#include <SoftwareSerial.h>

SoftwareSerial mySerial(0, 1); // RX, TX 
int prender;

void setup() {
  mySerial.begin(9600);
  pinMode(7, OUTPUT);
}

void loop() { 

prender=mySerial.read();

if (prender==1){
  digitalWrite(7,HIGH);
}
if (prender==0){
  digitalWrite(7,LOW);
}
}