#include <Wire.h>
const int sampleWindow = 50;
unsigned int sample;
const int K = 10; //Nr de LED-uri
int barPins[] = { 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }; //Pinii de iesire-led-uri
void setup()
{
    for (int i = 0; i < K; i++) {
        pinMode(barPins[i], OUTPUT); //Configurarea pinilor ca iesiri
    }
    Serial.begin(9600);
}
void loop()
{
    unsigned long startMillis = millis();
    unsigned int peakToPeak = 0;
    unsigned int signalMax = 0;
    unsigned int signalMin = 1024;
    // collect data for 50 mS
    while (millis() - startMillis < sampleWindow) {
        sample = analogRead(A0);
        if (sample < 1024) {
            if (sample > signalMax) {
                signalMax = sample;
            }
            else if (sample < signalMin) {
                signalMin = sample;
            }
        }
    }
    peakToPeak = signalMax - signalMin;
    double volts = (peakToPeak * 5.0) / 1024;
    Serial.print(peakToPeak);
    Serial.print(" ");
    Serial.println(volts);
    int level = map(peakToPeak, 0, 1023, 0, 10); // Translatarea
    // domeniului datelor de intrare in domeniul 0,10 nivele
    Serial.println(level);
    for (int i = 0; i < K; i++) {
        if (i < level) {
            digitalWrite(barPins[i], HIGH);
        }
        else {
            digitalWrite(barPins[i], LOW);
        }
    }
    delay(10);
}