 
 #include <SPI.h>
 
+#include <printf.h>
 #include <nRF24L01.h>
 #include <RF24.h>
 #include <RF24_config.h>

int PIPE = 0x7272727069;

void setup() {
  // Serial.begin(9600);
  radio = new RF24(10, 9);
  radio->begin();
  delay(1000);

  radio->setPALevel(RF24_PA_MAX);

  radio->openWritingPipe(PIPE);
  radio->printDetails();
  attachInterrupt(0, handleInterrupt, CHANGE);
}

