMode(lb_74138,OUTPUT);
  234.   pinMode(lc_74138,OUTPUT);  pinMode(ld_74138,OUTPUT);
  235.  
  236.   digitalWrite(en_74138, LOW);
  237.   digitalWrite(data_R1, HIGH); digitalWrite(data_R2, HIGH);
  238.   counter = millis();
  239.   sei(); //allow interrupts
  240. };
  241.  
  242. void loop() {
  243. static int count=0;
  244.  
  245.  
  246.  
  247.  
  248.    
  249. // display next character of message
  250.     drawChar(56,0,message[count%(sizeof(message)-1)],0,false);
  251.     count = (count + 1);
  252.     // move the text 7 pixels (not 8 because it looks better) to the left
  253.     for (byte i=0; i<4; i++) {
  254.        delay(80);
  255.        moveLeft(2,1,32);
  256.     };
  257. };
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