AC Analog conversion for UNO

Re: AC Analog conversion for UNO

Submitted by TrystanLea on Thu, 19/04/2012 - 08:12.

See here: http://openenergymonitor.org/emon/buildingblocks/ct-sensors-interface We have gone along the route of calculating true rms on the arduino itself.

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Re: AC Analog conversion for UNO

Submitted by markbeal2 on Thu, 19/04/2012 - 13:15.

Thanks Trystan, I have build a voltage input circuit but the sketch is throwing up problems as errors below.

voltage_and_current_ex.cpp.o: In function `loop':
C:\DOCUME~1\MARK~1.BEA\LOCALS~1\Temp\build2352948031508961507.tmp/voltage_and_current_ex.cpp:17: undefined reference to `EnergyMonitor::calcVI(int, int)'
C:\DOCUME~1\MARK~1.BEA\LOCALS~1\Temp\build2352948031508961507.tmp/voltage_and_current_ex.cpp:18: undefined reference to `EnergyMonitor::serialprint()'
voltage_and_current_ex.cpp.o: In function `setup':
C:\DOCUME~1\MARK~1.BEA\LOCALS~1\Temp\build2352948031508961507.tmp/voltage_and_current_ex.cpp:11: undefined reference to `EnergyMonitor::voltage(int, double, double)'
C:\DOCUME~1\MARK~1.BEA\LOCALS~1\Temp\build2352948031508961507.tmp/voltage_and_current_ex.cpp:12: undefined reference to `EnergyMonitor::current(int, double)'

Any Ideas, I'm a little green with this.

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Re: AC Analog conversion for UNO

Submitted by markbeal2 on Thu, 19/04/2012 - 17:53.

I can't seem to get the sketch to compile Trystan. Errors are as follows.

voltage_and_current_ex.cpp.o: In function `loop':

C:\Users\Mark\AppData\Local\Temp\build6210930148339193694.tmp/voltage_and_current_ex.cpp:17: undefined reference to `EnergyMonitor::calcVI(int, int)'

C:\Users\Mark\AppData\Local\Temp\build6210930148339193694.tmp/voltage_and_current_ex.cpp:18: undefined reference to `EnergyMonitor::serialprint()'

voltage_and_current_ex.cpp.o: In function `setup':

C:\Users\Mark\AppData\Local\Temp\build6210930148339193694.tmp/voltage_and_current_ex.cpp:11: undefined reference to `EnergyMonitor::voltage(int, double, double)'

C:\Users\Mark\AppData\Local\Temp\build6210930148339193694.tmp/voltage_and_current_ex.cpp:12: undefined reference to `EnergyMonitor::current(int, double)'

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Re: AC Analog conversion for UNO

Submitted by markbeal2 on Fri, 20/04/2012 - 17:07.

Can anyone help with this? I am not seeing something here in the example script. I want to get my immersion heater device finish then I can post it on here.

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Re: AC Analog conversion for UNO

Submitted by markbeal2 on Sat, 21/04/2012 - 08:51.

It seems that I am stuck out on a limb here, tried my hardest to workout what is wrong with the sample sketch here http://openenergymonitor.org/emon/buildingblocks/ct-sensors-interface.

I have put the emon lib in but still keeps coming up with error "undefined reference to `EnergyMonitor::current(int, double)' for voltage and current. Please help someone.

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Re: AC Analog conversion for UNO

Submitted by prensel (not verified) on Sat, 21/04/2012 - 17:44.

Maybe silly question but did you copy the EmonLib directory into the libraries directory of Arduino ?

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Re: AC Analog conversion for UNO

Submitted by markbeal2 on Sat, 21/04/2012 - 18:08.

Yes I have done that prensel; with all the post regarding the example others seem to get it working ok. I'm just learning about the Arduino and have carried out what is said but it throws the fore mentioned errors on compile.I've tried messaging Trystan but have no reply as yet. I'm not one for throwing the towel in but i'm getting very frustrated with the sketch. Thanks for your reply anyway.

Mark.

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Re: AC Analog conversion for UNO

Submitted by Lloyd on Sat, 21/04/2012 - 18:24.

Another simple question - did you restart arduino after copying the libraries into place?

Lloyd

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Re: AC Analog conversion for UNO

Submitted by markbeal2 on Sat, 21/04/2012 - 18:46.

Yes Lloyd I have done that.

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Re: AC Analog conversion for UNO

Submitted by markbeal2 on Sat, 21/04/2012 - 19:02.

This is the sketch..............

