Arduino Temperature Alarm and bar LED script

tempAlarm.c

#include <math.h>

float tempRaw, tempAvg;
uint8_t tempPin = 7;
uint8_t speakerPin = 2;

uint8_t barLedPins[] = { 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 };
uint8_t barLedPinsLength = sizeof(barLedPins) / sizeof(barLedPins[0]);

uint8_t lowTempLimit = 24;
uint8_t highTempLimit = 36;
uint8_t tempDisplayRange = highTempLimit - lowTempLimit;

float tempDiffPerLed = tempDisplayRange / barLedPinsLength;

float tempArray[10];
uint8_t tempArrayLength = sizeof(tempArray) / sizeof(tempArray[0]);

uint8_t noOfLedsToActivate;

uint8_t wPos = 0;

void setup()
{
    analogReference(INTERNAL);

    printSerialDebug();

    // Initialize tempreature average array with nil values
    for (uint8_t i =0; i < tempArrayLength; i++)
    {
        tempArray[i] = -300.0;
    }

    // Set Output mode for LEDs
    for (uint8_t i = 0; i < barLedPinsLength; i++)
    {
        pinMode(barLedPins[i], OUTPUT);
    }

}

void loop()
{
    // Get new measurement
    tempRaw = analogRead(tempPin) / 9.31;
    tempAvg = pushNewValueAndGetAverage(tempArray, tempRaw, tempArrayLength);
    noOfLedsToActivate = (uint8_t) (roundf(tempAvg - lowTempLimit) / tempDiffPerLed);
    Serial.print("Raw: ");
    Serial.print(tempRaw);
    Serial.print(" -- Avg: ");
    Serial.print(tempAvg);
    Serial.print(" -- LEDs: ");
    Serial.print(noOfLedsToActivate);
    Serial.print("\n");

    // Activate bar LEDs
    digitalWrite(barLedPins[noOfLedsToActivate], HIGH);

    if (tempAvg > highTempLimit)
    {
        analogWrite(speakerPin,500);
        delay(1000);
        analogWrite(speakerPin,0);
    }

    delay(100);

    digitalWrite(barLedPins[noOfLedsToActivate], LOW);

}

void printSerialDebug()
{
    Serial.begin(9600);
    Serial.print("High Temp: ");
    Serial.print(highTempLimit);
    Serial.print(" -- Low Temp: ");
    Serial.print(lowTempLimit);
    Serial.print(" -- Diff: ");
    Serial.print(tempDisplayRange);
    Serial.print(" -- Diff per LED: ");
    Serial.print(tempDiffPerLed);
    Serial.print("\n");
}

float pushNewValueAndGetAverage(float *array, float newVal, uint8_t arrSize)
{
    // Insert new value
    array[wPos] = newVal;
    
    // Increment next writing position with wraparound
    wPos = (wPos+1) % arrSize;
  
    float sum = 0.0;
    uint8_t validValues = 0;
  
    // Calculate average value
    for (uint8_t i = 0; i < arrSize; i++)
    {
        if (array[i] != -300.0)
        {
            validValues++;
            sum = sum + array[i];
        }
    }

    return sum/validValues;
}