#define ROW_1 2 #define ROW_2 3 #define ROW_3 4 #define ROW_4 5 #define ROW_5 6 #define ROW_6 7 #define ROW_7 8 #define ROW_8 9 #define COL_1 10 #define COL_2 11 #define COL_3 12 #define COL_4 13 #define COL_5 A0 #define COL_6 A1 #define COL_7 A2 #define COL_8 A3 const byte rows[] = { ROW_1, ROW_2, ROW_3, ROW_4, ROW_5, ROW_6, ROW_7, ROW_8 }; // The display buffer // It's prefilled with a smiling face (1 = ON, 0 = OFF) byte face1[] = {B00000000,B01000010,B10100101,B01000010,B00000000,B00011000,B00100100,B00011000}; byte face2[] = {B00000000,B01000010,B10100101,B01000010,B00000000,B00111100,B01000010,B00111100}; byte face3[] = {B00000000,B01000010,B10100101,B01000010,B00000000,B00011000,B01100110,B00011000}; byte face4[] = {B01000010,B10100101,B00000000,B01000010,B00000000,B00000000,B01000010,B00111100}; float timeCount = 0; void setup() { // Open serial port Serial.begin(9600); // Set all used pins to OUTPUT // This is very important! If the pins are set to input // the display will be very dim. for (byte i = 2; i <= 13; i++) pinMode(i, OUTPUT); pinMode(A0, OUTPUT); pinMode(A1, OUTPUT); pinMode(A2, OUTPUT); pinMode(A3, OUTPUT); } void loop() { // This could be rewritten to not use a delay, which would make it appear brighter delay(1); timeCount += 1; if(timeCount < 200) { drawScreen(face1); } else if (timeCount < 230) { drawScreen(face2); } else if (timeCount < 260) { drawScreen(face3); } else if (timeCount < 290) { drawScreen(face4); } else if (timeCount < 600) { // } else if (timeCount < 630) { // nothing } else if (timeCount < 800) { // } else if (timeCount < 830) { // nothing } else if (timeCount < 1000) { // } else if (timeCount < 1030) { // nothing } else if (timeCount < 1200) { // } else if (timeCount < 1230) { // nothing } else { // back to the start timeCount = 0; } } void drawScreen(byte buffer2[]){ // Turn on each row in series for (byte i = 0; i < 8; i++) { setColumns(buffer2[i]); // Set columns for this specific row digitalWrite(rows[i], HIGH); delay(2); // Set this to 50 or 100 if you want to see the multiplexing effect! digitalWrite(rows[i], LOW); } } void setColumns(byte b) { digitalWrite(COL_1, (~b >> 0) & 0x01); // Get the 1st bit: 10000000 digitalWrite(COL_2, (~b >> 1) & 0x01); // Get the 2nd bit: 01000000 digitalWrite(COL_3, (~b >> 2) & 0x01); // Get the 3rd bit: 00100000 digitalWrite(COL_4, (~b >> 3) & 0x01); // Get the 4th bit: 00010000 digitalWrite(COL_5, (~b >> 4) & 0x01); // Get the 5th bit: 00001000 digitalWrite(COL_6, (~b >> 5) & 0x01); // Get the 6th bit: 00000100 digitalWrite(COL_7, (~b >> 6) & 0x01); // Get the 7th bit: 00000010 digitalWrite(COL_8, (~b >> 7) & 0x01); // Get the 8th bit: 00000001 // If the polarity of your matrix is the opposite of mine // remove all the '~' above. }