아두이노랑 스마트폰을 블루투스를 통해 아두이노 시리얼 모니터에 뜨는 값을 스마트폰으로 전송시킬려고 합니다. 
  bt.write(Serial); 써서 받는게 아닌가요? 도움 부탁드립니다. 
#include <SoftwareSerial.h>
int En0 = 7;  //  Low enabled
int En1 = 6;  //  Low enabled
 
 
int S0  = 5;
int S1  = 4;
int S2  = 3;
int S3  = 2;
int blueTx=12;
int blueRx=13;
SoftwareSerial bt(blueTx,blueRx);
 
int SIG_pin = A4;
 
 
void setup() {
  Serial.begin(115200);
  bt.begin(115200);
  pinMode(En0, OUTPUT);
  pinMode(En1, OUTPUT);
 
  pinMode(S0, OUTPUT);
  pinMode(S1, OUTPUT);
  pinMode(S2, OUTPUT);
  pinMode(S3, OUTPUT);
 
}
 
void loop() { 
  
  for(int i = 0; i < 32; i ++){ 
    Serial.print(readMux(i));
 
    Serial.print(",");   
  }
  Serial.println(" ");  
  bt.write(Serial);
  delay(1000);
}
 
 
int readMux(int channel){
  int controlPin[] = {S0,S1,S2,S3,En0,En1};
 
  int muxChannel[32][6]={
    {0,0,0,0,0,1}, //channel 0
    {0,0,0,1,0,1}, //channel 1
    {0,0,1,0,0,1}, //channel 2
    {0,0,1,1,0,1}, //channel 3
    {0,1,0,0,0,1}, //channel 4
    {0,1,0,1,0,1}, //channel 5
    {0,1,1,0,0,1}, //channel 6
    {0,1,1,1,0,1}, //channel 7
    {1,0,0,0,0,1}, //channel 8
    {1,0,0,1,0,1}, //channel 9
    {1,0,1,0,0,1}, //channel 10
    {1,0,1,1,0,1}, //channel 11
    {1,1,0,0,0,1}, //channel 12
    {1,1,0,1,0,1}, //channel 13
    {1,1,1,0,0,1}, //channel 14
    {1,1,1,1,0,1}, //channel 15
    {0,0,0,0,1,0}, //channel 16
    {0,0,0,1,1,0}, //channel 17
    {0,0,1,0,1,0}, //channel 18
    {0,0,1,1,1,0}, //channel 19
    {0,1,0,0,1,0}, //channel 20
    {0,1,0,1,1,0}, //channel 21
    {0,1,1,0,1,0}, //channel 22
    {0,1,1,1,1,0}, //channel 23
    {1,0,0,0,1,0}, //channel 24
    {1,0,0,1,1,0}, //channel 25
    {1,0,1,0,1,0}, //channel 26
    {1,0,1,1,1,0}, //channel 27
    {1,1,0,0,1,0}, //channel 28
    {1,1,0,1,1,0}, //channel 29
    {1,1,1,0,1,0}, //channel 30
    {1,1,1,1,1,0}  //channel 31
  };
 
  //loop through the 6 sig
  for(int i = 0; i < 6; i ++){
    digitalWrite(controlPin[i], muxChannel[channel][i]);
  }
 
  //read the value at the SIG pin
  int val = analogRead(SIG_pin);
 
  //return the value
  return val;
}