#include <SoftwareSerial.h>

SoftwareSerial mySerial(8, 7); // RX, TX 
int prender;

void setup() {
  mySerial.begin(9600);
}

void loop() { 
prender=1;
mySerial.write(prender);
delay(2000);
prender=0;
mySerial.write(prender);
delay(2000);
}