#include "EmonLib.h" // Include Emon Library

EnergyMonitor emon1; // Create an instance

void setup()

{

Serial.begin(9600);

emon1.voltage(2, 234.26, 1.7); // Voltage: input pin, calibration, phase_shift

emon1.current(1, 111.1); // Current: input pin, calibration.

}

void loop()

{

emon1.calcVI(20,2000); // Calculate all. No.of wavelengths, time-out

emon1.serialprint(); // Print out all variables

}

These are the errors when I click on compile.....

voltage_and_current_ex.cpp.o: In function `loop':

C:\Users\Mark\AppData\Local\Temp\build1517359345261135376.tmp/voltage_and_current_ex.cpp:17: undefined reference to `EnergyMonitor::calcVI(int, int)'

C:\Users\Mark\AppData\Local\Temp\build1517359345261135376.tmp/voltage_and_current_ex.cpp:18: undefined reference to `EnergyMonitor::serialprint()'

voltage_and_current_ex.cpp.o: In function `setup':

C:\Users\Mark\AppData\Local\Temp\build1517359345261135376.tmp/voltage_and_current_ex.cpp:11: undefined reference to `EnergyMonitor::voltage(int, double, double)'

C:\Users\Mark\AppData\Local\Temp\build1517359345261135376.tmp/voltage_and_current_ex.cpp:12: undefined reference to `EnergyMonitor::current(int, double)'

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Re: AC Analog conversion for UNO

Submitted by markbeal2 on Sat, 21/04/2012 - 19:16.

Have I got to set anything in the Emonlib would anyone know?

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Re: AC Analog conversion for UNO

Submitted by markbeal2 on Sat, 21/04/2012 - 19:22.

In the Emonlib it says the following

private:

//Set Voltage and current input pins

int inPinV ;

int inPinI ;

//Calibration coeficients

//These need to be set in order to obtain accurate results

double VCAL;

double ICAL;

double PHASECAL;

Anyone know what I need to do here?

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Re: AC Analog conversion for UNO

Submitted by markbeal2 on Sat, 21/04/2012 - 19:45.

Is this a test? well I have failed.. someone put me out of my misery pleeeeeeeeeeeeeezzzzz.

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Re: AC Analog conversion for UNO

Submitted by Pcunha (not verified) on Wed, 25/04/2012 - 16:57.

Your sketch compiles fine.

Open arduino
Paste your code on the blank window;
open windows explorer and browse to folder where the emonlib.c and emonlib.h are;
drag emonlib.c and emonlib.h into the arduino screen, so it will have 3 open files ( your stetch, emonlib.c and emonlib.h)
upload the code.

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Re: AC Analog conversion for UNO

Submitted by markbeal2 on Wed, 25/04/2012 - 18:00.

Thanks Pcunha, It was the emonlib.c I didn't have in, when i put that in the lib folder it worked.

I'm just experimenting with a sketch that Paul Reed uses but that throws up errors, if you could try that as below.

Paul said it works ok but he used the older version of Arduino IDE.

/ Mains AC Non-Invasive Energy Monitor (2 channel)

// Last revision 27th Oct 2010

// Licence: GNU GPL

// By Trystan Lea (updated to support two channel energy monitoring by Glyn Hudson)

//--------------------------------------------------------------------------------------

// VARIABLE DECLERATION

//--------------------------------------------------------------------------------------

//--ENERGY MEASURMENT VARIABLES------------------------------

//Power measurement/time variables

unsigned long t_now, t_diff, t_last, t_culm;

//kwhTotal is cumulative kwh today.

double Solarkwh =0.0;

double Mainskwh =0.0;

//--------------------------------------------------------------------------------------

// EMON

//--------------------------------------------------------------------------------------

// include the library code:

#include <LiquidCrystal.h> // initialize the library with the numbers of the interface pins

LiquidCrystal lcd(8, 9, 10, 11, 12, 13);

int menuState = 0;

int menu = 0;

int wavelengths = 3000; //number of wavelengths to sample

int inPinV = 1; //Analog input pin number that voltage signal is connected to

int inPinI_1 = 3; //Analog input pin number that current signal is connected to. Channel 1

int inPinI_2 = 2; //Analog input pin number that current signal is connected to. Channel 2

int menupin = 1; //Arduino pin 1 goes to pushbutton for menu

int RelayOn = 4; //Arduino pin 4 goes to the opto isolator (full power)

int HRelayOn = 3; //Arduino pin 3 goes to opto isolator (half power)

int led_on = 6; //Arduino pin 6 goes to panel LED

//channel 1

double VCAL = 1.28348; //Voltage calibration scaler

double ICAL_1 = 0.05815; //Current calibration scaler

double ICAL_2 = 0.05806;

double PHASECAL = 2.3; //Shifts voltage relative to current,

//subtracting any phase shifting caused by components

int emon_timeout = 2000; //how long to wait ms if something goes wrong.

