Simple question on arrays

Using Arduino Programming Questions
#1

Hello everyone,
I am trying to program an Arduino Uno to read the analog values of 2 different NTC thermistors connected with dividers and with the analog pins of the Arduino.

  1. the Arduino takes 10 measurements with some delay between each other
  2. store each measurement in a array
  3. compare the first value stored in the array with the sum of the 10 values
  4. if the sum is the same with the 1st value, print a message
  5. when 10 measurements are completed, “clean” the array and go back to the beginning
#include <math.h>

int backLight = 13;    // pin 13 will control the backlight



void setup(void) {
  Serial.begin(9600);
  pinMode(backLight, OUTPUT);
  digitalWrite(backLight, HIGH); // turn backlight on. Replace 'HIGH' with 'LOW' to turn it off.


}

double Thermister(int RawADC) {
  double Temp;
  Temp = log(((10240000 / RawADC) - 10000));
  Temp = 1 / (0.001129148 + (0.000234125 * Temp) + (0.0000000876741 * Temp * Temp * Temp)); //calculations used for the thermistors
  Temp = Temp - 273.15;           // Convert Kelvin to Celcius
  return Temp;
}

void printTemp(void) {

  double temp = Thermister(analogRead(0));  // Read sensor
  double temp2 = Thermister(analogRead(5));

  Serial.print("\n");
  Serial.print("Temperature is:");
  Serial.print(temp);
  Serial.print("\n");
  Serial.print("Temperature2 is:");
  Serial.print(temp2);
  Serial.print(" C  ");
  double  stemp = (temp + temp2) ;
  Serial.print("\n");
  Serial.print("SUM temperature is:");
  Serial.print(stemp);
  double stfump = (stemp / 2) ;
  Serial.print("\n");
  Serial.print("AVERAGE temperature of 2 sensors is:");
  Serial.print(stfump);
  Serial.print("\n");
  Serial.print("\n");
  delay(3000);
  Serial.print(",,,,,,,,,,,,");

}

void loop(void) {
  float reading[10] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
  float summer = 0;
  float stfump = 0;

  for ( int i = 0; i = 9; i++) {
    printTemp();
    delay(1);
    reading[i] = stfump;
    summer = summer + reading[i];
  }
  
  if (summer == reading[1]) { //checking whether the sum of the array is the same with the 1st value
    Serial.print("completed measurement");
  }
}

Here is my code:

Any help is more than welcome,
Thank you in advance,

Napster

#2 
for ( int i = 0; i = 9;

Bzzzt

#3

The stfump declared in printTemp()

  Serial.print(stemp);
  double stfump = (stemp / 2) ;
  Serial.print("\n");

is not the same variable as the stfump declared in loop()

void loop(void) {
  float reading[10] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
  float summer = 0;
  float stfump = 0;

The latter one will not be updated by the printTemp() function so will always have a value of zero.
So
    reading[i] = stfump;will always store zero in the array.

#4

napster210:

  1. the Arduino takes 10 measurements with some delay between each other
  2. store each measurement in a array
  3. compare the first value stored in the array with the sum of the 10 values

Unless all the measurements after the first one are zero, I don't see how the first value could ever equal the sum of all ten values.

#5

What is unique about the "First" measurement that validates it as a comparison standard?. Better IMO to discard the outliers and average or smooth the rest.

Doc

#6