#include <Arduino.h>

const int lm35_pin = 34; /* LM35 O/P pin */

#define ADC_VREF_mV 3300.0 // in millivolt
#define ADC_RESOLUTION 4096.0

#define FILTER_LEN 15

uint32_t AN_Pot1_Buffer[FILTER_LEN] = {0};

float readADC_Avg(int pin)
{
    float avg = analogRead(pin);
    for (int i = 0; i < 10; i++)
    {
        avg = (avg + analogRead(pin)) / 2;
        delay(20);
    }
    return avg;
}

void setup()
{
    Serial.begin(115200);
    pinMode(lm35_pin, INPUT);

    analogSetClockDiv(255);
}

void loop()
{
    float analogValue = readADC_Avg(lm35_pin);
    float millivolts = analogValue * (ADC_VREF_mV / ADC_RESOLUTION) * 2;
    // float millivolts = analogReadMilliVolts(lm35_pin);
    float celsius = millivolts / 10; // 6.5 is the callibration offset measured using an oscilliscope
    Serial.print("raw= ");
    Serial.print(analogValue);
    Serial.print(" in DegreeC= ");
    Serial.println(celsius);
    delay(1000);
}