void setup(){
Serial.begin(9600);
for (int i=4; i<=7; i++){
pinMode(i,OUTPUT);
}
}
int quotient = 0;
int x = 0;
void loop(){
function1();
encode();
}
void function1(){
x = x+16*millis()/100;
quotient = x%16;
}
void function2(){
x = millis()/50;
if (x%2==0) quotient=15*(millis()%50)/50;
else quotient = 15*(1-(millis()%50)/50);
}
void encode(){
for (int i=4; i<=7, i++){
digitalWrite(i,quotient%2);
quotient = quotient/2;
}
}