Energy monitor with acs712_5a

Projects General Guidance
1

my project is lowest energy consumption in circuit, now I want to monitor power usage in circuit but I got a big problem.

when the sensor get data from sensor and send to server via esp8266-01(wifi module)
amp value is around 90-100 ma

my code make IC sleep(sleep.h) after data is sent to server, now problem occur
amp value is around 110-130 ma

my question
1.why amp value when sleep is more than amp value when get data from sensor?

2.I can use follow equation or not?
amp when sleep - amp when doing = energy reduced
130 - 100 = 30 ma (30 ma energy reduced)

help me please :slight_smile:
see the picture
v
v
v

Untitled.png

2

help me please :slight_smile:
see the picture

Help me please
post your code :slight_smile:

3

UKHeliBob:
Help me please
post your code :slight_smile:

my sensor code

void loop() {
wifiModuleControl();// this method is get sensor data and send to server

delay(500);
Serial.println("sleep z Z Z ");

delay(2000);
for(sleepLoop = 0; sleepLoop < 75; sleepLoop++){
Serial.println("sleep " + String(sleepLoop));
delay(100);
ADCSRA = 0;
MCUSR = 0;
WDTCSR = bit (WDCE) | bit (WDE);
WDTCSR = bit (WDIE) | bit (WDP3) | bit (WDP0);
wdt_reset();

set_sleep_mode (SLEEP_MODE_PWR_DOWN);
noInterrupts ();
sleep_enable();

MCUCR = bit (BODS) | bit (BODSE);
MCUCR = bit (BODS);
interrupts ();
sleep_cpu ();

sleep_disable();
}
}

ISR (WDT_vect)
{
wdt_disable();
}

////////////////////////////////////////////////////////////////////////////////////////
my current monitor code

float testCurrentCal(){//not compare value to meter
const int analogIn = A0;
int mVperAmp = 185; // use 100 for 20A Module and 66 for 30A Module
int RawValue= 0;
int ACSoffset = 2500;
double Voltage = 0;
double Amps = 0;

for(int i = 0; i < 1000; i++) {
// 0-5 = 0-1023 // vIn/analogIn = 5/1023
RawValue = RawValue+analogRead(analogIn);
delay(1);
}
RawValue=RawValue/1000.0+15.0; // +15 make default value = 0
Voltage = (RawValue / 1023.0) * 5000; // Gets you mV
Amps = ((Voltage - ACSoffset) / mVperAmp)+13.514; // +13.514 make deafult value =0

Serial.print("Raw Value = " ); // shows pre-scaled value
Serial.print(RawValue);
Serial.print("\t mV = "); // shows the voltage measured
Serial.print(Voltage,3); // the '3' after voltage allows you to display 3 digits after decimal point
Serial.print("\t Amps = "); // shows the voltage measured
Serial.println(Amps,3); // the '3' after voltage allows you to display 3 digits after decimal point
delay(100);
}

4

Can you please post your whole program, not just part of it, and when you do use code tags (far left icon above the editor) to make it more manageable

5

int rawValue = 0;
That can hold a maximum of 32767

for(int i = 0; i < 1000; i++) reads the A/D 1000 times
That could be 1023000

rawValue is likely overflowing.

Use:

unsigned long rawValue = 0;

Leo..