#define PIN_TO_SAMPLE A0
#define LED_PIN_OVERVOLT 2

#define SAMPLE_TIME_US 50
#define NUM_OF_SAMPLES 30
#define MAX_MEAN_MV 3000

float voltage;
float mean_voltage;
float voltage_accumulator=0;
int acq_counter=0;

void introduction_prints(){
	const float fcamp=(1.0/float(SAMPLE_TIME_US))*1000000;
	Serial.println("Welcome to our Oscilloscope project.");
	Serial.print("Sampling on pin ");
	Serial.println(PIN_TO_SAMPLE);
	Serial.print("Sampling frequency set @ ");
	Serial.print(fcamp);
	Serial.println("Hz");
}

float perform_acquisition(){
	int ADRES;
	float value_mv;		//in mV

	ADRES=analogRead(PIN_TO_SAMPLE);
  value_mv=(ADRES*(5.0/1024.0))*1000.0;	//ADC has n=10bit, FSR=5V
  return(value_mv);
}

void setup(){
	pinMode(PIN_TO_SAMPLE, INPUT);
	pinMode(LED_PIN_OVERVOLT, OUTPUT);
	Serial.begin(9600);
	introduction_prints();
	delay(4000);
}

void loop(){
	voltage=perform_acquisition();
	Serial.print("Measured voltage is: ");
	Serial.print(voltage);
	Serial.println("mV");

	voltage_accumulator=voltage_accumulator+voltage;
	acq_counter++;
	if(acq_counter==NUM_OF_SAMPLES){
		mean_voltage=voltage_accumulator/float(NUM_OF_SAMPLES);
		voltage_accumulator=0;
		acq_counter=0;
		if(mean_voltage>MAX_MEAN_MV){
			digitalWrite(LED_PIN_OVERVOLT, HIGH);
		}
		else{
			digitalWrite(LED_PIN_OVERVOLT, LOW);
		}
	}

	delayMicroseconds(SAMPLE_TIME_US);
}