const int ledPin = 12;
void setup(){
pinMode(ledPin, OUTPUT);
Serial.begin(9600);
}
void loop(){
if (Serial.available()) {
light(Serial.read() – ‘0’);
}
delay(500);
}
void light(int n){
for (int i = 0; i < n; i++) {
digitalWrite(ledPin, HIGH);
delay(100);
digitalWrite(ledPin, LOW);
delay(100);
}
}

by Oscar Liang

awesome little piece of code which thaught me how to setup connection by serial. yet one part I dont understand fully. Why does this line:

light(Serial.read() – ‘0’);

make the code run once, and this line an infinite times.

light(Serial.read());

has this something to do with binary? I dont get why substracting the string 0 would run the code once.

Thanks in Advance!

const int ledPin = 12;
void setup(){
pinMode(ledPin, OUTPUT);
Serial.begin(9600);
}
void loop(){
if (Serial.available()) {
light(Serial.read() – '0');
}
delay(500);
}
void light(int n){
for (int i = 0; i < n; i++) {
digitalWrite(ledPin, HIGH);
delay(100);
digitalWrite(ledPin, LOW);
delay(100);
}
}

by Oscar Liang

awesome little piece of code which taught me how to setup connection by serial. yet one part I don't understand fully. Why does this line:

light(Serial.read() – '0');

make the code run once, and this line an infinite times.

light(Serial.read());

has this something to do with binary? I don't get why subtracting the string 0 would run the code once.

Thanks in Advance!