Na én valami ilyesmivel próbálkoznék. Boarodon nem próbáltam ki, csak gyorsan összedobtam. Amit bekéne állítani az a ADC_GAIN és ADC_OFFSET , Utóbbit 512-re tippelem viszont látom, hogy a modulon van valami potméter is így tipper a gain az állítható.
Ez a kód most nullát fog mindenre visszaadni amígy ADC_GAIN -t nem állítod be.

#include <Arduino.h>

#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
#define ADC_BUFFER_SIZE 20
#define ADC_PIN A0
#define ADC_OFFSET 512.0f
#define ADC_GAIN 0.0f // be kell állítani
#define RMS_GAIN 0.05f // delta_T/T

volatile uint8_t bufferIterator = 0;
volatile uint16_t ADC_BUFFER[ADC_BUFFER_SIZE];
uint16_t ADC_BUFFER_CALC[ADC_BUFFER_SIZE];
float RMS_Current;

void setup()
{
//Gergosz2 2023
Serial.begin(51200);
setupPWMInterrupt();
bufferIterator = 0;
memset(ADC_BUFFER, (uint16_t)0, ADC_BUFFER_SIZE*sizeof(uint16_t));

}

void loop()
{
if (0u == bufferIterator)
{
memcpy(ADC_BUFFER_CALC, ADC_BUFFER, ADC_BUFFER_SIZE*sizeof(uint16_t));
RMS_Current = 0.0f;
int iterator = 0;
for (iterator = 0; iterator < ADC_BUFFER_SIZE; iterator++)
{
float SI_val = (((float)ADC_BUFFER_CALC[iterator] - ADC_OFFSET)*ADC_GAIN);
RMS_Current = RMS_Current + SI_val*SI_val* RMS_GAIN;
}
RMS_Current = sqrt(RMS_Current);
Serial.println(RMS_Current);
}
}

void setupPWMInterrupt()
{

noInterrupts(); // disable all interrupts
TCCR2A = 0; // set entire TCCR2A register to 0
TCCR2B = 0; // same for TCCR2B
TCNT2 = 0; //initialize counter value to 0
// set compare match register for 1khz increments
OCR2A = 124; // = (16*10^6) / (2*1000*64) - 1 (must be <256)
TCCR2A |= (1 << WGM21); // turn on CTC mode
TCCR2B |= (1 << CS22); // Set CS01 and CS00 bits for 64 prescaler

sbi(TIMSK2, OCIE2A); // enable timer compare interrupt

interrupts(); // enable all interrupts
}

ISR(TIMER2_COMPA_vect)
{
ADC_BUFFER[bufferIterator] = analogRead(ADC_PIN);
bufferIterator ++;

if (bufferIterator > ( ADC_BUFFER_SIZE - 1u) ) bufferIterator = 0u;

}

[ Szerkesztve ]

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