IR센서가 값을 읽어온 후 색을 판별했을 때 검은색이고 LED(rd)가 켜졌으면 signalviolation변수값을 1씩 증가시키고 싶은데 조건문안에서 변수값 증가가 되지 않고, 시리얼 모니터에도 그 값이 뜨지 않습니다. 무엇이 문제인건가요
const char BLACK = 0;
const char WHITE = 1;
int r1=D3, r2=D9, rd=D6;
int yd=D7;
int g1=D12, g2=D10, gd=D8;
int IRsensor;
int signalviolation=0;
int color;
int bluetoothTx=D4;
int bluetoothRx=D5;
SoftwareSerial bluetooth(bluetoothTx, bluetoothRx);
void setup() {
  
  pinMode(r1, OUTPUT); pinMode(r2, OUTPUT); pinMode(rd, OUTPUT);
  pinMode(yd, OUTPUT);
  pinMode(g1, OUTPUT); pinMode(g2, OUTPUT); pinMode(gd, OUTPUT);
  digitalWrite(r1, LOW); digitalWrite(r2, LOW); digitalWrite(rd, LOW);
  digitalWrite(yd, LOW);
  digitalWrite(g1, LOW); digitalWrite(g2, LOW); digitalWrite(gd, LOW);
  Serial.begin(9600);
  bluetooth.begin(9600);
  
}
void loop() {
  char cmd;
  char read_data;
  int ir;
  if(bluetooth.available()){
    cmd=char(bluetooth.read());
    //낮일 때
    if(cmd=='1'){
      day();
      readSensors();
      ir=colorFinder(IRsensor);
      if((ir==0)&&(digitalRead(rd==HIGH))) {
        signalviolation++;
        Serial.println(signalviolation);
        
        
    }
    else if(cmd=='2') {
      dawn();
    }
  }
  if(Serial.available()) {
    read_data=(char)Serial.read();
    if(read_data == '3') {
      digitalWrite(r1, LOW); digitalWrite(r2, LOW); digitalWrite(rd, HIGH);
      digitalWrite(yd, LOW);
      digitalWrite(g1, LOW); digitalWrite(g2, HIGH); digitalWrite(gd, LOW);
      Serial.println("traffic light on");
    }
    delay(10);
  }
}
void day() {
  digitalWrite(r1, HIGH);
  digitalWrite(r2, HIGH);
  digitalWrite(gd, HIGH);
  delay(3000);
  digitalWrite(gd, LOW);
  digitalWrite(yd, HIGH);
  delay(3000);
  digitalWrite(r1, LOW);
  digitalWrite(r2, LOW);
  digitalWrite(yd, LOW);
  digitalWrite(g1, HIGH);
  digitalWrite(g2, HIGH);
  digitalWrite(rd, HIGH);
}
void dawn() {
      digitalWrite(r1, LOW); digitalWrite(r2, LOW); digitalWrite(rd, LOW);
      digitalWrite(g1, LOW); digitalWrite(g2, LOW); digitalWrite(gd, LOW);
      digitalWrite(yd, LOW);
      digitalWrite(yd, HIGH);
}
void readSensors() {
  const int OFFSET = 1024;
  IRsensor = 1024-analogRead(A0);
}
char colorFinder(int sensorValue){
  char color;
  const int threshold = 860;  //검정색과 흰색의 경계값 860
  if (sensorValue < threshold)
  color = WHITE;
  else
  color = BLACK;
  return color; 
}