const int sensorPin = A0;
int analogValue;

void setup() {
  Serial.begin(9600);
  pinMode(sensorPin, INPUT);
  Serial.println("Plotting ZMPT101B waveform...");
}

void loop() {
  analogValue = analogRead(sensorPin);
  
  // Convert to voltage (for 5V Arduino ADC)
  float voltage = (analogValue * 5.0) / 1023.0;

  // Print the voltage for plotting
 Serial.print(voltage, 2); // 2 decimal places
  Serial.println(" V");
  

  // Small delay to stabilize sampling
  delay(500); // Adjust for smoother/faster waveform
}
								
							
							

	
								
// ZMPT101B AC Voltage Measurement
const int sensorPin = A0;               // Analog pin connected to ZMPT101B output
const int sampleCount = 1000;           // Number of samples for RMS calculation
float calibrationFactor = 0.45;         // Adjust this value to match real voltage

void setup() {
  Serial.begin(9600);
  analogReference(DEFAULT); // Uses 5V as reference on Arduino Uno
  delay(1000);
}

void loop() {
  long sumOfSquares = 0;
  
  for (int i = 0; i < sampleCount; i++) {
    int raw = analogRead(sensorPin);   // Read raw ADC value (0 to 1023)
    int centered = raw - 512;          // Center around 0 (assuming VCC/2 baseline)
    sumOfSquares += (long)(centered * centered);
    delayMicroseconds(100);           // Sampling delay (~10kHz sample rate)
  }

  // Calculate RMS value
  float mean = sumOfSquares / (float)sampleCount;
  float rms = sqrt(mean);

  // Convert to actual AC voltage using calibration factor
  float voltage = rms * calibrationFactor;

  Serial.print("AC Voltage (RMS): ");
  Serial.print(voltage);
  Serial.println(" V");

  delay(1000); // Update every second
}