In my code i am using current sensor to measure the load attached to the sensor. After switchoff the load the system resetting. LCD Display also fluctuating. here is my sketch.
float current=0;
const int currentPin = A0;
const unsigned long sampleTime = 100000UL; // sample over 100ms, it is an exact number of cycles for both 50Hz and 60Hz mains
const unsigned long numSamples = 250UL; // choose the number of samples to divide sampleTime exactly, but low enough for the ADC to keep up
const unsigned long sampleInterval = sampleTime/numSamples; // the sampling interval, must be longer than then ADC conversion time
const int adc_zero = 510; // relative digital zero of the arudino input from ACS712 (could make this a variable and auto-adjust it)
void setup()
{
Serial.begin(9600);
}
void loop()
{
CurrentSense();
Serial.println(current);
delay(1000);
}
void CurrentSense()
{
unsigned long currentAcc = 0;
unsigned int count = 0;
unsigned long prevMicros = micros() - sampleInterval ;
while (count < numSamples)
{
if (micros() - prevMicros >= sampleInterval)
{
int adc_raw = analogRead(currentPin) - adc_zero;
currentAcc += (unsigned long)(adc_raw * adc_raw);
++count;
prevMicros += sampleInterval;
}
}
float rms = sqrt((float)currentAcc/(float)numSamples) * (50 / 1024.0);
rms=rms-0.10;
if (rms<0.20)
{
rms=0;
}
current=rms;
}