class Channel

{

public:

void emon_calc(int,double); //create pulse function

double realPower, //Output variables

apparentPower,

powerFactor,

Vrms,

Irms,

whInc,

wh;

private: // Variable declaration for emon_calc procedure

int lastSampleV,sampleV; //sample_ holds the raw analog read value, lastSample_ holds the last sample_

int lastSampleI,sampleI;

double lastFilteredV,filteredV; //Filtered_ is the raw analog value minus the DC offset

double lastFilteredI, filteredI;

double phaseShiftedV; //Holds the calibrated phase shifted voltage.

double sqV,sumV,sqI,sumI,instP,sumP; //sq = squared, sum = Sum, inst = instantaneous

int startV; //Instantaneous voltage at start of sample window.

boolean lastVCross, checkVCross; //Used to measure number of times threshold is crossed.

int crossCount; // ''

unsigned long lwhtime, whtime; //used to calculate energy used.

};

Channel ch1,ch2; //create two incidence of class channel for the two channels

//--------------------------------------------------------------------------------------

// SETUP

//--------------------------------------------------------------------------------------

void setup()

{

lcd.begin(16, 4); // set up the LCD's number of columns and rows:

Serial.begin(9600);

pinMode(RelayOn,OUTPUT); // this sets the pin named RelayOn to be an output

pinMode(HRelayOn,OUTPUT); // this sets the pin named RelayOn to be an output

pinMode(menupin, INPUT); // this sets the pin named menupin to be an input

pinMode (led_on, OUTPUT); //this sets the pin named led_on to be an output

t_culm = (3600000 * 12); //On first run, advances the 24hr timer by 12hrs (so can restart at midday!)

//t_culm = (3600000 * 23.75); //FOR TESTING ONLY

digitalWrite(RelayOn,HIGH); //Switches relay off

digitalWrite(HRelayOn,HIGH); //Switches relay off

//Introduces 15 second delay to allow caps to charge up

lcd.clear();

lcd.setCursor(0, 0);

lcd.print(" Please Wait ");

lcd.setCursor(0, 1);

lcd.print("Initialising....");

delay (15000);

}

unsigned long wtime;

//--------------------------------------------------------------------------------------

// MAIN LOOP

//--------------------------------------------------------------------------------------

void loop()

{

//-------------------------------------------------------------------------------------------

// 1) Calculate energy monitor values

//-------------------------------------------------------------------------------------------

/ch1.emon_calc(inPinI_1,ICAL_1); //Energy Monitor calc function for channel 1, pass Arduino analog in pin nummber and calibration coefficient

ch2.emon_calc(inPinI_2,ICAL_2); //Energy Monitor calc function, for channel 2, pass Arduino analog in pin nummber and calibration coefficient

//--ENERGY MEASURMENT CALCULATION----------------

//Power measurement

t_now = millis();

if ( t_now > t_last ) { //check to see if millis has overflowed back to zero (after approx 49 days)

t_diff = t_now - t_last; } //if not, the time each emon cycle takes

else { //if millis has reset...

t_diff = 4127; } //t_diff = (the amount of time each average emon cycle takes), again dealing with the millis reset.

t_culm += t_diff;

t_last = t_now;

if ( t_culm > (3600000 * 24)){ //check to see if 24hrs has elapsed

Solarkwh = 0; // RESET

Mainskwh = 0; // RESET

t_culm = 0; // RESET

}

//ch1.realPower = 2534; //FOR TESTING ONLY

//ch2.realPower = 1522; //FOR TESTING ONLY

//Calculate number of kwh generated.

Solarkwh = Solarkwh + ((ch1.realPower/1000.0) * 1.0/3600.0 * (t_diff/1000.0));

Mainskwh = Mainskwh + ((ch2.realPower/1000.0) * 1.0/3600.0 * (t_diff/1000.0));

//------------Data Output-------------

//Read menupin to see what menu to display

menuState = digitalRead(menupin);

if ( menuState == LOW) {

menu = menu+1; }

if (menu > 4){

menu = 0;

}

//MENU 0

if (menu == 0) {

// clear the lcd screen

lcd.clear();

