SCT-013-030 current monitor sensor

[maglo18]

In Emonlib you have example to measure watt etc. without measure voltage.
https://github.com/openenergymonitor/EmonLib

[chatainsim]

@rvendrame Thanks, I will try this.
@maglo18 I will try to use some example.
First I need to check if my sketch and my assemble works at least.

Thanks for your help. I think I will need more from you guys !

[chatainsim]

Hello guys,

I've working on my sensor.
It's seems working, but I have some trouble with Watt or Kwh.

Here is the sketch:

// EmonLibrary examples openenergymonitor.org, Licence GNU GPL V3  ***/
#include <SPI.h>
#include <MySensor.h>  
#include "EmonLib.h"             // Include Emon Library
EnergyMonitor emon1;             // Create an instance
#define CHILD_ID 0 
MySensor gw;
unsigned long lastSend;
unsigned long SEND_FREQUENCY = 20000; // Minimum time between send (in milliseconds). We don't wnat to spam the gateway.

MyMessage IrmsMsg(CHILD_ID,V_WATT);
void setup()
{  
  gw.begin();

  // Send the sketch version information to the gateway and Controller
  gw.sendSketchInfo("Energy Meter", "1.0");

  // Register this device as power sensor
  gw.present(CHILD_ID, S_POWER);
  emon1.current(A0, 29.0);       // Current: input pin, calibration.
}

void loop()
{
  gw.process();
  unsigned long now = millis();
  double Irms = emon1.calcIrms(1480);
  //emon1.calcVI(20,2000);         // Calculate all. No.of half wavelengths (crossings), time-out
  //emon1.serialprint();           // Print out all variables (realpower, apparent power, Vrms, Irms, power factor)
  bool sendTime = now - lastSend > SEND_FREQUENCY;
  if (sendTime) { 
    //float Irms = emon1.Irms;             //extract Irms into Variable
    gw.send(IrmsMsg.set(Irms*232.0,1));
    Serial.println(Irms*232.0);
    lastSend = now;
  }
}

I've got around 390 for the Irms*232, do you thinks it's a correct value ?
Can I calculated the current kwh with the ampere ?

Thank you.

[chatainsim]

Hello,

I've made some change in the code :

// EmonLibrary examples openenergymonitor.org, Licence GNU GPL V3  ***/
#include <SPI.h>
#include <MySensor.h>  
#include "EmonLib.h"             // Include Emon Library
EnergyMonitor emon1;             // Create an instance
#define CHILD_ID_WATT 0
#define CHILD_ID_KWH 1
MySensor gw;
unsigned long lastSend;
unsigned long SEND_FREQUENCY = 20000; // Minimum time between send (in milliseconds). We don't wnat to spam the gateway.

MyMessage IrmsMsg(CHILD_ID_WATT,V_WATT);
MyMessage kWhMsg(CHILD_ID_KWH,V_KWH);
void setup()
{  
  gw.begin();
  gw.sendSketchInfo("Energy Meter", "1.0");  // Send the sketch version information to the gateway and Controller
  gw.present(CHILD_ID_WATT, S_POWER);  // Register this device as power sensor
  gw.present(CHILD_ID_KWH, S_POWER);
  emon1.current(A0, 29.0);       // Current: input pin, calibration.
}

void loop()
{
  gw.process();
  unsigned long now = millis();
  //emon1.serialprint();           // Print out all variables (realpower, apparent power, Vrms, Irms, power factor)
  double Irms = emon1.calcIrms(1480);
  bool sendTime = now - lastSend > SEND_FREQUENCY;
  if (sendTime) {
    gw.send(IrmsMsg.set((Irms*232.0)*1000, 1));
//    Serial.print("Watt: ");
//    Serial.println(Irms*232.0);
    gw.send(kWhMsg.set((Irms*232.0)/1000, 1));
//    Serial.print("kWH: ");
//    Serial.println((Irms*232.0)/1000);
    lastSend = now;
  }
}

But in Domoticz, I've two line for this but in kWh and not on in kWh and other in Watt :

Do you know why ?

Regards,

[AWI]

@chatainsim Domoticz does not have a different device for power (Watt) and energy(kWh) but combines them in a single device. What you need to do is send both the power and energy to the same child.

