RF q n funciona

const int rfPin = A0;
const int rfTransmitPin = 4;
int led = 13;
int inty;
bool rf_on=true;
bool rf_print=true;
float sensorValue=0;
int RF=0;
String RF_Sinal="0";
int RF_play=false;
int RF_c=2;
bool RF_led=false;
int delayRF=1;

void setup() {
 Serial.begin(250000);
 pinMode(led,OUTPUT);
 pinMode(rfTransmitPin, OUTPUT);
}

void loop() {
  sensorValue= analogRead(rfPin);

  //Serial.print("Voltage output = ");
  //Serial.println(sensorValue*5/1023);
  if(rf_on){
    RF=(sensorValue*5/1023);
    RF_Sinal=(RF_Sinal+String(RF));
    Serial.println(RF_Sinal);
    //delay(50);
  }
  if(RF_Sinal.length()==100 & rf_on){
    //Serial.print("Characers:");
    //Serial.print(String(RF_Sinal[2])+String(RF_Sinal[3])+String(RF_Sinal[4]));
    rf_on=false;
    RF_play=true;
    Serial.println("");
    Serial.println("RF = "+RF_Sinal);
    Serial.println("INIT...");
  }
  if(RF_play){
    //digitalWrite(led, HIGH);
    Serial.println(delayRF);
    if(RF_c <= 100){
      //Serial.println("<=100");
      //Serial.println(RF_c+" = "+RF_Sinal[3]);
      //Serial.println(RF_Sinal[RF_c]);
      //digitalWrite(rfTransmitPin, HIGH);
    if(String(RF_Sinal[RF_c])=="2" or String(RF_Sinal[RF_c])=="1"){
      Serial.println("RF_Sinal ON");
      digitalWrite(rfTransmitPin, HIGH);
      //digitalWrite(led, HIGH);
      delay(delayRF);
      RF_c++;
    }if(String(RF_Sinal[RF_c])=="0"){
      Serial.println("RF_Sinal OFF");
      digitalWrite(rfTransmitPin, LOW);
      //digitalWrite(led, LOW);
      delay(delayRF);
      RF_c++;
    }else{
      RF_c=2;
      delayRF++;
    }
   }
 }
 if(rfTransmitPin==HIGH){
  digitalWrite(led, HIGH);
 }else{
  digitalWrite(led, LOW);
 }

  if (sensorValue > 1000){
    inty++;
  }else{
    inty=0;
  }
  if(inty >= 4){
    //digitalWrite(led,HIGH);
  }else{
    //digitalWrite(led,LOW);
  }/*
  if(RF==2){
    digitalWrite(rfTransmitPin, HIGH);
  }else{
    digitalWrite(rfTransmitPin, LOW);
  }*/
  //delay(50);
}