Converting int into char array.

Projects Programming
10

Wrote this (untested code) before the discussion.

If I understood what you wanted to do this should do it (I believe) using less memory than any of the presented methods.

const uint8_t       pinSPEAKER          = 1;
const uint8_t       pinANALOG_SENSOR    = 2;

const unsigned long ONE_SECOND          = 1000UL;
const unsigned long TWO_SECONDS         = 2UL * ONE_SECOND;
const unsigned long THREE_SECONDS       = 3UL * ONE_SECOND;

const unsigned long TONE_TIME_ON        = 250UL;
const unsigned long TONE_TIME_OFF       = 250UL;

const unsigned long SAMPLE_DELAY        = 300UL;

const int           SAMPLE_COUNT        = 4;

void signal(const int n)
{
    for ( int i = n; i--; )
    {
        tone(1, 4500);
        delay(TONE_TIME_ON);

        noTone(1);
        delay(TONE_TIME_OFF);
    }

    delay(THREE_SECONDS);
}

void signal_number(int value)
{
    int     place;
    int     digit;
    
    if ( value < 10 )
    {
        signal(value);
    }
    else
    {
        place = value / 10;
        signal_number(place);
        
        digit = value % 10;
        signal(digit);
    }
}

void loop()
{
    int val     = 0;
    for ( int i = SAMPLE_COUNT, val = 0; i--; )
    {
        val = analogRead(pinANALOG_SENSOR);
        delay(SAMPLE_DELAY);
    }

    int average = val / SAMPLE_COUNT;
    signal_number(average);
}

void setup()
{
    pinMode(pinSPEAKER, OUTPUT);
    
    delay(THREE_SECONDS);
}