How to send numbers from one Arduino to another using Serial

Projects Programming
17

I managed to get it working, the thing was the switch code for the received numbers as you said it...i rewrote the code and put everything in the last case, that worked.

like this:

#include <SD.h>
#include <Wire.h>
#include "Rtc.h"
#include <DHT22.h>



const char inicionumero = '<';
const char finnumero = '>';
char temperatura[10];
char humedad[10];
char polvo[10];
char temperatura2[10];
char humedad2[10];
char polvo2[10];
char datos[100];

float dustValenvio = 0.0;
float a = 0.0;
int dustPin=0;
float dustVal=0.0;
 
int ledPower=2;
int delayTime=280;
int delayTime2=40;
float offTime=9680;


enum { getTemperature, getHumedad, getDust };

int whichNumber = getTemperature;

float  temperature, humidity, dust;

#define DHT22_PIN 4

// Inicio de Setup DHT22
DHT22 myDHT22(DHT22_PIN);



float enviodatosT = 0;
float enviodatosH = 0;

const int chipSelect = 8;

char time[20];
char date[20];

Rtc rtc;


void setup ()
  { 
  Serial.begin (9600);
    pinMode(ledPower, OUTPUT);
    pinMode(10, OUTPUT);
    
    
     if (!SD.begin(chipSelect)) {
       return;
     }
  Rtc rtc = Rtc(0,0,0,1,1,1,11,0xAA);
  } 
  

void processNumber (const long n)
  {
  DHT22_ERROR_t errorCode;
  errorCode = myDHT22.readData();
  if(errorCode == DHT_ERROR_NONE)
  {
  enviodatosT = myDHT22.getTemperatureC()/1.0;
  enviodatosH = myDHT22.getHumidity()/1.0;
  }
  
  float x = n/100.0;  
  
  switch (whichNumber)
    {
    case getTemperature: 
      temperature = x;
      dtostrf(temperature,1,2,temperatura);
      strcpy(datos, temperatura);
      strcat(datos, ";");
      whichNumber = getHumedad;
      Serial.print ("Temperature = ");
      Serial.println(temperatura);
      break;
      
    case getHumedad: 
      humidity = x;
      dtostrf(humidity,1,2,humedad);
      strcat(datos, humedad);
      strcat(datos, ";");
      whichNumber = getDust;
      Serial.print ("Humidity = ");
      Serial.println(humedad);
      break;

    case getDust: 
      dust = x;
      dtostrf(dust,1,2,polvo);
      strcat(datos, polvo);
      strcat(datos, ";");
      whichNumber = getTemperature;
      Serial.print ("Dust = ");
      Serial.println(polvo);
           
                dtostrf(enviodatosT,1,2,temperatura2);
                dtostrf(enviodatosH,1,2,humedad2);
                strcat(datos, temperatura2);
                strcat(datos, ";");
                strcat(datos, humedad2);
                strcat(datos, ";");
                      digitalWrite(ledPower,LOW); // power on the LED
                      delayMicroseconds(delayTime);
                      dustVal=analogRead(dustPin); // read the dust value via pin 5 on the sensor
                      delayMicroseconds(delayTime2);
                      digitalWrite(ledPower,HIGH); // turn the LED off
                      delayMicroseconds(offTime);
                      if(dustVal<125)
                        {
                        dustValenvio = 0.0;
                        dtostrf(dustValenvio,1,2,polvo2);
                        }
                       else { 
                        a=(dustVal*5)/1023;
                        dustValenvio=(a-0.611)/5.1720;
                        dtostrf(dustValenvio,1,2,polvo2);
                           }
                  strcat(datos, polvo2);
                  strcat(datos, ";");
                  rtc.GetDate();
                  rtc.Time(time);
                  rtc.Date(date);
                  strcat(datos, date);
                  strcat(datos, ";");
                  strcat(datos, time);
     
                  File dataFile = SD.open("datalog.csv", FILE_WRITE);

                  // if the file is available, write to it:
                  if (dataFile) {
   
                  // write file
                  if(enviodatosT>0 && enviodatosH>0 && dustValenvio>0)
                    {
                      dataFile.println(datos);
                      dataFile.close();
                     }
                  }
      Serial.println(datos);
      delay(5000);
      break;
          }
          }  

void processInput ()
  {
  static float receivedNumber = 0;
  static boolean negative = false;
  
  byte c = Serial.read ();
  
  switch (c)
    {
      
    case finnumero:  
      if (negative) 
        processNumber (- receivedNumber); 
      else
        processNumber (receivedNumber); 

    // fall through to start a new number
    case inicionumero: 
      receivedNumber = 0; 
      negative = false;
      break;
      
    case '0' ... '9': 
      receivedNumber *= 10;
      receivedNumber += c - '0';
      break;
      
    case '-':
      negative = true;
      break;
      
    } 
  }  
 
void loop ()
  {
  
  if (Serial.available ())
  {
      processInput ();
        }   
              
  }

So again, thanks mr. Nick, im not so experienced in this stuff, but you always come with great ideas and patience, now my project is almost finished and that could not be achieved without your help.

greetings.

Ignacio.