Transmitter nFR40L21

#include <SPI.h>
#include "nRF24L01.h"
#include "RF24.h"

const int trigPin=5;
const int echoPin=6;
//int distance;
long duration;

float distance;

RF24 radio(7, 8);
const uint64_t pipes[3] = { 0xF0F0F0F0E1LL, 0xF0F0F0F0E2LL, 0xF0F0F0F0E3LL };

void setup(void) {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  Serial.begin(9600);
 radio.begin();
radio.setDataRate(RF24_250KBPS);
radio.openWritingPipe(pipes[1]);
radio.startListening();

}

void loop(void) {
  // put your main code here, to run repeatedly:
  digitalWrite(trigPin, LOW);
  delayMicroseconds(8);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(8);
  digitalWrite(trigPin, LOW);
  delayMicroseconds(8);

  duration= pulseIn(echoPin, HIGH);  // menerima suara ultrasonic
  distance= (duration/2) / 29.1;     // mengubah durasi menjadi jarak (cm)
  Serial.println(distance);        // menampilkan jarak pada Serial Monitor
memset(&distance,' ',sizeof(distance));
radio.write(&distance, sizeof(distance));
delay(10);
}