[chatainsim]

Thanks, but I've already test this and only the kWh is updated in domoticz, not watt.

// EmonLibrary examples openenergymonitor.org, Licence GNU GPL V3  ***/
#include <SPI.h>
#include <MySensor.h>  
#include "EmonLib.h"             // Include Emon Library
EnergyMonitor emon1;             // Create an instance
#define CHILD_ID 0
MySensor gw;
unsigned long lastSend;
unsigned long SEND_FREQUENCY = 20000; // Minimum time between send (in milliseconds). We don't wnat to spam the gateway.

MyMessage IrmsMsg(CHILD_ID,V_WATT);
MyMessage kWhMsg(CHILD_ID,V_KWH);
void setup()
{  
  gw.begin();
  gw.sendSketchInfo("Energy Meter", "1.0");  // Send the sketch version information to the gateway and Controller
  gw.present(CHILD_ID, S_POWER);  // Register this device as power sensor
  emon1.current(A0, 29.0);       // Current: input pin, calibration.
}

void loop()
{
  gw.process();
  unsigned long now = millis();
  //emon1.serialprint();           // Print out all variables (realpower, apparent power, Vrms, Irms, power factor)
  double Irms = emon1.calcIrms(1480);
  bool sendTime = now - lastSend > SEND_FREQUENCY;
  if (sendTime) {
    gw.send(IrmsMsg.set((Irms*232.0)*1000, 1));
//    Serial.print("Watt: ");
//    Serial.println(Irms*232.0);
    gw.send(kWhMsg.set((Irms*232.0)/1000, 1));
//    Serial.print("kWH: ");
//    Serial.println((Irms*232.0)/1000);
    lastSend = now;
  }
}

Can you help me with this ?

Thanks

[AWI]

@chatainsim I am pretty sure it is a combined device which shows Watt only when added ...:

Although I am not sure if the Domoticz MySensors plug-in handles it right (I'm still using my own script).

[chatainsim]

Ok, thanks.
How do you get your watt info ? With teleinfo ?

[AWI]

@chatainsim
I send the V_Watt messages from the Power meter to Domoticz.

[chatainsim]

@AWI

MyMessage IrmsMsg(CHILD_ID,V_WATT);
MyMessage kWhMsg(CHILD_ID,V_KWH);

I also send both data but it's seems that Domoticz is ingnoring it !
I don't know why.

[AWI]

@chatainsim Sounds you like you need to consult the Domoticz forum. The Domoticz code shows that is interpreted.

case V_WATT:
		{
			_tMySensorSensor *pSensorKwh = FindSensor(pSensor->nodeID, V_KWH);
			if (pSensorKwh) {
				SendKwhMeter(pSensorKwh->nodeID, pSensorKwh->childID, pSensorKwh->batValue, pSensor->floatValue / 1000.0f, pSensorKwh->floatValue, "Meter");
			}
			else {
				_tUsageMeter umeter;
				umeter.id1 = 0;
				umeter.id2 = 0;
				umeter.id3 = 0;
				umeter.id4 = pSensor->nodeID;
				umeter.dunit = pSensor->childID;
				umeter.fusage = pSensor->floatValue/1000.0f;
				sDecodeRXMessage(this, (const unsigned char *)&umeter);
			}
		}
		break;
	case V_KWH:
		{
			_tMySensorSensor *pSensorWatt = FindSensor(pSensor->nodeID, V_WATT);
			if (pSensorWatt) {
				SendKwhMeter(pSensor->nodeID, pSensor->childID, pSensor->batValue, pSensorWatt->floatValue / 1000.0f, pSensor->floatValue, "Meter");
			}
			else {
				SendKwhMeter(pSensor->nodeID, pSensor->childID, pSensor->batValue, 0, pSensor->floatValue, "Meter");
			}
		}
		break;```

[ewgor]

Does anyone have some OpenHab items and rules for @chatainsim sketch posted above? I have a SCT-013-000 can anyone help me use it in my project?
Thanks!

[ewgor]

Hello, anybody can help me here?
What I want to do is to get the instant watt or kW read from my SCT013000 and to get also the kWh from a certain date, let's say fro first of this month!
Any idea will be kindly appreciated!
I'm using openhanb to display info and I'll need some rules for this!
Thanks all!

