Arduino Variables-please help ASAP

Projects Programming
1

Hey,

I am working on a project and I need to declare a global variable within a function or scope whatever you would like to call it. Another way that I could do it is by writing the code inside the same loop function but i would need to pause the looping property of the function temporarily for a certain section in the code. the purpose I need this is to have the code run a calibration by taking all of the average of the sensor reads and setting a threshold +10 of the average.
Your help is much appreciated,
Thanks in advance,
-Jack Gabbay

int led = 8;
int volume;

void setup() {

Serial.begin(9600);
pinMode(led, OUTPUT);

int t1 = analogRead(A0);
delay(10);
int t2 = analogRead(A0);
delay(10);
int t3 = analogRead(A0);
delay(10);
int t4 = analogRead(A0);
delay(10);
int t5 = analogRead(A0);
delay(10);
int t6 = analogRead(A0);
delay(10);
int t7 = analogRead(A0);
delay(10);
int t8 = analogRead(A0);
delay(10);
int t9 = analogRead(A0);
delay(10);
int t10 = analogRead(A0);
delay(10);
int t11 = analogRead(A0);
delay(10);
int t12 = analogRead(A0);
delay(10);
int t13 = analogRead(A0);
delay(10);
int t14 = analogRead(A0);
delay(10);
int t15 = analogRead(A0);
delay(10);
int t16 = analogRead(A0);
delay(10);
int t17 = analogRead(A0);
delay(10);
int t18 = analogRead(A0);
delay(10);
int t19 = analogRead(A0);
delay(10);
int t20 = analogRead(A0);
delay(10);

int total = t1 + t2 + t3 + t4 + t5 + t6 + t6 + t7 + t8 + t9 + t10 + t11 + t12 +t13 + t14 + t15 + t16 + t17 + t18 + t19 + t20;
int average = total / 20;
int newTotal = average + 10;
int threshold = newTotal;

}
}
void loop() {

volume = analogRead(A0);

Serial.print(volume);
delay(10);
if(volume>threshold){
digitalWrite(led, HIGH);
}
else{
digitalWrite(led, LOW);

}

}

sketch_apr27a.ino (1.24 KB)

3

You don't even need arrays - a single int would suffice.

Please use code tags when posting code.

4 
long total = 0;
void setup ()
  {
  for (int i = 0; i < 20; i++)
    {
    total += analogRead (A0);
    delay (10);
    }    
  // calculate average
  }

Doesn't that look a lot easier?

Arduino Variables ...

They aren't Arduino variables, they are C++ variables. Any C++ tutorial will help you out.