Coding problem

Hardware
1

Hello and good evening

i want to ask about the coding…

the problem i faced rightnow is the current value. when connecting to IoT platform, the value of the current is always zero. but when i compile the sketch without the IoT coding, it can reading the value of current. what is the problem actually?

here is my coding with the IoT… the IoT plateform i use is ThingSpeak

 #include <ESP8266WiFi.h>  
 #include <WiFiClient.h>  
 #include <ThingSpeak.h>  
 #include"EmonLib.h"
EnergyMonitor emon1;;
int Power;
int energy;
float total, kWhUsed;
float TotalkWhUsed;

 const char* ssid = "Redmi3s";  
 const char* password = "xxxxxxxxxxx";  
 WiFiClient client;  
 unsigned long myChannelNumber = 470287;  
 const char * myWriteAPIKey = "XXXXXXXXXXXXXXXX";  
 uint8_t Irms, power, totalkWhUsed, k=0, l=0, m=0;  
 void setup()  
 {  
  Serial.begin(115200);  
  
  delay(10);  
  // Connect to WiFi network  
  Serial.println();  
  Serial.println();  
  Serial.print("Connecting to ");  
  Serial.println(ssid);  
  WiFi.begin(ssid, password);  
  while (WiFi.status() != WL_CONNECTED)  
  {  
   delay(500);  
   Serial.print(".");  
  }  
  Serial.println("");  
  Serial.println("WiFi connected");  
  // Print the IP address  
  Serial.println(WiFi.localIP());  
  ThingSpeak.begin(client);  
 }  
 void loop()   
 {  
  static boolean data_state = false;  
        
  long milisec = millis();
  long time = milisec/1000;
  double Irms = emon1.calcIrms(1480);  // Calculate Irms only
  power = (Irms*240.0);         // Apparent power
  totalkWhUsed = ((power*time))/(3600);     //TotalkWhUsed = TotalkWhUsed + kWhUsed;
  
  Serial.print("Irms                        ");
  Serial.println(Irms);          // Irms
  delay(2000);
  Serial.print("power                       ");
  Serial.println(Power);
  delay(2000);
  Serial.print("totalkWhUsed                 ");
 Serial.println(totalkWhUsed);
 Serial.print("\n\n");
 delay(2000);

 k=Irms;
 l=power;
 m=totalkWhUsed;
  // Write to ThingSpeak. There are up to 8 fields in a channel, allowing you to store up to 8 different  
  // pieces of information in a channel. Here, we write to field 1.  

  if( data_state )  
  {  
   ThingSpeak.writeField(myChannelNumber, 1, k, myWriteAPIKey);  
 
   ThingSpeak.writeField(myChannelNumber, 2, l, myWriteAPIKey);  
   data_state = false;
  }   
  else
  {
    ThingSpeak.writeField(myChannelNumber, 3, m, myWriteAPIKey);
    data_state = true;  
  }
  delay(1000); // ThingSpeak will only accept updates every 15 seconds.  
 }
2

I don’t know ThingSpeak, but there are two obvious problems:

What is the value of current? You are assigning a double to an integer in k=Irms;, so any value less than 1.0 will be truncated to zero. (And likewise 1.0 - 1.999 will become 1, etc.)

Also, beware that you have Irms declared twice, once globally and once inside loop( ) - and those are two different variables!

3

In addition to the errors pointed out above, the delay should be 15000 vice 1000.

4

And in addition to all of that, power is defined as uint8_t which means the biggest value it can hold is 255. I suspect this line of code:

power = (Irms*240.0); // Apparent power

will be doing a lot of overflowing.

5

all right… thank you !