#include <SoftwareSerial.h>;
SoftwareSerial mySerial(PB4, PB3);
void setup() {
  // put your setup code here, to run once:
  mySerial.begin(9600);
  pinMode (PB0, OUTPUT);
  digitalWrite(PB0, 1);
}

void loop() {
  // put your main code here, to run repeatedly:
  char a = 'b';
  mySerial.println(a);
  digitalWrite(PB0, 0);
  delay(1);
  digitalWrite(PB0, 1);
  delay (100);

}