//if-else statement to alter LCD print format depending upon power reading

lcd.setCursor(0, 0);

if (ch1.realPower >= 1000) {

lcd.print("Solar "); lcd.print(ch1.realPower / 1000.0, 3); lcd.print(" kW"); }

else {

lcd.print("Solar "); lcd.print(ch1.realPower, 0); lcd.print(" Watts"); }

lcd.setCursor(0, 1);

if (ch2.realPower >= 5000) {

lcd.print("M/Power over 5kW"); }

else

if (ch2.realPower >= 1000) {

lcd.print("Mains "); lcd.print(ch2.realPower / 1000.0, 3); lcd.print(" kW"); }

else {

lcd.print("Mains "); lcd.print(ch2.realPower, 0); lcd.print(" Watts"); }

lcd.setCursor(0, 2);

lcd.print("Voltage "); lcd.print(ch1.Vrms, 0); lcd.print(" V");

}

//MENU 1 - to enable detailed readings for calibration

if (menu == 1) {

lcd.clear();

lcd.setCursor(0, 0);

lcd.print("Solar "); lcd.print(Solarkwh); lcd.print(" kWh");

lcd.setCursor(0, 1);

lcd.print("Mains "); lcd.print(Mainskwh); lcd.print(" kWh"); }

//MENU 2 - to enable detailed readings for calibration

if (menu == 2) {

lcd.clear();

lcd.setCursor(0, 0);

lcd.print("PowerF "); lcd.print(ch1.powerFactor, 2);

lcd.setCursor(0, 1);

lcd.print("Voltage "); lcd.print(ch1.Vrms, 0); lcd.print(" V"); }

//MENU 3 - to enable detailed readings for calibration

if (menu == 3) {

lcd.clear();

lcd.setCursor(0, 0);

lcd.print("Solar "); lcd.print(ch1.realPower, 0); lcd.print(" W");

lcd.setCursor(0, 1);

lcd.print("Mains "); lcd.print(ch2.realPower, 0); lcd.print(" W"); }

//MENU 4 - DEMO MODE

if (menu == 4) {

lcd.clear();

lcd.setCursor(0, 0);

lcd.print ("Press button for");

lcd.setCursor(0, 1);

lcd.print("3 secs for demo");

delay (3000);

if (digitalRead(menupin)== LOW) { //check to see if button is still pressed

lcd.clear();

lcd.setCursor(0, 0);

lcd.print ("DEMO MODE");

delay (2000);

lcd.clear();

lcd.setCursor(0, 0);

lcd.print("Solar 1.326 kW");

lcd.setCursor(0, 1);

lcd.print("Mains 298 Watts");

digitalWrite (led_on,HIGH);

delay (10000);

lcd.clear();

lcd.setCursor(0, 0);

lcd.print("Solar 18.36 kWh");

lcd.setCursor(0, 1);

lcd.print("Mains 4.29 kWh");

digitalWrite (led_on,HIGH);

delay (10000);

lcd.clear();

lcd.setCursor(0, 0);

lcd.print("PowerF 0.98");

lcd.setCursor(0, 1);

lcd.print("Voltage 247 V");

digitalWrite (led_on,HIGH);

delay (10000);

menu = 0; }

else {

menu = 0; }

}

//checks to see if can run at full power

if (ch1.realPower > (ch2.realPower +1090)) {

digitalWrite(HRelayOn,HIGH); //turn the half power output off

digitalWrite(RelayOn,LOW); //turn the full output on

}

else{

digitalWrite(RelayOn,HIGH); //turn the output off

//checks to see if can run at half power

if (ch1.realPower > (ch2.realPower +545)) {

digitalWrite(HRelayOn,LOW); }//turn the output on

else {

digitalWrite(HRelayOn,HIGH); //turn the output off

}

//LED control

if (digitalRead(RelayOn) == LOW) {

analogWrite(led_on, 200); }

else if (digitalRead(HRelayOn) == LOW) {

analogWrite(led_on, 30); } //quarter brightness

else {

digitalWrite (led_on,HIGH);

delay (100);

digitalWrite (led_on,LOW);

}

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Re: AC Analog conversion for UNO

Submitted by Pcunha (not verified) on Sat, 28/04/2012 - 18:16.

/ch1.emon_calc(inPinI_1,ICAL_1); //Energy Monitor calc function for channel 1, pass Arduino analog in pin nummber and calibration coefficient

ch2.emon_calc(inPinI_2,ICAL_2); //Energy Monitor calc function, for channel 2, pass Arduino analog in pin nummber and calibration coefficient

You shoud remove a slash in the first line above.

You shoud add one slash at the very first line of the code, as its a comment.

It looks to me that the code is not complete. it trows an compilation error. the emon_calc funcion does not have any code.

In my opinion you shoud start with a working example at openenergymonitor github and then modify for your needs.

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Re: AC Analog conversion for UNO

Submitted by markbeal2 on Sat, 28/04/2012 - 20:35.

Thanks pcunha for the advice, I have a script that works now and have modified it to my needs. Thanks again.

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