// Arduino Uno/Nano Test of ADC sampling, showing DC V and AC p-p V and sample rate.
// Over a 100ms sample period.
// Base code generated by ChatGPT, unverified in reality
// see definitions for pins used for ADC.
//===========================================================================

const int acPin = A0; // AC voltage connected to A0 (via voltage divider?)
const int dcPin = A1; // DC voltage connected to A1 (via voltage divider?)
const float acDividerRatio = 1; // AC voltage divider ratio
const float dcDividerRatio = 1; // DC voltage divider ratio
const float referenceVolt = 5.0; // Reference voltage for Arduino ADC
const int sampleTime = 100; // Sample time in milliseconds
int test_parameters[7] = {1, 2, 3, 4, 5, 6, 7};
int dut1[5][8] = { 
  {0, 1, 2, 3, 4, 5, 6, 7},
  {1, 97, 109, 121, 92, 64, 245, 101},
  {2, 98, 110, 122, 124, 36, 241, 119},
  {3, 99, 111, 43, 60, 38, 49, 114},
  {4, 100, 112, 45, 62, 39, 50, 97}
  };

void setup() {
  Serial.begin(115200);
  
  
}

void loop() {
  unsigned long startTime = millis();
  float acMin = referenceVolt;
  float acMax = 0;
  float sumOfSquares = 0;
  float acPeakToPeak, acRMS, dcRMS;
  int sampleCount = 0, sampleRate;

//----------------------------------------------------------------------
  // Start ADC sampling for sampleTime period
  while (millis() - startTime < sampleTime) {
    float acRead = analogRead(acPin) * (referenceVolt / 1023.0);
    float dcRead = analogRead(dcPin) * (referenceVolt / 1023.0);

    // Adjust the read values based on your voltage dividers
    acRead = (acRead - 0) / acDividerRatio; // Remove DC bias and scale
    dcRead = dcRead / dcDividerRatio; // Scale

    // Find minimum and maximum values for AC
    if (acRead < acMin) {
      acMin = acRead;
    }
    if (acRead > acMax) {
      acMax = acRead;
    }

    // Sum the squares of the DC values
    sumOfSquares += dcRead * dcRead;
    sampleCount++;
  }
//--------------------------------------------------------------------

  // Calculate peak-to-peak voltage for AC
  acPeakToPeak = acMax - acMin;

  // Convert peak-to-peak to RMS for AC
  //acRMS = acPeakToPeak / (2 * sqrt(2)); // Only valid for sinusoidal waveforms

  // Calculate RMS for DC
  dcRMS = sqrt(sumOfSquares / sampleCount);
  
  // Calculate sample rate
  sampleRate = 1000 / sampleTime * sampleCount; // Samples per Second (S/Sec)

  // Print the results
  Serial.print("DC RMS Volts = ");
  Serial.print(dcRMS);
  Serial.print("v : ");

  Serial.print("AC P-P Volts = ");
  Serial.print(acPeakToPeak);
  Serial.print("v : ");

  //Serial.print("AC RMS Volts = ");
  //Serial.print(acRMS);
  //Serial.println("v");

  Serial.print("Sample rate = ");
  Serial.print(sampleRate);
  //Serial.print(dut1[2][6]); // 0 is first index
  //Serial.print(test_parameters[6]);// 0 is first index
  Serial.println(" S/Sec");

 
  // Wait a bit before next measurement
  delay(1000);
}