seems o work on CT3 and not CT1

Submitted by Guest on Fri, 14/12/2012 - 19:45

Hi I use this code

#include "EmonLib.h" // Include Emon Library
#include "JeeLib.h"
EnergyMonitor ct1; // Create an instance

void setup()
{
//rf12_set_cs(8);
Serial.begin(9600);

ct1.currentTX(1, 111.1); // CT channel, calibration
}

void loop()
{
double Irms = ct1.calcIrms(1480);    // Calculate RMS current (1480: no. of samples)

Serial.print(Irms*240.0);           // Print to serial apparent power
Serial.print(" ");
Serial.println(Irms);               // Print to serial Irms
}

But I receive values look like true when I connect on CT3. But in the code normaly I used CT1. It run on leonardo, not yet with ethernetshield.

Any ideas?

Thx

Re: seems o work on CT3 and not CT1

Submitted by Robert Wall on Sat, 15/12/2012 - 01:49.

The library EmonLib.cpp contains the conversion from channel to pin number, which is correct only for the emonTx hardware:

   if (_channel == 1) inPinI = 3;
   if (_channel == 2) inPinI = 0;
   if (_channel == 3) inPinI = 1;

If you are using different I/O pins, it will not work. You must use the same I/O pins, or change your library.

Re: seems o work on CT3 and not CT1

Submitted by maxmax39@live.fr (not verified) on Sat, 15/12/2012 - 08:15.

Thanks for your answer, I find on EmonLib.cpp the conversion. So correct me if I am wrong. Like it s show on Port Map, I use CT1 ADC1. With this information, I have to change cpp like this if (_channel ==1) inPinI=1;

Correct?

Max

Port Map

Function	Arduino Port
9V AC sample	ADC0
CT 1-4	ADC 1-4
DS18B20 Temperature	Dig4
LED	Dig9
RFM12B SS	Dig10 (recommended) / Dig5
RFM12B INT	Dig3 Leonardo / Dig2 Uno

Re: seems o work on CT3 and not CT1

Submitted by Robert Wall on Sat, 15/12/2012 - 16:16.

If you have connected CT1 to ADC1, then yes. Only you know how you have wired it ;-)

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