Using IF with smoothing code.

i have question regarding following smoothing code downloaded site , works fine:

question: how can use code:

int userinput=serial.read();
if (userinput=='1' )

functionality:

1) user types "1"
2) loop runs 10 times, averaging out values @ a0
3) serial prints average of 10 measured values
4) stops until user types in "1" again.

many help!
kind regards,
hanss
zurich






/*

  smoothing

  reads repeatedly analog input, calculating running average
  , printing computer.  keeps ten readings in array ,
  continually averages them.
 
  circuit:
    * analog sensor (potentiometer do) attached analog input 0

  created 22 april 2007
  david a. mellis  <dam@mellis.org>
  modified 9 apr 2012
  tom igoe
  http://www.arduino.cc/en/tutorial/smoothing
 
  example code in public domain.


*/


// define number of samples keep track of.  higher number,
// more readings smoothed, slower output will
// respond input.  using constant rather normal variable lets
// use value determine size of readings array.
const int numreadings = 10;

int readings[numreadings];      // readings analog input
int index = 0;                  // index of current reading
int total = 0;                  // running total
int average = 0;                // average

int inputpin = a0;

void setup()
{
  // initialize serial communication computer:
  serial.begin(9600);                   
  // initialize readings 0:
  (int thisreading = 0; thisreading < numreadings; thisreading++)
    readings[thisreading] = 0;         
}

void loop() {
  // subtract last reading:
  total= total - readings[index];         
  // read sensor: 
  readings[index] = analogread(inputpin);
  // add reading total:
  total= total + readings[index];       
  // advance next position in array: 
  index = index + 1;                   

  // if we're @ end of array...
  if (index >= numreadings)             
    // ...wrap around beginning:
    index = 0;                           

  // calculate average:
  average = total / numreadings;         
  // send computer ascii digits
  serial.println(average);   
  delay(1);        // delay in between reads stability           
}

turn smoothing code function can called when required this

code: [select]

initialise variables
setup input pin , serial port

start of loop
  if serial input available
    read 1 byte serial
    if byte matches '1'
      call averaging_function
    end of if
  end of if
end of loop

void averaging_function
  code read analog input 10 times , add total
  calculate average of readings
  print average
end of function


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