problem wireless temprature

Using Arduino Networking, Protocols, and Devices
1

I am working on a project at school with arduino,
The intention is actually that we have to measure the temprature in different places and send it to 1centralle which then records everything.
The only thing I have problems with is the code itself. When I look at the sender through the adrenal program itself, I see that he is recording the temprature, but when I look at the receiver I only see 00 so he does not receive it. (probably this will be something stupid since I am a beginner with arduino)

hopefully someone can check my code and help me to get the errors out.
What I use for it:
arduino Nano as mother of the sensor
dht22 as a sensor
arduino due as central
nRF24L01 to send the data.

these are my sketches:

[Album] Schema's

codes:

Receiver:

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

#define DHTPIN 4  
#define DHTTYPE DHT22 

RF24 myRadio (7, 8);
byte address[][6] = {"00001"};
const int led_pin = 13;

struct package
{
  float temperature ;
  float humidity ;
};


typedef struct package Package;
Package data;

DHT dht(DHTPIN, DHTTYPE);

void setup()
{
    Serial.begin(9600);
    pinMode(led_pin, OUTPUT);
    dht.begin();
    myRadio.begin();  
    myRadio.setChannel(115); 
    myRadio.setPALevel(RF24_PA_MAX);
    myRadio.setDataRate( RF24_250KBPS ) ; 
    myRadio.openReadingPipe(0, address);
    myRadio.startListening();
}



void loop()
{
  if (myRadio.available()) {
     char text[32]= "";
     myRadio.read(&text, sizeof(text));
     Serial.println(text);
  }
}

transmitter

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

#define DHTPIN 4  
#define DHTTYPE DHT22 

RF24 myRadio (7, 8);
byte addresses[][6] = {"00001"};
const int led_pin = 13;

struct package
{
  float temperature ;
  float humidity ;
};


typedef struct package Package;
Package data;

DHT dht(DHTPIN, DHTTYPE);

void setup()
{
    Serial.begin(9600);
    pinMode(led_pin, OUTPUT);
    dht.begin();
    myRadio.begin();  
    myRadio.setChannel(115); 
    myRadio.setPALevel(RF24_PA_MAX);
    myRadio.setDataRate( RF24_250KBPS ) ; 
    myRadio.openWritingPipe( addresses[0]);
    delay(1000);
}



void loop()
{
  digitalWrite(led_pin, HIGH); // Flash a light to show transmitting
  readSensor();
  Serial.println(data.humidity);
  Serial.println(data.temperature);
  myRadio.write(&data, sizeof(data)); 
  digitalWrite(led_pin, LOW);
  delay(1000);
}

void readSensor()
{
 data.humidity = dht.readHumidity();
 data.temperature = dht.readTemperature();
 const char text[] = "dht.readTemperature()";
 myRadio.write(&text, sizeof(text));
 delay(1000);
}
2

When I look at the sender through the adrenal program itself, I see that he is recording the temprature

You lost me there. What is "the adrenal program" you are talking about?

Why does the transmitter program send two completely different kinds of packets, with no clue as to which is to be received?

The read() method on the receiver does NOT NULL terminate the array, so the result of the read is NOT a string, so you should NOT be passing that array to a function that expects a string.

3

Have a look at this Simple nRF24L01+ Tutorial.

Wireless problems can be very difficult to debug so get the wireless part working on its own before you start adding any other features.

The examples are as simple as I could make them and they have worked for other Forum members. If you get stuck it will be easier to help with code that I am familiar with. Start by getting the first example to work

...R

4

I do not know exactly what I put in that code, I've looked at many tutorials and was always unclear.

So therefore also the question if someone would want to help me with the code.

Robin thank you in advance for your reaction and your tutorial is very useful but I do not know how I then put that dht.

This is the first time that I make such a project, so experience starts from 0.
The problem is that I have a time limit for this project.
that is why I am asking this question on this forum.

5

Belgiumhacksmod:
Robin thank you in advance for your reaction and your tutorial is very useful but I do not know how I then put that dht.

Think of your program as having two separate parts - the wireless part and the DHT part.

Start by getting them working in two separate programs that each only does the one thing.

When you have the them both working it sill be straightforward to make a program that combines the two activities.

...R