I'm trying to learn/build a 3-phase system monitoring device based on Arduino Mega, which will allow the user to monitor 220V/50Hz 3-phase system voltage and current with phase sequence detection for the correct wiring order (L1, l2, l3).
I was following this project from engineer experiences and achieved good results on the hardware part (schematics and circuit from link above).
For the software I used EmonLib for voltage and current measurements. I got the correct readings from Arduino, I think I don't understand the part related to adding timers loop to the code.
This is my modified code:
#include "EmonLib.h" // Include Emon Library
EnergyMonitor emon0; // L1 Instance
EnergyMonitor emon1; // L2 Instance
EnergyMonitor emon2; // L3 Instance
int s1 = analogRead(A3);
int s2 = analogRead(A4);
int s3 = analogRead(A5);
unsigned int g=0;
int i; // For for loops
unsigned int a22;
void setup() {
Serial.begin(9600);
Serial.println("3 phase voltage");
delay(1000);
emon0.voltage(0, 225.5, 1.7); // Voltage: input pin, calibration, phase_shift
emon1.voltage(1, 225.5, 1.7); // Voltage: input pin, calibration, phase_shift
emon2.voltage(2, 225.5, 1.7); // Voltage: input pin, calibration, phase_shift
emon0.current(6, 111.1); // Current: input pin, calibration.
emon1.current(7, 111.1); // Current: input pin, calibration.
emon2.current(8, 111.1); // Current: input pin, calibration.
}
//Code Start
//Function for angle calculations
int calculations() {
unsigned int k=0;
//To complete number of counts
g=g+1;
//To convert into seconds
float pf=(float)g/1000000;
//To convert seconds into degrees
pf=pf*50*360;//here frequency = 50hz
k = pf;
return k;
}
void tloop1() {
while(1) {
if (s2 != 0) {
TCNT1=0;
TCCR1B = 0x01; // Start timer1 at Fcpu/1
break;
} else {
continue;
}
}
while(1) {
if (s3 != 0){
TCCR1B = 0x00;//stop timer1
g=TCNT1;//getting number of counts
break;
} else {
continue;
}
}
}
void tloop2() {
while(1) {
if (s3 != 0){
TCNT1=0;
TCCR1B = 0x01; // Start timer1 at Fcpu/1
break;
} else {
continue;
}
}
while(1) {
if (s1 != 0){
TCCR1B = 0x00;//stop timer1
g=TCNT1;//getting number of counts
break;
} else {
continue;
}
}
}
float fmap(float x, float in_min, float in_max, float out_min, float out_max) {
return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}
void phase1() {
unsigned int a1=0;
unsigned int v1=0;
emon0.calcVI(20,2000); // Calculate all. No.of wavelengths, time-out
float L1supplyVoltage = emon0.Vrms; //extract Vrms into Variable
float Irms0 = emon0.Irms; //extract Irms into Variable
float cablibratedi0 = 0;
Serial.print("phase 1: V = ");Serial.println(L1supplyVoltage); // Print out all variables
cablibratedi0 = fmap(Irms0, 0.0, 1024.0, 0.0, 200.0);
Serial.print("phase 1: A = ");Serial.println(cablibratedi0); // Print out all variables
a1 = calculations();
Serial.print("phase 1: D = ");Serial.println(a1);
Serial.print("Line to Next Line Voltage:");Serial.println(L1supplyVoltage * 1.732);
}
void phase2() {
tloop1();
unsigned int a2=0;
unsigned int v2=0;
delay(20);
emon1.calcVI(20,2000); // Calculate all. No.of wavelengths, time-out
float L2supplyVoltage = emon1.Vrms; //extract Vrms into Variable
float Irms1 = emon1.Irms; //extract Irms into Variable
float cablibratedi1 = 0;
Serial.print("phase 2: V = ");Serial.println(L2supplyVoltage); // Print out all variables
cablibratedi1 = fmap(Irms1, 0.0, 1024.0, 0.0, 200.0);
Serial.print("phase 2: A = ");Serial.println(cablibratedi1); // Print out all variables
a2 = calculations();
a22 = a2;
Serial.print("phase 2: D = ");Serial.println(a2);
Serial.print("Line to Next Line Voltage:");Serial.println(L2supplyVoltage * 1.732);
delay(700);
}
void phase3() {
tloop2();
unsigned int a3=0;
unsigned int v3=0;
delay(20);
emon2.calcVI(20,2000); // Calculate all. No.of wavelengths, time-out
float L3supplyVoltage = emon2.Vrms; //extract Vrms into Variable
float Irms2 = emon2.Irms; //extract Irms into Variable
float cablibratedi2 = 0;
Serial.print("phase 3: V = ");Serial.println(L3supplyVoltage); // Print out all variables
cablibratedi2 = fmap(Irms2, 0.0, 1024.0, 0.0, 200.0);
Serial.print("phase 3: A = ");Serial.println(cablibratedi2); // Print out all variables
a3 = calculations();
a3 = a22 + a3;
Serial.print("phase 3: D = ");Serial.println(a3);
Serial.print("Line to Next Line Voltage:");Serial.println(L3supplyVoltage * 1.732);
}
void loop() {
phase1();
phase2();
phase3();
delay(1000);
}
Code compiles with no errors, but when I open serial monitor from Arduino IDE only phase1(); gets to run and displayed once.
int s1 = analogRead(A3);
int s2 = analogRead(A4);
int s3 = analogRead(A5);
Don't try to read pins outside of functions. It won't work. The variables will be initialized as 0. Which means that your code will get stuck in a while loop.
What you need to do is:
int s1;
int s2;
int s3;
[...]
void setup() {
s1 = analogRead(A3);
s2 = analogRead(A4);
s3 = analogRead(A5);