아두이노 10진수 > 2진수 변환해서 led에 나타내는법

LED는 ON, OFF 2가지 상태값 밖에 없으니 결국 2진수이죠. 16진수 입력도 9까지만 처리하면 10진수, 7까지만 처리하면 8진수 인거죠. 0-7까지이면 LED는 3개만 제어하면 되겠군요. 아래는 시리얼로 0-9, a-f를 입력받아 4개의 led에 이진수로 표현하는 예제이니 원하시는 코드가 포함되어 있습니다. 참고하셔요.

// named pin that connected led
int ledPin1 = 4;
int ledPin2 = 5;
int ledPin3 = 6;
int ledPin4 = 7;

// the setup routine runs once when you press reset:
void setup()
{
pinMode(ledPin1, OUTPUT);
pinMode(ledPin2, OUTPUT);
pinMode(ledPin3, OUTPUT);
pinMode(ledPin4, OUTPUT);

Serial.begin(9600);
Serial.println("type 0-9, or a-f than light led as hexa value");
Serial.println();
}

// the led_off_all light off all led
void led_off_all()
{
digitalWrite(ledPin1, LOW);
digitalWrite(ledPin2, LOW);
digitalWrite(ledPin3, LOW);
digitalWrite(ledPin4, LOW);
}

// the loop routine runs over and over again forever:
void loop()
{
if (Serial.available() > 0)
{
char thisChar = Serial.read();

if(thisChar == '0')
{
led_off_all();
Serial.println("This number is 0x00:0000");
Serial.println();
digitalWrite(ledPin1, LOW); // 0000
}
else if(thisChar == '1')
{
led_off_all();
Serial.println("This number is 0x01:0001");
Serial.println();
digitalWrite(ledPin1, HIGH); // 0001
}
else if(thisChar == '2')
{
led_off_all();
Serial.println("This number is 0x02:0020");
Serial.println();
digitalWrite(ledPin2, HIGH); // 0010
}
else if(thisChar == '3')
{
led_off_all();
Serial.println("This number is 0x03:0011");
Serial.println();
digitalWrite(ledPin1, HIGH); // 0011
digitalWrite(ledPin2, HIGH);
}
else if(thisChar=='4')
{
led_off_all();
Serial.println("This number is 0x04:0100");
Serial.println();
digitalWrite(ledPin3, HIGH); // 0100
}
else if(thisChar=='5')
{
led_off_all();
Serial.println("This number is 0x05:0101");
Serial.println();
digitalWrite(ledPin1, HIGH); // 0101
digitalWrite(ledPin3, HIGH);
}
else if(thisChar=='6')
{
led_off_all();
Serial.println("This number is 0x06:0110");
Serial.println();
digitalWrite(ledPin2, HIGH); // 0110
digitalWrite(ledPin3, HIGH);
}
else if(thisChar=='7')
{
led_off_all();
Serial.println("This number is 0x07:0111");
Serial.println();
digitalWrite(ledPin1, HIGH); // 0111
digitalWrite(ledPin2, HIGH);
digitalWrite(ledPin3, HIGH);
}
else if(thisChar=='8')
{
led_off_all();
Serial.println("This number is 0x08:1000");
Serial.println();
digitalWrite(ledPin4, HIGH); // 1000
}
else if(thisChar=='9')
{
led_off_all();
Serial.println("This number is 0x09:1001");
Serial.println();
digitalWrite(ledPin1, HIGH); // 1001
digitalWrite(ledPin4, HIGH);
}
else if(thisChar=='a')
{
led_off_all();
Serial.println("This number is 0x0a:1010");
Serial.println();
digitalWrite(ledPin2, HIGH); // 1010
digitalWrite(ledPin4, HIGH);
}
else if(thisChar=='b')
{
led_off_all();
Serial.println("This number is 0x0b:1011");
Serial.println();
digitalWrite(ledPin1, HIGH); // 1011
}
else if(thisChar=='c')
{
led_off_all();
Serial.println("This number is 0x0c:1100");
Serial.println();
digitalWrite(ledPin3, HIGH); // 1100
digitalWrite(ledPin4, HIGH);
}
else if(thisChar=='d')
{
led_off_all();
Serial.println("This number is 0x0d:1101");
Serial.println();
digitalWrite(ledPin1, HIGH); // 1101
digitalWrite(ledPin3, HIGH);
digitalWrite(ledPin4, HIGH);
}
else if(thisChar=='e')
{
led_off_all();
Serial.println("This number is 0x0e:1110");
Serial.println();
digitalWrite(ledPin2, HIGH); // 1110
digitalWrite(ledPin3, HIGH);
digitalWrite(ledPin4, HIGH);
}
else if(thisChar=='f')
{
led_off_all();
Serial.println("This number is 0x0f:1111");
Serial.println();
digitalWrite(ledPin1, HIGH); // 1111
digitalWrite(ledPin2, HIGH);
digitalWrite(ledPin3, HIGH);
digitalWrite(ledPin4, HIGH);
}
else
{
Serial.println("wrong input, try again~");
Serial.println();
}
}
}