void setup() { 
pinMode(2, OUTPUT); 
pinMode(3, OUTPUT); 
pinMode(4, OUTPUT); 
pinMode(5, OUTPUT); 
pinMode(6, OUTPUT); 
pinMode(7, OUTPUT); 
pinMode(8, OUTPUT); 
// pinMode(9, OUTPUT); 
// digitalWrite(9, 0); // start with the "dot" off 
Serial.begin(9600); 
} 
void loop() { 
// write '0' 
Serial.println("0\n"); 
digitalWrite(2, 0); 
digitalWrite(3, 0); 
digitalWrite(4, 0); 
digitalWrite(5, 0); 
digitalWrite(6, 0); 
digitalWrite(7, 0); 
digitalWrite(8, 1); 
delay(500); 
// write '2' 
Serial.println("2\n"); 
digitalWrite(2, 0); 
digitalWrite(3, 0); 
digitalWrite(4, 1); 
digitalWrite(5, 0); 
digitalWrite(6, 0); 
digitalWrite(7, 1); 
digitalWrite(8, 0); 
delay(500); 
// write '3' 
Serial.println("3\n"); 
digitalWrite(2, 0); 
digitalWrite(3, 0); 
digitalWrite(4, 0); 
digitalWrite(5, 0); 
digitalWrite(6, 1); 
digitalWrite(7, 1); 
digitalWrite(8, 0); 
delay(500); }