I need this code to run for 5 seconds only but I am not sure how to to do that

Projects Programming
1

// Variables for Measured Voltage and Calculated Current
double Vout = 0;
double Current = 0;

// Constants for Scale Factor
// Use one that matches your version of ACS712

const double scale_factor = 0.2; // 5A
//const double scale_factor = 0.1; // 20A
//const double scale_factor = 0.066; // 30A

// Constants for A/D converter resolution
// Arduino has 10-bit ADC, so 1024 possible values
// Reference voltage is 5V if not using AREF external reference
// Zero point is half of Reference Voltage

const double vRef = 5.00;
const double resConvert = 1024;
double resADC = vRef/resConvert;
double zeroPoint = vRef/2;
unsigned long StartTime = millis();

void setup(){
Serial.begin(9600);

}

void loop(){

// Vout is read 1000 Times for precision
for(int i = 0; i < 1000; i++) {
Vout = (Vout + (resADC * analogRead(A0)));
Vout -= 2.78;
delay(1);
}

// Get Vout in mv
Vout = Vout /1000;

// Convert Vout into Current using Scale Factor
Current = (Vout - zeroPoint)/ scale_factor;
Current +=12.51;
Current -=.13;
unsigned long CurrentTime = millis();
unsigned long ElapsedTime = CurrentTime - StartTime;
// Print Vout and Current to two Current = ");

Serial.print("Vout = ");
Serial.print(Vout,2);
Serial.print(" milliVolts");
Serial.print("\t Current = ");
Serial.print(Current,2);
Serial.println(" milliAmps");

delay(1000);

}Preformatted text

2

Please post your code properly by highlighting your code and hitting the </> button above the posting area.

Do you want loop() to execute for 5 seconds and then just stop until you reset the Arduino? Please be clear.

3

Put all your code in a function. Then use a millis timer eg

StartTimer

If currentMillis-StartTimer > 5000
Flag a bool eg TimesUp = true

If timesUp is false
myCodeFunction ()

All my code is pseudocode to point in a direction, fill in the blanks. Read the guide to this forum posted at the top of every section to get the best help

1 Like
4

a naive approach

// Variables for Measured Voltage and Calculated Current
double Vout = 0;
double Current = 0;

// Constants for Scale Factor
// Use one that matches your version of ACS712

const double scale_factor = 0.2; // 5A
//const double scale_factor = 0.1; // 20A
//const double scale_factor = 0.066; // 30A

// Constants for A/D converter resolution
// Arduino has 10-bit ADC, so 1024 possible values
// Reference voltage is 5V if not using AREF external reference
// Zero point is half of Reference Voltage

const double vRef = 5.00;
const double resConvert = 1024;
double resADC = vRef/resConvert;
double zeroPoint = vRef/2;
unsigned long StartTime = millis();

int cnt = 5;

void setup(){
    Serial.begin(9600);

}

void sample () {
    // Vout is read 1000 Times for precision
    for(int i = 0; i < 1000; i++) {
        Vout = (Vout + (resADC * analogRead(A0)));
        Vout -= 2.78;
        delay(1);
    }

    // Get Vout in mv
    Vout = Vout /1000;

    // Convert Vout into Current using Scale Factor
    Current = (Vout - zeroPoint)/ scale_factor;
    Current +=12.51;
    Current -=.13;

    // Print Vout and Current to two Current = ");
    Serial.print("Vout = ");
    Serial.print(Vout,2);
    Serial.print(" milliVolts");
    Serial.print("\t Current = ");
    Serial.print(Current,2);
    Serial.println(" milliAmps");
}

void loop() {
    if (0 < cnt)  {
        cnt --;

        sample ();
        delay(1000);
    }
}
1 Like
5

If I wanted to calculated the average current from the total values as well during the five seconds. Would I have to initialize and then add towards the end?

6

unclear what you're trying to do.

should Vout be initialized to zero before

do you want to average the average?

7

When the code stops running after 5 seconds, I want the average of the total current measured.

8

is there any need to calculate an average after each sub-sec iteration? why not accumulate all the measurements and calculate a final average when the cnt reaches zero

9

Thats what I want to do is to calculate the final average.

I want to calculate the average current at the end
10

what am i confused about?

11

Maybe I am confused, so If I wanted to get the average current from the entire run what should I do?
so if i get current = .03 .02 . .01 .05 .06

How can I get the average from those numbers?

12

add them together and divide by the # of values

13

....ok

14

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