mini weather station (Nano, nrf24, bme280 and lcd16*2)

Projects Programming
1

Hello everyone
Im trying to build a mini weather station. I am using a Nano as a transmitter, with the BME280 sensor connectted and a NRF24L01.
The serial monitor of the transmitter shows me the right values of the 4 mesurements(temp, humidity, pressure and altitude) and it seems it works fine
The receiver works with a Nano too. It has connected a NRF24L01 and a LCD16*2. Although the 2 devices are communicating something is wrong.
The receiver is getting the right values for the temperature and the humidity but the pressure and the altitude are wrong . The transmitter is has for pressure 945.75hPa and 577.7m for altitude but the receiver gets 177hPa for pressure and 63m for altitude. Can anyone help?
I paste the code for the transmitter and receiver:

//TRANSMITTER
#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>

const uint64_t pipeOut = 0xE8E8F0F0E1LL;
#define SEALEVELPRESSURE_HPA (1013.25)

Adafruit_BME280 bme;

RF24 radio(9, 10); //  CN and CSN  pins of nrf
struct MyData {
  byte h;
  byte t;
  byte p;
  byte a;
};
MyData data;

void setup()
{
  Serial.begin(9600);
  radio.begin();
  radio.setAutoAck(false);
  radio.setDataRate(RF24_250KBPS);
  radio.openWritingPipe(pipeOut);

  if (!bme.begin(0x76)) {
    Serial.println("Could not find a valid BME280 sensor, check wiring!");
    while (1);
  }
}

void loop() 
{

  
  
  Serial.print("T = ");
  Serial.print(bme.readTemperature());
  Serial.println("*C");

  Serial.print("P = ");
  Serial.print(bme.readPressure() / 100.0F);
  Serial.println("hPa");

  Serial.print("A = ");
  Serial.print(bme.readAltitude(SEALEVELPRESSURE_HPA));
  Serial.println("m");

  Serial.print("H = ");
  Serial.print(bme.readHumidity());
  Serial.println("%");

  Serial.println();
  
  data.h = bme.readHumidity();
  data.t = bme.readTemperature();
  data.p = bme.readPressure() / 100.0F;
  data.a = bme.readAltitude(SEALEVELPRESSURE_HPA);
  
  radio.write(&data, sizeof(MyData));
  
}

//RECEIVER

#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x3F, 16, 2);

const uint64_t pipeIn = 0xE8E8F0F0E1LL; 

RF24 radio(9, 10);
struct MyData {
  byte h;
  byte t;
  byte p;
  byte a;
};
MyData data;

void setup()
{
  Serial.begin(9600); 
  radio.begin();
  lcd.begin();
  lcd.home();
  lcd.backlight();
  lcd.clear();
  radio.setAutoAck(false);
  radio.setDataRate(RF24_250KBPS);
  radio.openReadingPipe(1, pipeIn);
  radio.startListening();
  //lcd.println("Receiver ");
}


void loop()
{
  if ( radio.available() ) {
    radio.read(&data, sizeof(MyData));
    }    
   
  Serial.print("H: ");
  Serial.print(data.h);
  lcd.setCursor(0,0);
  lcd.print("H:"); 
  lcd.print(data.h);
  lcd.print("%");
  Serial.print(" P: ");
  Serial.print(data.p);
  lcd.print(" P:"); 
  lcd.print(data.p);
  lcd.print("hPa");
  lcd.setCursor(0,1);
  Serial.print("T: ");
  Serial.print(data.t);
  lcd.print("T:");
  lcd.print(data.t);
  lcd.print("C"); 
  Serial.print("A:");
  Serial.print(data.a);
  lcd.print(" A:");
  lcd.print(data.a);
  lcd.print("m");
     
  //Serial.print("\n");
}

Thanks a lot for your time

2 
struct MyData {
  byte h;
  byte t;
  byte p;
  byte a;
};

Those values are not byte values.

3

TheMemberFormerlyKnownAsAWOL:

struct MyData {

byte h;
 byte t;
 byte p;
 byte a;
};



Those values are not byte values.

Yes you are right...I change it to "float" and it seems to work fine.Thank you very much

4

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