[ewgor]

Nobody here?

[5546dug]

I have got this to work on my Cdn system 120/240 vac using A0 and A1 pins. The code needed to be changed to address our voltage and another clamp added., but I do have a few questions;

1. Is there a way I can record or view amps consumed in the vera dashboard?

2. I used the sketch above displayed by @chatainsim and in it there are two lines of code with values 29.0 and second 1480 both in green and in brackets. For the life of me I can not find an explanation of these or how the values were arrived at. Can anyone help with explanation?

     gw.present(CHILD_ID, S_POWER);
     emon1.current(A0, 29.0);       // Current: input pin, calibration.
     }
   
     void loop()
    {
    gw.process();
    unsigned long now = millis();
    double Irms = emon1.calcIrms(1480);
   

3. Is there a method to show current in phase. I tried presenting CHILD_ID, S_MULTIMETER and MyMessage IrmsMsg(CHILD_ID,V_CURRENT); but got nowhere.

4. There is/was much running up and down stairs from electrical panel to computer and back is OTA IDE what I think it might be-- firmware or sketches can be updated over the air from my computer>vera>gw>node while not needing to access the node? If so there is much learning for me to do.

5. Using arduino 1.6.5, Lib 1.4.1, vera 3/veralite, ui5, Ethernet g/w , win 8.1, pro mini clone

[A Former User]

Hello, last week i buy SCT013-30 (ebay.fr) and follow this topic for have powermeter with mysensors. I need only energy (kWh) and power (W) same my OWL sensors (use with domoticz controler)
I modifie the sketch from mysensors/pulse powermeter (http://www.mysensors.org/build/pulse_power)

// EmonLibrary examples openenergymonitor.org, Licence GNU GPL V3  ***/
#include <SPI.h>
#include <MySensor.h>  
#include "EmonLib.h"             // Include Emon Library
EnergyMonitor emon1;             // Create an instance
#define CHILD_ID 0 
#define PIN_ANALOG_I A2
MySensor gw;
unsigned long lastSend;
unsigned long lastSend2;
unsigned long SEND_FREQUENCY = 90000; // Minimum time between send (in milliseconds).
unsigned long SEND_FREQUENCY2 = SEND_FREQUENCY / 25;
int index = 0;
double Irms=0;
double power;
boolean pcReceived = false;
double nrj=0, old_nrj;
MyMessage IrmsMsg(CHILD_ID,V_WATT);
MyMessage kWhMsg(CHILD_ID,V_KWH);
MyMessage pcMsg(CHILD_ID,V_VAR1);


void incomingMessage(const MyMessage &message) 
{
  if (message.type==V_VAR1) 
  {  
    nrj = old_nrj = message.getLong();
    Serial.print("Received last nrj count from gw:");
    Serial.println(nrj);
    pcReceived = true;
  }
}

void setup()
{  
  gw.begin(incomingMessage);
  gw.sendSketchInfo("Energy Meter", "1.0");  // Send the sketch version information to the gateway and Controller
  gw.present(CHILD_ID, S_POWER);   // Register this device as power sensor
  gw.request(CHILD_ID, V_VAR1);
  emon1.current(PIN_ANALOG_I, 30.0);       // Current: input pin, calibration.
}

void loop()
{
  gw.process(); 
  unsigned long now = millis();
  unsigned long now2 = millis();
  bool sendTime2 = now2 - lastSend2 > SEND_FREQUENCY2;
  if (sendTime2) //calcul Irms moy
  {
    if (index==0) Irms=emon1.calcIrms(1480);
    else {
    index++;
    Irms = (index*Irms+emon1.calcIrms(1480))/(index+1);
    }
    lastSend2 = now2;
  }
  bool sendTime = now - lastSend > SEND_FREQUENCY;
  if (sendTime && pcReceived) 
  { 
    power = Irms*232.0;
    gw.send(IrmsMsg.set(power,1));
    Serial.println(Irms*232.0);
    nrj += (power*SEND_FREQUENCY/1000)/3.6E6;
    gw.send(kWhMsg.set(nrj,3));
    lastSend = now;
    index = 0;
    old_nrj=nrj;
  }
 else if (sendTime && !pcReceived)
 {
  gw.request(CHILD_ID, V_VAR1);
  lastSend=now;
 }
}

it seems that it works for now (but not optimal).

