arduino

#include <LiquidCrystal.h>

int sensorPin = A0;
double alpha = 0.75;
int period = 500;
double change = 0.0;
double minval = 0.0;
void setup ()
{
  Serial.begin (9600);
}
void loop ()
{
    static double oldValue = 0;
    static double oldChange = 0;

    int rawValue = analogRead (sensorPin);
    double value = alpha * oldValue + (1 - alpha) * rawValue;


    Serial.print (",");
    Serial.println (value/10);
    oldValue = value;

    delay (period);
}