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- /*
- * Show messages on an 8x8 led matrix,
- * scrolling from right to left.
- *
- * Uses FrequencyTimer2 library to
- * constantly run an interrupt routine
- * at a specified frequency. This
- * refreshes the display without the
- * main loop having to do anything.
- *
- */
- #include <FrequencyTimer2.h>
- #define SPACE { \
- {0, 0, 0, 0, 0, 0, 0, 0}, \
- {0, 0, 0, 0, 0, 0, 0, 0}, \
- {0, 0, 0, 0, 0, 0, 0, 0}, \
- {0, 0, 0, 0, 0, 0, 0, 0}, \
- {0, 0, 0, 0, 0, 0, 0, 0}, \
- {0, 0, 0, 0, 0, 0, 0, 0}, \
- {0, 0, 0, 0, 0, 0, 0, 0}, \
- {0, 0, 0, 0, 0, 0, 0, 0} \
- }
- #define H { \
- {0, 1, 0, 0, 0, 0, 1, 0}, \
- {0, 1, 0, 0, 0, 0, 1, 0}, \
- {0, 1, 0, 0, 0, 0, 1, 0}, \
- {0, 1, 1, 1, 1, 1, 1, 0}, \
- {0, 1, 0, 0, 0, 0, 1, 0}, \
- {0, 1, 0, 0, 0, 0, 1, 0}, \
- {0, 1, 0, 0, 0, 0, 1, 0}, \
- {0, 1, 0, 0, 0, 0, 1, 0} \
- }
- #define E { \
- {0, 1, 1, 1, 1, 1, 1, 0}, \
- {0, 1, 0, 0, 0, 0, 0, 0}, \
- {0, 1, 0, 0, 0, 0, 0, 0}, \
- {0, 1, 1, 1, 1, 1, 1, 0}, \
- {0, 1, 0, 0, 0, 0, 0, 0}, \
- {0, 1, 0, 0, 0, 0, 0, 0}, \
- {0, 1, 0, 0, 0, 0, 0, 0}, \
- {0, 1, 1, 1, 1, 1, 1, 0} \
- }
- #define L { \
- {0, 1, 0, 0, 0, 0, 0, 0}, \
- {0, 1, 0, 0, 0, 0, 0, 0}, \
- {0, 1, 0, 0, 0, 0, 0, 0}, \
- {0, 1, 0, 0, 0, 0, 0, 0}, \
- {0, 1, 0, 0, 0, 0, 0, 0}, \
- {0, 1, 0, 0, 0, 0, 0, 0}, \
- {0, 1, 0, 0, 0, 0, 0, 0}, \
- {0, 1, 1, 1, 1, 1, 1, 0} \
- }
- #define O { \
- {0, 0, 0, 1, 1, 0, 0, 0}, \
- {0, 0, 1, 0, 0, 1, 0, 0}, \
- {0, 1, 0, 0, 0, 0, 1, 0}, \
- {0, 1, 0, 0, 0, 0, 1, 0}, \
- {0, 1, 0, 0, 0, 0, 1, 0}, \
- {0, 1, 0, 0, 0, 0, 1, 0}, \
- {0, 0, 1, 0, 0, 1, 0, 0}, \
- {0, 0, 0, 1, 1, 0, 0, 0} \
- }
- byte analogPin = 5;
- byte col = 0;
- byte leds[8][8];
- // pin[xx] on led matrix connected to nn on Arduino (-1 is dummy to make array start at pos 1)
- int pins[17]= {-1, 5, 4, 3, 2, 14, 15, 16, 17, 13, 12, 11, 10, 9, 8, 7, 6};
- // col[xx] of leds = pin yy on led matrix
- int cols[8] = {pins[13], pins[3], pins[4], pins[10], pins[06], pins[11], pins[15], pins[16]};
- // row[xx] of leds = pin yy on led matrix
- int rows[8] = {pins[9], pins[14], pins[8], pins[12], pins[1], pins[7], pins[2], pins[5]};
- const int numPatterns = 6;
- byte patterns[numPatterns][8][8] = {
- H,E,L,L,O,SPACE
- };
- int pattern = 0;
- void setup() {
- // sets the pins as output
- for (int i = 1; i <= 16; i++) {
- pinMode(pins[i], OUTPUT);
- }
- // set up cols and rows
- for (int i = 1; i <= 8; i++) {
- digitalWrite(cols[i - 1], LOW);
- }
- for (int i = 1; i <= 8; i++) {
- digitalWrite(rows[i - 1], LOW);
- }
- clearLeds();
- // Turn off toggling of pin 11
- FrequencyTimer2::disable();
- // Set refresh rate (interrupt timeout period)
- FrequencyTimer2::setPeriod(2000);
- // Set interrupt routine to be called
- FrequencyTimer2::setOnOverflow(display);
- setPattern(pattern);
- }
- void loop() {
- pattern = ++pattern % numPatterns;
- slidePattern(pattern, 60);
- }
- void clearLeds() {
- // Clear display array
- for (int i = 0; i < 8; i++) {
- for (int j = 0; j < 8; j++) {
- leds[i][j] = 0;
- }
- }
- }
- void setPattern(int pattern) {
- for (int i = 0; i < 8; i++) {
- for (int j = 0; j < 8; j++) {
- leds[i][j] = patterns[pattern][i][j];
- }
- }
- }
- void slidePattern(int pattern, int del) {
- for (int l = 0; l < 8; l++) {
- for (int i = 0; i < 7; i++) {
- for (int j = 0; j < 8; j++) {
- leds[j][i] = leds[j][i+1];
- }
- }
- for (int j = 0; j < 8; j++) {
- leds[j][7] = patterns[pattern][j][0 + l];
- }
- delay(del);
- }
- }
- // Interrupt routine
- void display() {
- digitalWrite(cols[col], LOW); // Turn whole previous column off
- col++;
- if (col == 8) {
- col = 0;
- }
- for (int row = 0; row < 8; row++) {
- if (leds[col][7 - row] == 1) {
- digitalWrite(rows[row], LOW); // Turn on this led
- }
- else {
- digitalWrite(rows[row], HIGH); // Turn off this led
- }
- }
- digitalWrite(cols[col], HIGH); // Turn whole column on at once (for equal lighting times)
- delayMicroseconds(900); // Delay so that on times are longer than off time = brighter leds
- }
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