#define INA 9
#define INB 8
#define ldrPin A0
#define ntcPin A1

int ldrStatus = 0;
int ntcStatus = 0;


void setup()
{
  Serial.begin(9600);
  pinMode(ntcPin, INPUT);
  pinMode(ldrPin, INPUT);
  pinMode(INA,    OUTPUT);
  pinMode(INB,    OUTPUT);
}

void loop()
{

  ldrStatus = analogRead(ldrPin);
  ntcStatus = analogRead(ntcPin);
  Serial.print(ldrStatus);
  Serial.print("  ");
  Serial.println(ntcStatus);

  if (ldrStatus > 800) {
    if (ntcStatus > 500) {
      BTH();//Back
    }
    else {
      FTH();//Front
    }
  }
  else {
    stopM();//STOP
  }
  delay(100);
}

void BTH() {
  digitalWrite(INA, LOW);
  digitalWrite(INB, HIGH);
  delay(10);
}

void FTH() {
  digitalWrite(INA, HIGH);
  digitalWrite(INB, LOW);
  delay(10);
}

void stopM() {
  digitalWrite(INA, LOW);
  digitalWrite(INB, LOW);
  delay(10);
}