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I need help in a college job


#1

Hello, i’m doing a college job and I need show a value of current sensor in my smart phone. For this i’m using Blynk to make app. My problem is that I can not show the data read by the sensor in Blynk, can anyone help me?

I’m using Arduino MEGA 2560 - Bluetooth Communication.

My code:

#define BLYNK_PRINT Serial

#include <BlynkSimpleSerialBLE.h>
#include <SoftwareSerial.h>
#include "EmonLib.h" //sensor de corrente
#include <Ultrasonic.h> // sensor ultrassonico
#include <EEPROM.h>


char buf; // ultrassonico
unsigned short flag = 0; //flag para armazenar valor anterior do sensor ultrasonico


#define pino_trigger 4 // ultrassonico
#define pino_echo 5 // ultrassonico

Ultrasonic ultrasonic(pino_trigger, pino_echo);
EnergyMonitor emon1; // corrente

//Tensao da rede eletrica
int rede = 127.0;
 
//Pino do sensor SCT
int pino_sct = A0;

//variaveis para contar tempo
double timems=0, time_ant=0, time_atual=0, tempo = 0;

//variaveis para calculo de kwh
double kwtotal=0;
double Irms = 0;

char auth[] = "cbd0eb8743e74c6c993552b0b9df1ef3";

SoftwareSerial SerialBLE(10, 11); // RX, TX

BlynkTimer timer;

void corrente()
{
  Blynk.virtualWrite(V0, Irms);
}
void potenciaInsta()
{
  Blynk.virtualWrite(V1, Irms*rede/1000);
}

void potenciaTotal()
{
  Blynk.virtualWrite(V2, kwtotal);
}

void gastoRede()
{
  Blynk.virtualWrite(V3,kwtotal*0.78063);
}
void setup() {
 //Define o pino 7 como saida
  pinMode(7, OUTPUT);//saida do relé
  pinMode(13, OUTPUT);
  Serial.begin(9600);
  SerialBLE.begin(9600);
  Blynk.begin(SerialBLE,auth);
  Serial.println("Lendo dados do sensor");  
    
  //Pino, calibracao - Cur Const= Ratio/BurdenR. 1800/62 = 29. 
  emon1.current(pino_sct, 16); // calibração corrente com o multimetro
  
  timer.setInterval(1000L, corrente);
  timer.setInterval(1000L, potenciaInsta);
  timer.setInterval(1000L, potenciaTotal);
  timer.setInterval(1000L, gastoRede);
}

void loop() {

  Blynk.run();
  timer.run();
  
  long microsec = ultrasonic.timing();
  float cmMsec, inMsec;
 
  time_atual = millis() - time_ant;
  time_ant = time_ant + time_atual;
  
  Irms = emon1.calcIrms(1480); //calcula Irms

  kwtotal = kwtotal + (double)Irms*rede*(time_atual/3600E6); //total de kw consumido
  
  //sensor ultrasonico
  cmMsec = ultrasonic.convert(microsec, Ultrasonic::CM);
  //inMsec = ultrasonic.convert(microsec, Ultrasonic::IN);
  //Serial.print("Distancia em cm: ");
  //Serial.print(cmMsec);
  //Serial.print(" - Distancia em polegadas: ");
  //Serial.println(inMsec);
  
  //Mostra o valor da corrente
  Serial.print("Corrente: ");
  Serial.print(Irms);
  
  //Calcula e mostra o valor da potencia
  Serial.print(" Potencia: ");
  Serial.println(Irms*rede);

  //mostra o valor de kw instantaneo
  Serial.print(" Kw instantaneo: ");
  Serial.println(Irms*rede/1000,10); // 3600E3

  //mostra o total de kwh consumido
  Serial.print(" Kwh total consumido: ");
  Serial.println(kwtotal,10);

  //mostra o valor em reais
  Serial.print("Valor da conta atual: R$");
  Serial.println(kwtotal*0.78063191,10); // valor do Kwh da conta de energia

  //mostra o valor de kwh total estipulado para um mês
  Serial.print(" Kwh total estipulado para 30 dias: ");
  Serial.println((Irms*rede*720)/1000);     //valor de kwh atual vezes 720horas de 30dias
  Serial.println(time_atual);
  
  if(cmMsec <20) //seta flag dizendo que foi menor que 20cm
  {
       flag = 1;   
  }

  if(cmMsec >30 && flag==1) //se for maior que 30 e sensor foi acionado anteriormente
  {
    digitalWrite(13, !digitalRead(13)); //inverte estado do led
    flag = 0;  //limpa flag  
  }

  delay(10000);
}

#2

Do colleges stop teaching how to read directions?

I formatted your code as required and stated in both the Welcome Topic and in the templaye test you needed to erase when posting your topic.

Blynk - FTFC


#3

And speaking of directions… your void loop() is not Blynk friendly…

Look at the Avoiding the Void part in particular…

And this is BAD! with Blynk, particularly in the loop.


#4

Ok, i remove the delay and i’m read the Avoid Void, but i’m not print in void loop(). You say my void loop() is no Blynk friendly, how I do this?


#5

By reading the suggested document, and the many others in the Help Center :wink:

Use timed functions and keep the loop clear of everything but the basics… as stated in the document link above…

void loop() {
  Blynk.run();
  timer.run();
}

#6

Thank you man, this link help me so much xD.

I finish my project thanks.