// Pins connect as per define
// Fill in the pins you used on your own setup.

#define ROW_0 25
#define ROW_1 24
#define ROW_2 23
#define ROW_3 22

#define COL_0 37
#define COL_1 36
#define COL_2 35
#define COL_3 34
#define COL_4 33
#define COL_5 32
#define COL_6 31
#define COL_7 30

const byte rows[] = {
    ROW_0, ROW_1, ROW_2, ROW_3
};



void setup() {

    
    pinMode(25, OUTPUT);
    pinMode(24, OUTPUT);
    pinMode(23, OUTPUT);
    pinMode(22, OUTPUT);
    pinMode(37, OUTPUT);
    pinMode(36, OUTPUT);
    pinMode(35, OUTPUT);
    pinMode(34, OUTPUT);
    pinMode(33, OUTPUT);
    pinMode(32, OUTPUT);
    pinMode(31, OUTPUT);
    pinMode(30, OUTPUT);

    digitalWrite (COL_0,LOW);
    digitalWrite (COL_1,LOW);
    digitalWrite (COL_2,LOW);
    digitalWrite (COL_3,LOW);
    digitalWrite (COL_4,LOW);
    digitalWrite (COL_5,LOW);
    digitalWrite (COL_6,LOW);
    digitalWrite (COL_7,LOW);
}

void loop() { 
 
digitalWrite (ROW_0,HIGH);
digitalWrite (ROW_1,LOW);
digitalWrite (ROW_2,LOW);
digitalWrite (ROW_3,LOW);

delay(100);

digitalWrite (ROW_0,LOW);
digitalWrite (ROW_1,HIGH);
digitalWrite (ROW_2,LOW);
digitalWrite (ROW_3,LOW);

delay(100); 

digitalWrite (ROW_0,LOW);
digitalWrite (ROW_1,LOW);
digitalWrite (ROW_2,HIGH);
digitalWrite (ROW_3,LOW);

delay(100); 

digitalWrite (ROW_0,LOW);
digitalWrite (ROW_1,LOW);
digitalWrite (ROW_2,LOW);
digitalWrite (ROW_3,HIGH);

delay(100);


}