problem with the hc-sr04 with nrf240l01

Projects Programming
1

when i tried to combine ultrasonic, the output from serial monitor is zero. either problem with my coding.?for tx code

#include <SPI.h>
#include <Mirf.h>
#include <nRF24L01.h>
#include <MirfHardwareSpiDriver.h>
#define trigPin 5
#define echoPin 4
int rate, duration;
long previousMillis = 0; 
long interval = 1000;
void setup(){

  Serial.begin(9600);
  Mirf.spi = &MirfHardwareSpi;
  Mirf.init();
  Mirf.setRADDR((byte *)"clie1");
  Mirf.payload = sizeof(rate);
  Mirf.config();
}

void loop(){
  unsigned long currentMillis = millis();
  if(currentMillis - previousMillis > interval) {
    previousMillis = currentMillis; 

    digitalWrite (trigPin, HIGH);
    delayMicroseconds (1000);
    digitalWrite (trigPin, LOW);
    duration = pulseIn (echoPin, LOW);
    rate = (duration/2) / 29.1;
    Serial.print(rate);
    delay (500) ;
    Mirf.setTADDR((byte *)"serv1");

    Mirf.send((byte *) &rate);

    while(Mirf.isSending()){
    }
  }
}

and here is my rx code

#include <Mirf.h>
#include <MirfHardwareSpiDriver.h>
#include <MirfSpiDriver.h>
#include <nRF24L01.h>
#include <SPI.h>


int rate;

void setup(){

  Serial.begin(9600);

  Mirf.spi = &MirfHardwareSpi;
  Mirf.init();
  Mirf.setRADDR((byte *)"serv1");
  Mirf.payload = sizeof(rate);
  Mirf.config();
}

void loop(){

  while(!Mirf.dataReady()){
  }
  Mirf.getData((byte *) &rate);
  Serial.print("range of the distance");
  Serial.print(rate);
  Serial.println("cm");
  delay(100);
}
2

:slight_smile: :slight_smile: :slight_smile:
thanks for you
because of you I can finish also NRF2401L + HCSR04.
code for your connections are correct and the data sent . but the code for your ultrasonic sensors are still wrong . so the distance is sent is " 0 " . for that I perfected using the library NewPing and it worked.

TRANSMITTER

#include <SPI.h>
#include <Mirf.h>
#include <nRF24L01.h>
#include <MirfHardwareSpiDriver.h>
#include <NewPing.h>

#define TRIGGER_PIN 6
#define ECHO_PIN 5
#define MAX_DISTANCE 200

int rate;
long previousMillis = 0;
long interval = 1000;

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);

void setup(){

  Serial.begin(9600);
  
  Mirf.cePin = 8;
  Mirf.csnPin = 7;
  Mirf.spi = &MirfHardwareSpi;
  Mirf.init();
  
  Mirf.channel = 0;
  Mirf.payload = sizeof(rate);
  Mirf.config();
  
  Mirf.setTADDR((byte *)"nrf01"); // Le 2eme module va envoyer ses info au 1er module
  Mirf.setRADDR((byte *)"nrf02"); 
}

void loop(){
  unsigned long currentMillis = millis();
  if(currentMillis - previousMillis > interval)
  previousMillis = currentMillis;
  
    rate = sonar.ping_cm();
    Serial.print(rate);
    delay (100) ;
    
    Mirf.send((byte *) &rate);
    while(Mirf.isSending()){
    }
  }

RECEIVER

#include <Mirf.h>
#include <MirfHardwareSpiDriver.h>
#include <MirfSpiDriver.h>
#include <nRF24L01.h>
#include <SPI.h>

int rate;

void setup(){

  Serial.begin(9600);

  Mirf.cePin = 8;
  Mirf.csnPin = 7;
  Mirf.spi = &MirfHardwareSpi;
  Mirf.init();
  
  Mirf.channel = 0;
  Mirf.payload = sizeof(rate);
  Mirf.config();
  
  Mirf.setTADDR((byte *)"nrf02");
  Mirf.setRADDR((byte *)"nrf01");
}

void loop(){

  while(!Mirf.dataReady()){
  }
  Mirf.getData((byte *) &rate);
  Serial.print("range of the distance");
  Serial.print(rate);
  Serial.println("cm");
  delay(100);
}

thank you very much!