How do I print different values through rf433 on receiver side? (Solved)

Projects Programming
1 
//Transmitter
#include <DHT.h>
#include <Adafruit_BMP085.h>
#include <Wire.h>  
#include <VirtualWire.h> 
 
// Definimos el pin digital donde se conecta el sensor
#define DHTPIN 8
// Dependiendo del tipo de sensor
#define DHTTYPE DHT11
 
// Inicializamos el sensor DHT11
DHT dht(DHTPIN, DHTTYPE);

Adafruit_BMP085 bmp;

const int LDRPin = A0; 
const int umbral = 100;
char msg0[3];
char msg1[3];
char msg2[3];
char msg3[3];
char msg4[3];
char msg5[3];
 
void setup() {
  // Inicializamos comunicación serie
  Serial.begin(9600);

  pinMode(LDRPin, INPUT);
  
  vw_set_tx_pin(12); 
  vw_setup(2000); // velocidad: Bits per segundo
  
  // Comenzamos el sensor DHT
  dht.begin();
  if (!bmp.begin()) {
  Serial.println("Could not find a valid BMP085 sensor, check wiring!");
  while (1) {}
  }
 
}
 
void loop() {
    // Esperamos 1 segundos entre medidas
  delay(1000);
  
  // Leemos la humedad relativa
  float h = dht.readHumidity();
  // Leemos la temperatura en grados centígrados (por defecto)
  float t = dht.readTemperature();
  // Leemos la temperatura en grados Fahreheit
  float f = dht.readTemperature(true);

  
 
  // Comprobamos si ha habido algún error en la lectura
  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println("Error obteniendo los datos del sensor DHT11");
    return;
  }
 
  // Calcular el índice de calor en Fahreheit
  float hif = dht.computeHeatIndex(f, h);
  // Calcular el índice de calor en grados centígrados
  float hic = dht.computeHeatIndex(t, h, false);

   // Leemos la cantidad de luz
  int input = analogRead(LDRPin);

 itoa(h, msg1, 10);                  // Converting humidity to an array of chars
 itoa(t, msg0, 10);                   // Converting the temperature to an array of chars  
 itoa(f, msg2, 10);
 itoa(hif, msg3, 10);
 itoa(hic, msg4, 10);
 itoa(input, msg5, 10);
 strcat(msg0, msg1);                    // Adding/joining the two arrays
 strcat(msg3, msg4); 
 strcat(msg2, msg5); 
 vw_send((uint8_t *)msg0, strlen(msg0)); // Sending the msg
 vw_send((uint8_t *)msg3, strlen(msg3));
 vw_send((uint8_t *)msg2, strlen(msg2));
 vw_wait_tx();                         // Wait for tx to finish
 
  
  Serial.print("Humedad: ");
  Serial.print(h);
  Serial.print(" %\t");
  Serial.println(" *F");
  
  Serial.print("Temperatura: ");
  Serial.print(t);
  Serial.print(" *C ");
  Serial.print(f);
  Serial.print(" *F\t");
  Serial.println(" *F");
  
  Serial.print("Indice de calor: ");
  Serial.print(hic);
  Serial.print(" *C ");
  Serial.print(hif);
  Serial.println(" *F");
  
  Serial.print("Presion = ");
  Serial.print(bmp.readPressure());
  Serial.println(" Pa"); 
  // Calculate altitude assuming 'standard' barometric
  // pressure of 1013.25 millibar = 101325 Pascal
  Serial.print("Altura = ");
  Serial.print(bmp.readAltitude());
  Serial.println(" metros");
  // you can get a more precise measurement of altitude
  Serial.print("Altura Real = ");
  Serial.print(bmp.readAltitude(101500));
  Serial.println(" metros");
 
  Serial.print("El valor de luz es: ");
  Serial.print(input);
  Serial.println();
  delay(500);
 
}

//Receiver
#include <Wire.h>                 
#include <LiquidCrystal.h> 
#include <VirtualWire.h> 

int tem = 0;
int i;
 
const int rs=13, en=8, d4=5, d5=4, d6=3, d7=2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
      
void setup() {
  
  Serial.begin(9600);
  Serial.println("Iniciando...");
  lcd.begin(16,2);
  lcd.clear();

  // Se inicializa el RF
  vw_set_rx_pin(11);
  vw_setup(2000);  // velocidad: Bits per segundo
  vw_rx_start();   // Se inicia como receptor   
}

void loop() {
 
 uint8_t buf[VW_MAX_MESSAGE_LEN];      // Variable to hold the received data
 uint8_t buflen = VW_MAX_MESSAGE_LEN;  // Variable to hold the length of the received data
 delay(1000);
 lcd.setCursor(0,0);  
 lcd.print("Temp: ");
 if (vw_get_message(buf, &buflen))    // If data is received
 {
   for (i=0;i<2;i++)               // Get the two first bytes
 {
 Serial.write(buf[i]);                // Debugging purpose
 lcd.write(buf[i]);                   // Write the first bytes on the LCD
 }  
 Serial.println();                    // Debugging purpose
 lcd.write(1);                        // Write the degree symbol on the LCD
 lcd.print(" C"); 
 lcd.setCursor(0,1);
 lcd.print("Hum:  "); 
   for (i=2;i<4;i++)              // Get the two last bytes
   {
     Serial.write(buf[i]);                // Debugging
     lcd.write(buf[i]);                    // Write the last bytes on the LCD
   }
 Serial.println();   
 lcd.print("% RH");      
 }
}

It only prints the last array sent by the transmitter, any help will be appreciate it!

2

If you send them as concatenated strings, how will you tell where each starts and stops is which at the other end?

Tx:

typedef struct 
 {
     float h;
     float t;
     float f;
 } PACKET;

PACKET packet;
packet.h = ....;
packet.t =....;
packet.f = ....;
vw_send((uint8_t *)packet, sizeof(packet));

Rx:

 typedef struct 
 {
     float h;
     float t;
     float f;
 } PACKET;

PACKET packet;
if (vw_get_message(packet, &buflen))
{
  Serial.println(packet.h);
  Serial.println(packet.t);
  Serial.println(packet.f);
}
3

Sorry, im still a bit lost this string/arrays subject is new to me. Where on my code should I add the typedef struct? Also I want to send hic, hif and input(from LDR sensor) to the receiver, since Im already receiving t and h.

Thank you!

4

caliael:
Sorry, im still a bit lost this string/arrays subject is new to me. Where on my code should I add the typedef struct? Also I want to send hic, hif and input(from LDR sensor) to the receiver, since Im already receiving t and h.

typedef struct usually goes at the top, like a global.
You can add extra fields to the struct if you want. It should be obvious how to do that.

5

Thank you

6 
PACKET packet;
packet.f = f;
packet.input = input;
packet.hic = hic;
packet.hif = hif;
vw_send((uint8_t *)packet, sizeof(packet));

invalid cast from type 'PACKET' to type 'uint8_t* {aka unsigned char*}'

I get this error when I compile.

7

This line in the receiver code guarantees that you will miss messages, and otherwise serves no useful purpose:

delay(1000);

Instead of

vw_send((uint8_t *)msg2, strlen(msg2));

I suggest

vw_send((uint8_t *)msg2, sizeof(msg2));

because that way, you preserve the zero terminating byte of the C-string, and can use C-string handling routines to decode the messages.

Even easier, send all the data in one message, created in one line of code, using snprintf().

8

My bad. Sorry. Try...

 vw_send((uint8_t *)&packet, sizeof(packet));
9

Thank you guys, I could solve the problem.