Note 1) my cosphy=1 because i use only ampere clamp, i cant measure the phase between curent i and tension v.
2) my calibration constant (used in emonlib) is 30
3) Sorry for my english :disappointed: - Je suis français.

[oudini]

Hello,
The cos phi applies only to the three-phase, single phase not

Je suis français aussi...

[fredok]

Hello, if i remember physics course in university Power P=u.i and energy E=integrale(Pdt)=integrale(u.i.dt)=UeffxIeffxcos(phi)
but for particular citizen same me, energy provider non consider cos(phi)

So, i correct my last sketch for request last nrj value to the gw.

// EmonLibrary examples openenergymonitor.org, Licence GNU GPL V3  ***/
#include <SPI.h>
#include <MySensor.h>  
#include "EmonLib.h"             // Include Emon Library
EnergyMonitor emon1;             // Create an instance
#define CHILD_ID 0 
#define PIN_ANALOG_I A2
MySensor gw;
unsigned long lastSend;
unsigned long lastSend2;
unsigned long SEND_FREQUENCY = 20000; // Minimum time between send (in milliseconds). We don't wnat to spam the gateway.
unsigned long SEND_FREQUENCY2 = SEND_FREQUENCY / 25;
int index = 0;
double Irms=0;
double power;
boolean pcReceived = false;
boolean onyva=true;
float nrj=0, old_nrj;
MyMessage IrmsMsg(CHILD_ID,V_WATT);
MyMessage kWhMsg(CHILD_ID,V_KWH);
MyMessage pcMsg(CHILD_ID,V_VAR1);


void incomingMessage(const MyMessage &message) 
{
  if (message.type==V_VAR1) 
  {  
    nrj = old_nrj = message.getFloat();
    Serial.print("Received last nrj count from gw:");
    Serial.println(nrj);
    pcReceived = true;
  }
}

void setup()
{  
  gw.begin(incomingMessage);
  gw.sendSketchInfo("Energy Meter", "1.0");  // Send the sketch version information to the gateway and Controller
  gw.present(CHILD_ID, S_POWER);   // Register this device as power sensor
  gw.request(CHILD_ID, V_VAR1);
  emon1.current(PIN_ANALOG_I, 30.0);       // Current: input pin, calibration.
}

void loop()
{
  if (onyva) gw.process();
  onyva = false; 
  unsigned long now = millis();
  //unsigned long now2 = millis();
  bool sendTime2 = now - lastSend2 > SEND_FREQUENCY2;
  if (sendTime2) //calcul Irms moy
  {
    if (index==0) Irms=emon1.calcIrms(1480);
    else {
    index++;
    Irms = (index*Irms+emon1.calcIrms(1480))/(index+1);
    }
    lastSend2 = now;
  }
  bool sendTime = now - lastSend > SEND_FREQUENCY;
  if (sendTime && pcReceived) 
  { 
    power = Irms*232.0;
    gw.send(IrmsMsg.set(power,1));
    Serial.println(Irms*232.0);
    nrj += (power*SEND_FREQUENCY/1000)/3.6E6;
    gw.send(kWhMsg.set(nrj,5));
    gw.send(pcMsg.set(nrj,5));
    lastSend = now;
    index = 0;
    old_nrj=nrj;
    onyva=true;
  }
 else if (sendTime && !pcReceived)
 {
  gw.request(CHILD_ID, V_VAR1);
  lastSend=now;
  index=0;
  onyva=true;
 }
}

thx...

[maciejka]

Hi, I'm beginner of arduino programmer. Can You explain a little this sketch? What for You use "SEND_FREQUENCY2 = SEND_FREQUENCY / 25;" ? Why You using two if statements sendTime2 and sendTime ?

Thanks
Maciej

[fredok]

Sorry, I'm late debause i come back holiday today
This sketch send Power and energy (kWh) every Sendfrequency=90s but the sketch not measure power every 90s but everyre 90/25=3,6s and send to the GW the mean power (Pmean)
this is calculate here :
if (index==0) Irms=emon1.calcIrms(1480);
else {
index++;
Irms = (index*Irms+emon1.calcIrms(1480))/(index+1);
}
lastSend2 = now;