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float reading; 
int i = 0;
float avg = 0;
float tot = 0;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  delay(100);
  Serial.println("===========");
}

void loop() {
  reading = analogRead(7);
  i+=1;
  tot = tot + reading;
  avg = tot / i;
  Serial.println(avg);
  delay(10);

}